DRAFT UGANDA STANDARD ON PUBLIC REVIEW      DRAFT UGANDA 
STANDARD  
    DUS EAS 358 
First  Edition  
2015-mm-dd 
 
 Reference number  
   DUS EAS 358: 2004 
© UNBS 201 5 
  
Pneumatic tyres for passenger cars — Specification  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWDUS EAS 358:20 04 
ii                © UNBS 2015 - All rights reserved 
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2015 
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS. 
Requests for permission to reproduce this document should be addressed to 
The Executive Director 
Uganda National Bureau of Standards 
P.O. Box 6329 
Kampala 
Uganda 
Tel: 256 41 505 995 
Fax: 256 41 286 123 
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEW   DUS EAS 358:20 04 
© UNBS  2015 - All rights reserved                iii National foreword 
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and 
Cooperatives established under Cap 327, of the Laws of Uganda, as amended.  UNBS is mandated to co-
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO). 
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of representatives of 
consumers, traders, academicians, manufacturers, government and other stakeholders. 
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
This Draft Uganda Standard, DUS EAS 358: 2004 , Pneumatic tyres for passenger cars — 
Specification , is identi cal with  and has been reproduced from an East African  Standard , EAS 358: 2004 , 
Pneumatic tyres for passenger cars — Specification , and is being proposed for adoption  as a Uganda 
Standard.  
This standard cancels and replaces US 513:2004, Specification for new pneumatic tyres — Passenger cars . 
This Uganda Standard, DUS EAS 358: 2004 , has been developed by the Transport and communication 
standards Technical Committee (UNBS/TC 8).  
Wherever the words, “ East African Standard" appear, they should be replaced by "Uganda Standard." 
 
  DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004 
ICS 83.160.10 
HS 4011.20 
HS 4011.20.10 (radial) 
 HS 4011.20.90 (other) 
© EAC 2004                                                                                                      First Edition 2 004  
 
 
 
 
EAST AFRICAN STANDARD 
 
Pneumatic tyres for passeng er cars — Specification 
  
  
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
  
 
 
 
  
 
 
EAST AFRICAN COMMUNITY 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
ii                                                                                                © EAC 2004 — All rights reser ved  
 
Foreword 
 
Development of the East African Standards has been necessitated by the need for harmonizing 
requirements governing quality of products and services in East Africa. It is envisaged that through 
harmonized standardization, trade barriers which are encountered when goods and services are 
exchanged within the Community will be removed.  
In order to achieve this objective, the Partner States in the Community through their National Bureaux 
of Standards, have established an East African Standards Committee.  
The committee is composed of representatives of the National Standards Bodies in Partner States, 
together with the representatives from the private sectors and consumer organizations. Draft East 
African Standards are circulated to stakeholders through the National Standards Bodies in the Partner 
States. The comments received are discussed and incorporated before finalization of standards, in accordance with the procedures of the Community.  
East African Standards are subject to review, to keep pace with technological advances. Users of the 
East African Standards are therefore expected to ensure that they always have the latest versions of the standards they are implementing.  
 
© East African Community 2004 — All rights reserved
* 
East African Community  P O Box 1096  
Arusha  
Tanzania  Tel: 255 27 2504253/8 Fax: 255-27-2504481/2504255 
E-Mail: eac@eachq.org Web: www.each.int 
 
  
                                                
 
* © 2004 EAC — All rights of exploitation in any form and by any means reserved worldwide for EAC Partner States’ NSBs.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                iii  
Introduction  
 
This East African Standardhas been prepared in order to give the necessary specifications and 
requirements for test of pneumatic tyres.  It provides important information to be observed for 
improvement of motor vehicle safety in the country. 
 In reporting the results of a test made in accordance with this Tanzania Standard, if the final value 
observed or calculated is to be rounded off unless otherwise explained, it shall be done in accordance 
with EAS 124 (see clause 2).  
In the preparation of this East African Standard, assistance was derived from: 
 
BS AU 50-1.1.1b:1996, 
Tyres and wheels ⎯ Car tyres ⎯ Specification for metric series tyres; 
published by the British Standards Institution. 
 
IS 10914-30:1991, Automotive vehicles ⎯ Pneumatic tyres  ⎯ Diagonal ply ⎯ Specification ⎯ 
passenger car tyres; published by the Bureau of Indian Standards. 
 
Some company standards from our regional industries.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
iv                                                                                                © EAC 2004 — All rights reserved Contents 
 
1 Scope ........................................................................................................................ ................................... 1 
2 References ................................................................................................................... ................................ 1 
3 Application.................................................................................................................. .................................. 1 
4 Terminology.................................................................................................................. ................................ 1 
5 Tyre designation............................................................................................................. .............................. 2 
6 Marking...................................................................................................................... ................................... 6 
7 Tyre dimensions .............................................................................................................. ............................. 7 
8 Tyre dimension presentation.................................................................................................. ...................... 9 
9 Test requirements ............................................................................................................ ............................ 9 
10 Nonconforming tyres ......................................................................................................... ......................... 13 
Annex A (normative)  Guideline values for tyres (metric series) ................................................................ ............. 14 
Annex B (normative)  Load capacity indices for passenger car tyres ............................................................. ........ 19 
Annex C (informative)  Marking of radial tyres designed for vehicle with maximum speeds above 210 km/h ....... 26 
 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEW                                                                                                                  
EAST AFRICAN STANDARD                                          EAS 358:2004 
                                                                                                                                     
 
© EAC 2004 — All rights reserved                                                                                                  1 Pneumatic tyres for passenger cars ⎯ Specification 
 
 
1 Scope 
 
This East African Standard specifies tyre dimensions designation and marking requirements; and load 
ratings. It also gives laboratory test requirements for bead unseating resistance, strength, endurance 
and high-speed performance for tyres primarily intended for passengers.  
 
2 References 
 
This East African Standard makes reference to the following documents: 
 
EAS 124, Rounding off numerical values 
 
EAS 53 , Tyre reconditioning ⎯ Specification   
 
3 Application 
 
This East African Standard applies to new pneumatic tyres for use on passenger cars. It does not 
apply to any tyre which has been reconditioned; or to any tyre which has been altered so as to render 
impossible its use, or its repair for use, as motor vehicle equipment. 
 
4 Terminology  
  
For the purpose of this East African Standard, the definitions given in EAS 53 and the following, shall 
apply:  
4.1 
carcass  
The tyres structure, except tread and sidewall rubber.  
4.2 chunking 
The breaking away of pieces of the tread or sidewall. 
 
4.3 
cracking 
The parting with the tread, sidewall or innerliner of the tyre extending to cord material.  
4.4 CT 
A pneumatic tyre with inverted flange tyre and rim system in which the rim is designed with rim 
flanges pointed radically inward and the tyre is designed to fit on the underside of the rim in a manner that enclosed the rim flanges inside the air cavity of the tyre.  
 
4.5 groove 
The space between two adjacent tread ribs. 
 
4.6 
nnerliner 
The layer(s) forming the inside surface of a tubeless tyre that contains the inflating medium within the 
tyre. DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
2                                                                                                © EAC 2004 — All rights reserv ed  
4.7 
innerliner separation 
The parting of the innerliner form the cord material in the carcass. 
 4.8 
load rating 
(Index) the maximum load of a tyre rated to carry for a given inflation pressure. 
 
4.9 
ply rating 
An index of casing strength, and does not necessarily represent the number of cord plies in a tyre.  With modern cords such as rayon, nylon and even steel cords, which are much stronger than the 
cotton or canvas cords which were originally used; the ply rating indicated on the tyre in usually higher 
than the actual number of plies used in tyre construction.  
4.10 maximum permissible inflation pressure 
The maximum cold inflation pressure to which a tyre may be inflated.  It does not include any pressure 
build-up due to tyre usage. 
 
4.11 
maximum load rating 
The load rating at the maximum inflation pressure for that tyre. 
 4.12 
open splice 
Any parting at any junction of the tread, sidewall, or innerliner that extends to cord material. 
 4.13 overall width 
The linear distance between the exteriors of the sidewalls of an inflated tyre, including elevations due 
to labeling, decorations or protective bands or ribs. 
 4.14 
rim 
The metal support for a tyre or a tyre and tube assembly upon which the tyre beads are seated. 
 4.15 
test rim 
With reference to a tyre to be tested, any rim that is listed as appropriate for use with that tyre in any standard tyre-and-rim matching information. 
 4.16 
tread rib 
A tread section running circumferentially around a tyre. 
 
5 Tyre designation 
 
5.1 Size and construction 
 Each tyre shall have one size designation in metric, except that equivalent inch size designations may be used. 
 
The characteristics shall be indicated as follows. 
  Nominal  /  Nominal   Tyre     Nominal 
  Section  /   aspect     construction    rim    
               Width   /   ratio    code     code  DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                3  
5.1.1 Nominal section width  
 
The nominal section width of the tyre shall be indicate d in millimetres, ending either in 0 or 5, so that 
in any one series of tyres with the same nominal aspect ratio, the values shall all end with 0 or end 
with 5. An equivalent marking in inch is permitted. 
 
For sizes mounted on 5° tapered (code-designated) rims, the nominal section width shall end with 5.  
5.1.2 Nominal aspect ratio 
 The nominal aspect ratio shall be expressed as a percentage and shall be a multiple of 5. 
 
5.1.3 Type construction code 
 
The tyre construction code shall be as follows: 
 
B for bias-belted construction 
D for diagonal construction  
R for radial ply construction  
 
NOTE Radial tyre designated for some existing vehicle with maximum speed capabilities in excess of 210 km/ h or 240 km/h 
may be designated and marked differently. See Annex C.  
In the case of tyres designed fo r vehicles   having a maximum s peed capability in excess of 240 km/h, 
the code letters “ ZR” may be indicated in the dimensional and constructional characteristics for radial 
ply tryes in pace of the tyre construction code “ R”. 
 
For speeds in excess of 300km/h, the tyres shall be marked with the code-letters “ ZR”. 
 
5.1.4 Nominal rim diameter code 
 
For tyres mounted on 5° tapered (code-designated) rims, the code shall be as given in  
Table 1.  
For tyres requiring new concept rims, for safety reasons especially concerning mounting, the code 
number shall be equal to the nominal rim diameter (
Dr) expressed as a whole number of millimetres. 
 
Table 1 ⎯ Nominal rim diameter code 
 
Nominal rim diameter code Nominal rim diameter, Dr mm  
10  254  
12  305  
13  330  
14  356  
15  381  
16  406  
17  432  
18  457  
19  483  
20  508  
 
5.2 Service description  
 
The service description shall be indicated as follows:   
 
5.2.1 Load index speed symbol 
 
For the  special case of tyres designed for vehicles having a maximum speed capability more than 300 
km/h, the indication of the service description is not required.  For the maximum speed capability and 
the load capacity of the tyres, the tyre manufacturer concerned shall be consulted. 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
4                                                                                                © EAC 2004 — All rights reserv ed 5.2.2 Load Index 
 
The maximum tyre load capacity corresponding to the service conditions specified by the tyre 
manufacturer shall be indicated by a load index taken form Table 2. This indication is understood to 
be per tyre for a single mounting. Guidelines for load capacities for passenger car tyres are given in Annex B. 
 
5.2.3 Speed symbol 
 
The speed  category is assigned to a tyre to denote the maximum speed for which use of the tyre is 
rated. The speed symbol shall be indicated by a letter taken form Table 3 corresponding to the speed 
category.  
 
5.2.4 Maximum inflation pressure 
 Operating cold inflation pressures should be agreed between tyre and vehicle manufacturers taking 
into account not only the tyre load carrying capacity, but also the operating conditions, the maximum 
speed, the position of the tyre on the vehicle, service conditions and construction and characteristics of the vehicle. 
 
Unless otherwise specified by the tyre manufacturer, it is recommended to limit  the cold inflation pressure of the radial ply tyres in normal application to 350 kPa for all standard load version sizes on 
code designated rims irrespective of the  speed symbol. 
  Other choices of pressure specifications may be 240, 280, 290, 300, 330, 340 and 390 kPa. The 
marking shall be followed in parenthesis by the equivalent inflation pressure in psi, rounded to the 
next higher whole number. The vice versa marking is also permitted. 
 
5.3 Other service characteristics   
 
5.3.1 The word “TUBELESS” shall appear on the tyres that can be used without a tube.  
 
5.3.2 The letter “T” immediately in front of the tyre size designation shall be used to characterize 
high pressure special temporary use spare tyres. 
 5.3.3 
A tread wear indicator shall be incorporated, that will provide a visual indication that the tyre 
has worn to a tread depth of 1.6 mm. 
 
5.3.4 The generic name of each cord material used in the plies (both sidewall and tread area) of the 
tyre shall be marked.   
 
5.3.5 Ply rating or number of plies in the sidewall and the number of plies in the tread area, if 
different. 
 
5.3.6 Each tyre shall be labelled with the name of the manufacturer, or brand name recognized 
quality mark/safety mark to show that the tyre conforms to respective national standards. The tyre may also be marked with any other identification assigned to the manufacturer. 
 
5.3.7 Specific indications, if requir ed may be added to indicate  
 
a) the type of vehicle  for which the tyre  is primarily designed, using the symbol, “P”. This symbol 
may be used where there may be ambiguity regarding the tyre type.  Where this optional marking 
is used, it should be so positioned that confusion cannot result from its proximity to any other service condition marking; 
 b) the temporary  use of certain spare tyres using indications such as “TEMPORARY USE ONLY”;  
c) the bias-belted construction with the words “BIAS- BELTED”; 
 d)  the radial ply construction with  the word “RADIAL”; DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                5  
e) the direction of mounting; 
 
f) the direction  of rotation  
 g) the type of tread pattern and any other characteristics. 
 
Table 2 ⎯ Correlation between load index LI and tyre load-carrying capacity TLCC  
 
LI TLCC  
kg LI TLCC  
kg LI TLCC 
kg LI TLCC  
kg 
50 190 70 335 90 600 110 1060 
51 195 71 345 91 615 111 1090 
52 200 72 355 92 630 112 1120 
53 206 73 365 93 650 113 1150 
54 212 74 375 94 670 114 1180 
55 218 75 387 95 690 115 1215 
56 224 76 400 96 710 116 1250 
57 230 77 412 97 730 117 1285 
58 236 78 425 98 750 118 1320 
59 243 79 437 99 775 119 1360 
60 250 80 450 100 800 120 1400 
61 257 81 462 101 825 — — 
62 265 82 475 102 850 — — 
63 272 83 487 103 875 — — 
64 280 84 500 104 900 — — 
65 290 85 515 105 925 — — 
66 300 86 530 106 950 — — 
67 307 87 545 107 975 — — 
68 315 88 560 108 1 000 — — 
69 325 89 580 109 1 030 — — 
The maximum tyre load capacity corresponding to the load index shall apply for speeds up to and 
including 210 km/h.  
For tyres in the speed category V (between 210 km/h and 240 km/h), the maximum load capacity per 
tyre shall be reduced to 100 % at 210 km/h, 97 % at 220 km/h, 94 % at 230 km/h and 91 % at 240 
km/h, and linear interpolation is permitted. 
In the case of speed categories W and Y, the maximum load capacity per tyre corresponding to the load index shall apply for speeds up to and including 240 km/h for W and 270 km/h for Y. 
For tyres in the speed category W (between 240 km/h and 270 km/h), the maximum load capacity 
per tyre shall be reduced to 100 % at 240 km/h, 95 % at 250 km/h, 90 % at 260 km/h and 85 % at 
270 km/h, and linear interpolation is permitted. 
For tyres in the speed category Y (between 270 km/h and 300 km/h), the maximum load capacity per tyre shall be reduced to 100 % at 270 km/h, 95 % at 280 km/h, 90 % at 290 km/h and 85 % at 300 
km/h, and linear interpolation is permitted. 
See 4.2.3 and Table 3 list speed categories and their symbols.  
For speeds of over 300 km/h or ZR-marked tyres (see annex D) or both, consult the tyre manufacturer for the maximum tyre load capacity permitted in relation to the maximum speed allowed for the tyre. 
For vehicles with a design maximum speed capability of up to 60 km/h, the maximum load capacity corresponding to the load index may be exceeded, as shown below. However, an increase in the 
reference inflation pressure is necessary and should be determined in consultation with the tyre 
manufacturer. In the absence of such agreement, the following pressure increases are 
recommended: 
⎯ for 60 km/h, a 10 % load increase with a 10 kPa inflation pressure increase;  
⎯ for 50 km/h, a 15 % load increase with a 20 kPa inflation pressure increase;  
⎯ for 40 km/h, a 25 % load increase with a 30 kPa inflation pressure increase;  
⎯ for 30 km/h, a 35 % load increase with a 40 kPa inflation pressure increase;  
⎯ for 25 km/h, a 42 % load increase with a 50 kPa inflation pressure increase.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
6                                                                                                © EAC 2004 — All rights reserv ed Table 3 ⎯ Correlation between speed symbol and speed category 
 
Symbol  Category km/h  
J  100  
K  110  
L  120  
M  130  
N  140  
P  150  
Q  160  
R  170  
S  180  
T  190  
U  200  
H  210  
V  240  
W  270  
Y a  300  
NOTE This list is not exhaustive and other categories and symbols might be added later.  
a Radial ply tyres designed for speeds exceeding 300 km/h shall be identified by ZR with the dimensional and 
constructional characteristics in place of the tyre construction code. Consult the tyre manufacturer for the maximum 
speed capability.  
 
6 Marking 
 
Each tyre shall conform to each of the following marking requirements:  
 
a) the designation of the size and construction as in 5.1;    
 
b) the designation of service condition characteristics as in 5.2;   
c) the designation of other service characteristics as in 5.3. 
 
The location of the marking of the load and speed characteristics shall be distinct, but near the marking of the size and construction.  In no cases shall the information be positioned on the tyre so 
that it is obstructed by the flange or any rim designated for use with that tyre. 
 
6.1 Example 1  
 A tyre having 
 
a) a size contraction of: 
 
i) nominal section width 165 mm; 
ii) nominal aspect ratio 80; 
iii) radial ply construction R ; 
iv) nominal rim diameter code 15. 
 
b) service description of;  
 
i) load index 
LI 87, corresponding to a tyre load-carrying capacity of 545 kg. – speed symbol  H, 
corresponding to a speed category of 210 km/h. 
 
c) other service characteristics:  
 
i) TUBELESS : tyre to be used without a tube; shall be marked as follows:  
 
165/80 R 15 87 H  
TUBELESS  
 
NOTE See Annex D for other existing size markings. DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                7  
6.2 Example 2  
 
A tyre marked 225/45 ZR 16 has the following characteristics: 
 
a) nominal section width 225 mm; 
 
b) nominal aspect ratio 45; 
 
c) radial ply construction tyre designed for  operations at speeds in excess of 240 km/h (code 
letters “ ZR”); 
 
d) nominal rim diameter code corresponding to 406 mm (code 16). 
 
NOTE See Annex C for special cases of radial tyres designed for speeds in excess of 210 km/h. 
 
7 Tyre dimensions  
 
Except for the cases in 7.1.1 and 7.1.2, the formula derived values for tyre dimensions are to be 
rounded off to the nearest millimeter. For rounding off, see EAS 124.  
NOTE Dimensions are expressed in millimetres. 
 
7.1 Calculation of “design tyre” dimensions 
 
7.1.1 Theoretical rim width, R th 
 
The theoretical rim width, Rth  is equal to the product of the nominal section width, SN, and the 
rim/section ratio,  K,  
 
Rth = K1 SN 
 For tyres mounted on 5° rims (code – designated) with nominal rim diameter expressed by a two figure code,  
 
K1 = 0.7 for tyres having nominal aspect ratio ( H/S) from 50 to 95 inclusive;  
 K
1 = 0.85 for tyres having nominal aspect ratio ( H/S) from 30 to 45 inclusive; 
 
7.1.2 Measuring rim width,  Rm 
 
The measuring rim width, Rm, is equal to the product of the nominal section width, SN and the 
rim/section width ration coefficient, K2: 
 
Rm = K2 SN 
 
Rounded to the nearest standardized rim. 
 
For tyres mounted on 5° drop-centre rims with a nominal diameter expressed by a two-figure code; 
 
K2 = 0.7 for nominal aspect ratios ( H/S) 95 to 75 inclusive;  
 
K2 = 0.75 nominal aspect ratios ( H/S) 70 to 60 inclusive; 
 
K2 = 0.8 or nominal aspect ratios ( H/S) 55 to 50; 
 
K2 = 0.85 for nominal aspect ratio ( H/S) 45; 
 
K2 = 0.9 for nominal aspect ratios ( H/S) 40 to 30 inclusive. 
 
7.1.3 Design tyre section width, S 
 
The design tyre section width, S is the nominal section width, SN, transferred from the theoretical rim, 
Rth to the measuring rim, Rm. 
 
S = SN + 0.4 ( Rm – Rth ) 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
8                                                                                                © EAC 2004 — All rights reserv ed where  Rm and R th are expressed in millimetres. 
 
 7.1.4  Design tyre section height, H  
 
The design section height, H, is equal to the product of the nominal section width, SN, and the nominal 
aspect ratio, H/S divided by 100:  
 
100S H SHN/=  
 
NOTE H/S = nominal aspect ratio. 
 
7.1.5 Design tyre overall diameter,  Do 
 
The design tyre overall diameter, Do is the sum of the nominal rim diameter, Dr, plus twice the design 
tyre section height, H. 
 
Do = Dr + 2H 
 For those tyres using a nominal rim diameter code, the corresponding value of 
Dr given in Table 1 is 
to be used. 
 7.1.6 Guidelines  
 
Guidelines for “tyre design dimensions” for the metric series of passenger car tyres mounted on 5° 
rims (code-designated) are given in Annex A. Table 5 presents a guide relating to the determination of 
the appropriate rim widths for a given tyre. 
 
7.2 Calculation of “maximum overall (grown) tyre dimension in service” for tyres mounted 
on their measuring rims 
 
This calculation is for use by vehicle manufacturers in designing for tyre clearance.   
 
These dimensions are to be calculated with the coefficients (see Table 4) appropriate to the design tyre section width and the design tyre section height.  
 7.2.1 Maximum overall (grown) width in service,  W
max. 
 
The maximum overall (grown) width in service, Wmax is equal to the greater of the following values: 
 
a) the product of the design tyre section width S  and the appropriate coefficient a (see Table 4); 
 
Wmax = Sa  
 
b) the addition of 8 mm to the design tyre section width, S:  
 
Wmax = S + 8 
 
Table 4 ⎯ Coefficients for calculation of the tyre dimensions 
 
Coefficients Structure  Tyre construction 
code  Nominal aspect 
ratio H/S a b c d 
Diagonal  D -  - 
Bias-belted B  
All  1.1  1.08 -  - 
≤ 65 1.04 
70 1.04  Radial ply   
R 
≥ 75 1.06  
 
1.04  
 
0.96  
 
0.97 
 
NOTE The maximum overall section width may be exceeded by the thickness of a special protective rib on one sidewall. 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                9 7.2.2 Maximum overall (grown) diameter in service, Do max, is equal to the nominal rim diameter, Dr, 
plus twice the product of the design tyre section height H, and the appropriate coefficient b, (see 
Table 4). 
 
D o max = Dr + 2Hb 
 
7.3 Calculation of minimum tyre dimensions for radial ply tyres mounted on their 
measuring rims 
 
7.3.1 Minimum tyre section width,  Smin   
 
The minimum tyre section width, S min, is equal to the product of the design tyre section width, S, and 
the coefficient c (see Table 4).   
 
S min = Sc 
 
7.3.2 Minimum tyre overall diameter, Do min 
 
The minimum tyre overall diameter, D o min, is equal to the nominal rim diameter, Dr, plus twice the 
product of the design tyre section height, H, and the coefficient d (see Table 4). 
 
Do min = Dr + 2Hd 
 
7.4 Range of approved rims  
 
7.4.1 The range of approved rim widths is calculated as the product of the nominal section width, 
SN, and the coefficients shown in Table 5. The values obtained shall be rounded to the nearest 
standardized rim width. 
 
7.4.2 The maximum overall grown width in service, Wmax and the minimum tyre section width, S min, 
will change by 40% of the change in rim width, expressed in millimetres. 
 
Table 5 — Approved rim widths for passenger car tyres as a function of nominal aspect ratio  
 
Coefficients for calculation of approved rim width  Nominal aspect ratio H/S  
min max. 
70 ≤ 95 
50 ≤ 65 
H/S = 45 
35 = H/S ≤  40 
H/S = 30 0.65 
0.7 
0.8 
0.85 
0.9 0.85 
0.9 
0.95 
1 1 
 
8 Tyre dimension presentation  
 
Tyre dimensions shall be shown in tables.  An example for tyres mounted on 5° rims (code- 
designated) and nominal rim diameter expressed by a two-figure code is given in Table 6. 
 
Table 6 ⎯ Example of tyre dimension table 
 
Design dimensions  Maximum dimensions in 
service (grown) Tyre size designation  Measuring rim code  
Section width mm Overall diameter 
D
o mm Overall width W 
max mm Overall diameter D
o 
max mm 
      
 
 
9 Test requirements  
 
9.1 Test sample 
 
The test sample shall constitute: 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
10                                                                                                © EAC 2004 — All rights reser ved 9.1.1 One tyre for physical dimensions, resistance to bead unseating, and strength in sequence;  
 
9.1.2 Another tyre for endurance test; and 
 
9.1.3 A third tyre for high-speed performance. 
 
9.2 Physical dimensions measurement   
 
The tyre physical dimensions shall be determined under uniform ambient conditions as follows: 
 
9.2.1 The sample shall be mounted on a recommended test rim for that tyre size designation and 
inflated to the applicable pressures recommended in Table 7.  Then the tyre shall be conditioned at ambient room temperature for a minimum of 24 h and the pressure re-adjusted to the original value. 
 
9.2.2 The section width and overall are callipered at  six points approximately equally spaced 
around the tyre circumference.  The average of the measurements as the section width and overall width, respectively is recorded. 
 
9.2.3 The tyre overall diameter is determined by measuring the maximum circumference of the tyre 
and dividing this dimension by π = 3.1416. 
 The actual section width and overall width for  each tyre measured in accordance with this procedure 
shall not exceed the section width specified in the submission made   by the manufacturer or in any 
standard tyre and rim matching information; for its size designation and type, by more than 7 %. 
 
Table 7 ⎯ Recommended pressures for measurement of tyre dimensions  
 
Tyre   Pressure (kPa) 
Standard load version  180 
Extra load/reinforced version 230 
“Type” temporary-use spare tyre 420 
 
9.3 Tubeless tyre bead unseating resistance  
 
9.3.1 Preparation of tyre-wheel assembly   
 
The tyre is washed, dried at the beads and mounted without lubrication or adhesives on a clean, painted test rim. The tyre is then inflated to the applicable pressure specified in Table 8 at ambient 
room temperature. The tyre-wheel assembly is mount on a fixture against the tyre side wall as 
required by the geometry of the fixture.  
9.3.2 Test procedure  
 
a) Load is applied through the block to the tyre outer sidewall at the specified distance for the 
applicable wheel size at a rate of 50 mm per minute, with the load arm substantially parallel to 
the tyre and rim assembly at the time of engagement. 
 
b) The load is increased until the bead unseats or the applicable specified value is reached (see 
Table 8). The applied force required to unseat the tyre bead at the point of contact shall be not less than the specified one. 
 
c)  The test is repeated at, at least four different places equally spaced around the tyre 
circumference. 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                11 Table 8 ⎯ Specified values for bead unseating test 
 
Max. inflation 
pressure ( kPa)  Section width (mm) Load rating (kg)  Applied force required to 
unseat the (bead kN) min 
Other than 420 SN < 155 
155 ≥ SN < 205 
SN ≥ 205 - 
- 
- 6.7 
8.9 
11 
420 - 
- - < 400 
400 ≥ LR  > 650 
LR ≥ 650 6.7 8.9 
11 
 
9.4 Tyre strength   
 
9.4.1 Requirement  
 
Each tyre shall need the requirements for maximum breaking energy specifed in Table 9 when tested 
according to 9.4.3. 
 
9.4.2 Preparation of tyre 
 The tyre is mounted on a test rim and inflated to the applicable pressure specified in Table 11. It is then conditioned at room temperature for at least 3 h and the pressure is readjusted to the original 
value. 
 
9.4.3 Test procedure  
 
A 20 mm diameter cylindrical steel plunger is forced, with a hemispherical end perpendicularly into the 
tread rib as near to the centre line as possible, avoiding penetration into the tread groove, at the rate of 50 mm per minute. 
 
The force and penetration at five test points equally spaced around the circumference of the tyre are recorded. If the tyre fails to break before the plunger is stopped by reaching the rim, the force is 
recorded and the values are used in computing the breaking energy for each test point by means of 
the following formula:  
2000P FW×=  
 
where  
  
W = energy in J  
 F = force in N  
P = penetration in mm 
 
The breaking energy for the tyre is determined by computing the average of the five values obtained 
above.   
  
Table 9  ⎯ Minimum breaking energy (Joules) ⎯ Tyre strength tests  
 
Table 9.A — For bias ply tryes with designated section width of 155 mm and above. Maximum 
permissible inflation pressure. 
 
Cord 
material  220.48 (kPa) 248.04 (kPa)  275.6 (kPa)  240 (kPa) 280 (kPa) 300 (kPa) 340 (kPa) 
Rayon 11368.5 1773.8 22737 11368 22737 11368.5 22737 
Nylon or 
polyester 17914 26891 35828  17914 35828 17914 35828 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
12                                                                                                © EAC 2004 — All rights reser ved Table 9.B — For bias ply tyres with designated section width below 155 mm. Maximum 
permissible inflation pressure 
 
Cord 
material  220.48 (kPa) 248.04 (kPa)  275.6 (kPa)  240 (kPa) 280 (kPa) 300 (kPa) 340 (kPa) 
Rayon 6890 12918.75 17225 6890 17225 6890 17225 
Nylon or polyester 13435.5 20153.2 26871 13435.5 26871 13435.5 26871 
 
Table 9.C — For radial ply tyres. Maximum permissible inflation pressure 
 
Tyre other than CT  CT tyres 
psi kPa kPa 
32 36 40 240 280 300 340 350 290 330 350 390 Size designation below 160 mm 2205 3305 4405 2205 4405 2205 4405 2205 2205 4405 2205 4405 
160 mm or above  290 4405 5905 2905 5905 2905 5905 2905 2905 5905 2905 5905 
 
Table 9.D — For tyres with 413.4 kPa maximum permissible inflation pressure and maximum 
load rating of 399 kg and above 
 
Cord material  Breaking energy (J)  
Rayon  186.45 
Nylon or polyester  293.8 
 
Table 9.E — For tyres with 413 kPa maximum permissible inflation pressure and 399 kg 
maximum load rating and below 
 
Code material  Breaking energy (J)  
Rayon 1130 
Nylon or polyester 220.35 
 
9.5 Tyre endurance  
 
9.5.1 Requirement 
 
When the tyre has been subjected  to the laboratory endurance test specified in 9.5.3, using a test rim 
that undergoes no permanent deformation and allows no loss of air through the potion that it 
comprises of the tyres rim pressure chamber; 
 a) there shall be no visual evidence of tread sidewall, ply cord, innerliner or bead separation,  
chunking, broken cords, cracking or open splices and  
 b) the tyre pressure at the end of the test shall be not less than the initial pressure specified in Table 
11. 
 
9.5.2 Preparation of tyre  
 The tyre is mount on a test rim and inflated to the pressure specified in Table 11.  
The tyre assembly is conditioned to 38 ± 2 °C for at least 3 h then the pressure is readjusted to the 
initial value immediately before testing.  
9.5.3 Test procedure  
 The tyre–wheel assembly is mount on a test axle and pressed against a flat-faced steel test wheel, 
with the applicable test load specified in Table 10 for the tyre size, designation type, and max. 
permissible inflation pressure.  
 During the test, the air surrounding the test area shall be kept at 38 ± 2°C. 
 
The test is then conducted at 80 km/h without pressure adjustment or other interruptions as follows: DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                13  
The loads for the following periods are specified percentage of the maximum load rating marked on 
that tyre sidewall. 
 
Table 10 ⎯ Percentage of maximum load rating  
 
4h 85 % 
6h 90 % 
24h 100 % 
 
Immediately after the tyre has run the required time, the inflation pressure is measured.  The tyre is then allowed to cool for one hour, deflated, removed from the test rim and inspected for the conditions 
specified in 9.5.1 (a). 
 
Table 11 — Test inflation pressures 
 
Tyre other than CT 
kPa CT tyres  
kPa Test type max, 
inflation pressure  
240 280 300 340 350 290 330 350 390 
Bead unseating, tyre 
strength and tyre endurance  180 220 180 220 180 230 270 230 270 
High speed 
performance 220 260 220 260 220 270 310 270 310 
 
9.6 High-speed performance   
 
9.6.1 Requirements  
 
When the tyre has been subjected to the laboratory high-speed performance test specified in 9.6.3  
using a test rim that undergoes no permanent deformation and allows no loss of air through the 
portion that it comprises of a tyre-rim pressure chamber, the tyre shall meet the requirements set forth 
in 9.5.1 (a) and (b). 
 
9.6.2 Preparation of tyre  
 
As described in 9.5.2. 
 
9.6.3 Test procedure  
 
The tyre and wheel assembly is mount in accordance with 9.5.3 and pressed against the test wheel 
with a load of 88 % of the tyre's maximum load rating as marked on the tyre sidewall; then is run for 
two hours at 80 km/h. The tyre is allowed to cool to 38 ± 2 °C and the pressure is readjusted to the applicable pressure specified in Table 11. 
 
Then without readjusting inflation pressure, the tyre is tested at 120 km/h for 30 minutes, 130 km/h for 30 minutes and 140 km/h for 30 minutes. 
 
Immediately after running the tyre the required time, the inflation pressure is measured and inspected 
for the conditions specified in 9.5.1 (a). 
 
10 Nonconforming tyres  
 
No tyre that is designed and manufactured for use on passenger cars, that does not conform to the 
requirements of this standard shall be sold, offered for sale, introduced or delivered for introduction into, or imported into East African Community for any purpose. 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
14                                                                                                © EAC 2004 — All rights reser ved  
Annex A 
(normative)  
 
Guideline values for tyres (metric series) 
 
Guidelines for design tyre dimensions (metric series) mounted on 5° rims (code-designated) with 
nominal rim diameter expressed by a two-figure code are given in tables A.1 to A. 7 as a function of nominal aspect ratio. 
 
Table  A.1 – H/S of 95 to 75 inclusive  (K1 = 0.7; K2 = 0.7)  
 
Design tyre dimensions mm Section height, H, at 
H/S (%) of  Approved rim width 
codes min. max.  Nominal 
section 
width SN 
mm  Measuring 
rim width Rm 
code mm  Section 
width S  95 90 85 80 75   
95 2.5 63,5 94 90 86 81 76 71 2.5 3.0 
105 3.0 76 106 100 95 89 84 79 2.5 3.5 
115 3.0 76 113 109 104 98 92 86 3.0 4.0 
125 3.5 89 126 119 113 106 100 94 3.0 4.0 
135 3.5 89 133 128 122 115 108 101 3.5 4.5 
145 4.0 101,5 145 138 131 123 116 109 3.5 5.0 
155 4.5 114,5 157 147 140 132 124 116 4.0 5.0 
165 4.5 114,5 165 157 149 140 132 124 4.0 5.5 
175 5.0 127 177 166 158 149 140 131 4.5 6.0 
185 5.0 127 184 176 167 157 148 139 4.5 6.0 
195 5.5 139,5 196 185 176 166 156 146 5.0 6.5 
205 5.5 139,5 203 195 185 174 164 154 5.0 7.0 
215 6.0 152,5 216 204 194 183 172 161 5.5 7.0 
225 6.0 152,5 223 — 203 191 180 169 6.0 7.5 
235 6.5 165 235 — — 200 188 176 6.0 8.0 
245 7.0 178 248 — — 208 196 184 6.5 8.0 
255 7.0 178 255 — — — 204 191 6.5 8.5 
265 7.5 190,5 267 — — — — 199 7.0 9.0 
275 7.5 190,5 274 — — — — 206 7.0 9.0 
285 8.0 203 286 — — — — 214 7.5 9.5 
295 8.0 203 294 — — — — 221 7.5 10.0 
305 8.5 216 306 — — — — 229 8.0 10.0 
315 8.5 216 313 — — — — 236 8.0 10.5 
Rims outside the approved range in use from previous designs are not approved for new designs. 
 
Table A.2  ⎯ H/S of 70 (K 1 = 0.7; K 2 = 0.75) 
 
Design tyre dimensions  
mm Nominal  
section width 
SN  Measuring rim width  
Rm  Approved rim width 
codes  
mm  code  mm  Section width 
S  Section height  
H  min.  max. 
95  3.0  76  99  67  2.5  3.0  
105  3.0  76  106  74  2.5  3.5  
115  3.5  89  118  81  3.0  4.0  
125  3.5  89  126  88  3.0  4.0  
135  4.0  101,5  138  95  3.5  4.5  
145  4.5  114,5  150  102  3.5  5.0  
155  4.5  114,5  157  109  4.0  5.0  
165  5.0  127  170  116  4.0  5.5  
175  5.0  127  177  123  4.5  6.0  
185  5.5  139,5  189  130  4.5  6.0  
195  6.0  152,5  201  137  5.0  6.5  
205  6.0  152,5  209  144  5.0  7.0  
215  6.5  165  221  151  5.5  7.0  
225  6.5  165  228  158  6.0  7.5  
235  7.0  178  240  165  6.0  8.0  
245  7.0  178  248  172  6.5  8.0  
255  7.5  190,5  260  179  6.5  8.5  
265  8.0  203  272  186  7.0  9.0  
275  8.0  203  279  193  7.0  9.0  
285  8.5  216  292  200  7.5  9.5  
Rims outside the approved range which are in use from previous designs are not approved for new designs.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                15  
Table A.3 - H/S of 65 and 60 (K1 = 0.7; K2 = 0.75) 
 
Design tyre dimensions  
mm  Nominal 
section width  
SN  Measuring rim width  
Rm  
Section height H, at H/S (%) of Approved rim 
width codes  
mm  code  mm  Section width  
S  
65  60  min.  max.  
105  3.0  76  106  68  —  3.0  3.5  
115  3.5  89  118  75  69  3.0  4.0  
125  3.5  89  126  81  75  3.5  4.5  
135  4.0  101,5  138  88  81  3.5  5.0  
145  4.5  114,5  150  94  87  4.0  5.0  
155  4.5  114,5  157  101  93  4.5  5.5  
165  5.0  127  170  107  99  4.5  6.0  
175  5.0  127  177  114  105  5.0  6.0  
185  5.5  139,5  189  120  111  5.0  6.5  
195  6.0  152,5  201  127  117  5.5  7.0  
205  6.0  152,5  209  133  123  5.5  7.5  
215  6.5  165  221  140  129  6.0  7.5  
225  6.5  165  228  146  135  6.0  8.0  
235  7.0  178  240  153  141  6.5  8.5  
245  7.0  178  248  159  147  7.0  8.5  
255  7.5  190,5  260  166  153  7.0  9.0  
265  8.0  203  272  172  159  7.5  9.5  
275  8.0  203  279  179  165  7.5  9.5  
285  8.5  216  292  185  171  8.0  10.0  
295  8.5  216  299  192  177  8.0  10.5  
305  9.0  228,5  311  198  183  8.5  11.0  
315  9.5  241,5  323  205  189  8.5  11.0  
325  9.5  241,5  331  —  195  9.0  11.5  
335  10.0  254  343  —  201  9.0  12.0  
345  10.0  254  350  —  207  9.5  12.0  
Rims outside the approved range in use from previous designs are not approved for new designs.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
16                                                                                                © EAC 2004 — All rights reser ved  
Table A.4  ⎯ H/S of 55 and 50 (K1 = 0.7; K2 = 0.8)  
 
Design tyre dimensions  
mm  Nominal 
section width  
SN  Measuring rim 
width  
Rm  
Section width 
S Section height, H, at H/S (%)of  Approved rim width 
codes  
mm  code  mm   55  50  min. max. 
125  4.0  101,5  131  69  63  3.5 4.5 
135  4.5  114,5  143  74  68  3.5 5.0 
145  4.5  114.5  150  80  73  4.0 5.0 
155  5.0  127  162  85  78  4.5 5.5 
165  5.0  127  170  91  83  4.5 6.0 
175  5.5  139,5  182  96  88  5.0 6.0 
185  6.0  152,5  194  102  93  5.0 6.5 
195  6.0  152,5  201  107  98  5.5 7.0 
205  6.5  165  214  113  103  5.5 7.5 
215  7.0  178  226  118  108  6.0 7.5 
225  7.0  178  233  124  113  6.0 8.0 
235  7.5  190,5  245  129  118  6.5 8.5 
245  7.5  190,5  253  135  123  7.0 8.5 
255  8.0  203  265  140  128  7.0 9.0 
265  8.5  216  277  146  133  7.5 9.5 
275  8.5  216  284  151  138  7.5 9.5 
285  9.0  228,5  297  157  143  8.0 10.0 
295  9.5  241,5  309  162  148  8.0 10.5 
305  9.5  241,5  316  168  153  8.5 11.0 
315  10.0  254  328  173  158  8.5 11.0 
325  10.0  254  336  179  163  9.0 11.5 
335  10.5  266,5  348  184  168  9.0 12.0 
345  11.0  279,5  360  190  173  9.5 12.0 
Rims outside the approved range in use from previous designs are not approved for new designs.  
 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                17  
Table A.5  – H/S of  45 (K1 = 0,85; K2 = 0,85)  
 
Design tyre dimensions  
mm  Nominal 
section width 
SN  Measuring rim width 
Rm  Approved rim width 
codes  
mm  code  mm  Section width  
S  Section height  
H  
min.  max.  
155  5.0  127  153  70  5.0  6.0  
165  5.5  139,5  165  74  5.0  6.0  
175  6.0  152,5  177  79  5.5  6.5  
185  6.0  152,5  183  83  6.0  7.0  
195  6.5  165  195  88  6.0  7.5  
205  7.0  178  207  92  6.5  7.5  
215  7.0  178  213  97  7.0  8.0  
225  7.5  190,5  225  101  7.0  8.5  
235  8.0  203  236  106  7.5  9.0  
245  8.0  203  243  110  7.5  9.0  
255  8.5  216  255  115  8.0  9.5  
265  9.0  228,5  266  119  8.5  10.0  
275  9.0  228,5  273  124  8.5  10.5  
285  9.5  241,5  285  128  9.0  10.5  
295  10.0  254  296  133  9.5  11.0  
305  10.0  254  303  137  9.5  11.5  
315  10.5  266,5  315  142  10.0  12.0  
325  11  279,5  326  146  10.0  12.0  
335  11  279,5  333  151  10.5  12.5  
345  11.5  292  345  155  11.0  13.0  
355  12  305  356  160  11.0  13.5  
365  12  305  363  164  11.5  13.5  
Rims outside the approved range in use from previous designs are not approved for new designs.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
18                                                                                                © EAC 2004 — All rights reser ved  
Table A.6  ⎯ H/S of 40 and 35 (K 1 = 0,85; K 2 = 0,9)  
 
Design tyre dimensions  
mm  Nominal  
section 
width SN  Measuring rim width  
Rm  
Section width  
S  Section height, H, at H/S 
(%)of  Approved rim width  
codes  
mm  code  mm   40  35  min.  max. 
165 6.0 152,5 170 66 — 5.5 6.5 
175 6.0 152,5 177 70 — 6.0 7.0 
185 6.5 165 188 74 65 6.0 7.5 
195 7.0 178 200 78 68 6.5 7.5 
205 7.5 190,5 212 82 72 7.0 8.0 
215 7.5 190,5 218 86 75 7.0 8.5 
225 8.0 203 230 90 79 7.5 9.0 
235 8.5 216 242 94 82 8.0 9.5 
245 8.5 216 248 98 86 8.0 9.5 
255 9.0 228,5 260 102 89 8.5 10.0 
265 9.5 241,5 272 106 93 9.0 10.5 
275 9.5 241,5 278 110 96 9.0 11.0 
285 10.0 254 290 114 100 9.5 11.0 
295 10.5 266,5 301 118 103 10.0 11.5 
305 11.0 279,5 313 122 107 10.0 12.0 
315 11.0 279,5 320 126 110 10.5 12.5 
325 11.5 292 331 130 114 11.0 13.0 
335 12.0 305 343 134 117 11.0 13.0 
345 12.0 305 350 138 121 11.5 13.5 
355 12.5 317,5 361 142 124 12.0 14.0 
365 13.0 330 373 146 128 12.0 14.5 
375 13.5 343 385 — 131 12.5 15.0 
385 13.5 343 391 — 135 13.0 15.0 
395 14.0 355,5 403 — 138 13.0 15.5 
Rims outside the approved range in use from previous design are not approved for new designs.  
 
Table A 7  - H/S of 30 (K1 = 0.85;  K 2 = 0.9)  
 
Design tyre dimensions  
mm  Nominal  
section width 
SN  Measuring rim width  
Rm  Approved rim width 
codes  
mm  code  mm  Section width 
S  Section height  
H min.  max. 
185 6.5 165 188 56 6.5 7.5 
195 7.0 178 200 59 7.0 7.5 
205 7.5 190,5 212 62 7.5 8.0 
215 7.5 190,5 218 65 7.5 8.5 
225 8.0 203 230 68 8.0 9.0 
235 8.5 216 242 71 8.5 9.5 
245 8.5 216 248 74 8.5 9.5 
255 9.0 228,5 260 77 9.0 10.0 
265 9.5 241,5 272 80 9.5 10.5 
275 9.5 241,5 278 83 9.5 11.0 
285 10.0 254 290 86 10.0 11.0 
295 10.5 266,5 301 89 10.5 11.5 
305 11.0 279,5 313 92 11.0 12.0 
315 11.0 279,5 320 95 11.0 12.5 
325 11.5 292 331 98 11.5 13.0 
335 12.0 305 343 101 12.0 13.0 
345 12.0 305 350 104 12.0 13.5 
355 12.5 317,5 361 107 12.5 14.0 
365 13.0 330 373 110 13.0 14.5 
375 13.5 343 385 113 13.5 15.0 
385 13.5 343 391 116 13.5 15.0 
395 14.0 355,5 403 119 14.0 15.5 
Rims outside the approved range in use from previous designs are not approved for new designs.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                19  
Annex B 
(normative) 
 
Load capacity indices for passenger car tyres 
 
Table B.1 gives equivalences, based on overall diameter, for tyres in standard load version. Load-
carrying capacity indices are referred to a basic inflation pressure of 240 kPa. Load indices given are 
preferred values for international use. Sizes given in parentheses are those for tyres equivalent in 
overall diameter with higher load capacity indices.  
Table B.2 gives tyre load capacity indices, grouped by nominal rim diameter and nominal aspect ratio, 
referred to a basic pressure of 240 kPa for the standard load version, and 280 kPa for the 
REINFORCED or EXTRA LOAD version.  
For future revisions of the values in Table B.2 it is recommended that all values be increased by the 
same amount.  
Table B.3 gives the load capacity indices for T-type temporary spare tyres, with a reference pressure 
of 420 kPa.  
Table B.4 gives the load capacity indices for P-type LIGHT LOAD tyres with a reference pressure of 
240 kPa. 
 
Table B.1 — Standard load version equivalences 
 
70 series  65 series  60 series  55 series  50 series  Load index  
—  155/65 R 12  165/60 R 12  —  —  71  
145/70 R 12  145/65 R 13  155/60 R 13  —  —  69  
155/70 R 12  155/65 R 13  165/60 R 13  175/55 R 13  —  73  
165/70 R 12  165/65 R 13  175/60 R 13  185/55 R 13  185/50 R 14  77  
175/70 R 12  175/65 R 13  185/60 R 13  195/55 R 13  195/50 R 14  80  
—  185/65 R 13  195/60 R 13  —  205/50 R 14  84  
—  195/65 R 13  205/60 R 13  —  —  87  
—  205/65 R 13  215/60 R 13  —  —  89  
—  215/65 R 13  225/60 R 13  —  —  92  
155/70 R 13  155/65 R 14  165/60 R 14  175/55 R 14  —  75  
165/70 R 13  165/65 R 14  175/60 R 14  185/55 R 14  185/50 R 15  79  
175/70 R 13 —  175/65 R 14 —  185/60 R 14 —  195/55 R 14 205/55 R 14  195/50 R 15 205/50 R 15  82 85  
185/70 R 13 —  185/65 R 14 —  195/60 R 14 —  — (215/55 R 14)  — (215/50 R 15)  86 (88)  
195/70 R 13 —  195/65 R 14 —  205/60 R 14 —  — (225/55 R 14)  — (225/50 R 15)  89 (91)  
205/70 R 13 —  205/65 R 14 —  215/60 R 14 —  — (235/55 R 14)  — (235/50 R 15)  91 (93)  
215/70 R 13  215/65 R 14  225/60 R 14  —  —  94  
 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
20                                                                                                © EAC 2004 — All rights reser ved  
 
Table B.1 (continued ) 
 
70 series  65 series  60 series  55 series  50 series  Load 
index  
155/70 R 14  155/65 R 15  165/60 R 15  175/55 R 15  —  77  
165/70 R 14  165/65 R 15  175/60 R 15  185/55 R 15  185/50R 16  81  
175/70 R 14 —  175/65 R 15 —  185/60 R 15 —  195/55 R 15 205/55 R 15 195/50R 16 205/50R 16  84 87  
185/70 R 14 —  185/65 R 15 —  195/60 R 15 —  — (215/55 R 15)  — (215/50 R 16)  88 (90)  
195/70 R 14 —  195/65 R 15 —  205/60 R 15 —  — (225/55 R 15)  — (225/50 R 16)  91 (92)  
205/70 R 14 —  205/65 R 15 —  215/60 R 15 —  — (235/55 R 15)  — (235/50 R 16)  94 (95)  
215/70 R 14 —  215/65 R 15 —  225/60 R 15 (235/60 R 15) — (245/55 R 15)  — (245/50 R 16)  96 (98)  
225/70 R 14 —  225/65 R 15 —  — (245/60 R 15)  — (255/55 R 15)  — (255/50 R 16)  99 (100)  
—  —  —  205/55 R 16  205/50 R 17  89  
185/70 R 15 —  185/65 R 16 —  195/60 R 16 —  — (215/55 R 16)  — (215/50 R 17)  89 (91)  
195/70 R 15 —  195/65 R 16 —  205/60 R 16 —  — (225/55 R 16)  — (225/50 R 17)  92 (94)  
205/70 R 15 —  205/65 R 16 —  215/60 R 16 —  — (235/55 R 16)  — (235/50 R 17)  95 (96)  
215/70 R 15 —  215/65 R 16 —  225/60 R 16 —  — (245/55 R 16)  — (245/50 R 17)  98 (99)  
225/70 R 15  225/65 R 16  235/60 R 16  —  —  100  
235/70 R 15  235/65 R 16  —  —  —  103  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                21  
Table B.2 — Load capacity indices 
 
Nominal 
section  80 
series  75 
series  70 
series  65 
series  60 
series  55 
series  50 
series  45 
series  40 
series  35 
series  30 series  
Nominal rim-diameter code 10  
145  69   63          
155  73   67          
165    72          
Nominal rim-diameter code 12  
135  68   65          
145  74   69  67         
155  77   73  71  68        
165    77   71        
175    80  78         
Nominal rim-diameter code 13  
125  65            
135  70   68          
145  75   71  69         
155  79   75  73  69        
165  83   79  77  73  70       
175  86   82  80  77  73       
185  90   86  84  80  77   72     
195    89  87  84  80   75     
205    91  89  87    78  74    
215    94  92  89   84  81  77    
225      92   86  84  80    
235      94   89  87  83    
245        91  89  85    
255         92  88    
265         94  90    
275         97  93    
285         99  95    
Nominal rim-diameter code 14  
135    69          
145    73          
155  81   77  75         
165  85   81  79  75  72       
175  88  86  84  82  79  75       
185  91  89  88  86  82  79  77  74     
195  95  92  91  89  86  82  80  77     
205  98  95  94  91  89  85  84  80  76    
215   98  96  94  91  88   83  79    
225   101  99   94  91   86  82    
235    101   96  93   88  84    
245    103   99  96  93  91  87    
255      101  98  95  93  89    
265      103  100  98  96  92    
275      105    98  94    
285         100  96    
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
22                                                                                                © EAC 2004 — All rights reser ved Table B.2 (continued ) 
 
Nominal 
section  80 
series  75 
series  70 
series  65 
series  60 
series  55 
series  50 
series  45 
series  40 series  35 series  30 
series  
Nominal rim-diameter code 15  
145    75          
155  83   78  77         
165  87   82  81  77        
175  90   86  84  81  77  75      
185  93   89  88  84  81  79  75     
195  96  94  92  91  88  84  82  78     
205   97  95  94  91  87  85  81  77    
215  101  100  98  96  94  90  88  84  80    
225  105  102  100  99  96  92  91  87  83  79   
235   105  103  100  98  95  93  90  86  81   
245    105  102  100  98  95  92  88  84   
255   110  108  106  102  100  97  95  91  86   
265   112  110   105   99  97  93  89   
275      107  104  101  99  95  91   
285        104  101  98  93   
295        105  104  100  95   
305         106  102  97   
315         108  104  99   
325         110  106  101   
335         112  108  103   
345         114  110  105   
Nominal rim-diameter code 16  
155  85            
175  91            
185     89    81  77     
195     92  89   84  80     
205  100   97  95  92  89  87  83  79    
215  103  101  99  98  95  91  90  86  82    
225   104  102  100  98  94  92  89  85  80   
235  109  106  105  103  100  96  95  91  87  83   
245   109  107    99  98  94  90  86   
255     109  103   100  96  92  88   
265    112     101  98  95  90   
275    114     103  101  97  92   
285         103  99  95   
295         105  101  97   
305         107  103  99   
315         109  105  100   
325         111  107  102   
335         113  109  104   
345         115  111  106   
Nominal rim-diameter code 17  
185         78     
195         81     
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                23 Table B.2 (continued ) 
 
Nominal 
section  80 
series  75 series  70 series  65 series  60 
series  55 
series 50 
series  45 
series  40 series  35 series  30 series  
205        89  84  80    
215        91  87  83    
225        94  90  86  82   
235       97  96  93  90  84   
245      103   99  95  91  87   
255       102  100  98  94  89   
265      108    100  96  92  87  
275      110    102  98  94  89  
285         104  100  96  91  
295         107  102  98  93  
305         109  104  100  95  
315         111  106  102  97  
325         113  109  104  99  
335         115  110  106  101  
345         116  112  108  102  
355         118   109  104  
365         120   111  106  
375            108  
385            109  
Nominal rim-diameter code 18  
185         79     
195         83     
205       91   86  82    
215         89  85    
225         91  88  83   
235      103    94  91  86   
245      104    96  93  88   
255      109    99  95  90   
265         101  97  93  88  
275         103  99  95  90  
285         105  101  97  93  
295         108  103  99  94  
305         110  106  101  96  
315         112  108  103  98  
325         114  110  105  100  
335         116  112  107  102  
345         118  114  109  104  
355         119   111  106  
365         121   112  107  
375            109  
385            110  
Nominal rim-diameter code 19  
185         81     
195         84     
205         87  83    
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
24                                                                                                © EAC 2004 — All rights reser ved Table B.2 (continued ) 
 
Nominal 
section  80 
series  75 series  70 series  65 series 60 series  55 series 50 series  45 
series  40 
series  35 
series  30 series  
215         90  86    
225         92  89  84   
235         95  92  87   
245         98  94  89   
255         100  96  92   
265         102  98  94  89  
275         104  101  96  92  
285         107  103  99  94  
295         109  105  100  96  
305         111  107  102  98  
315         113  109  104  100  
325         115  111  106  101  
335         117  113  108  103  
345         119  115  110  105  
355         121   112  107  
365         122   114  109  
375            110  
385            112  
Nominal rim-diameter code 20  
185         82     
195         85     
205         88  84    
215         91  87    
225         94  90  86   
235         96  93  88   
245         99  95  91   
255         101  97  93   
265         104  100  95  90  
275         106  102  98  93  
285         108  104  100  95  
295         110  106  102  97  
305         112  108  104  99  
315         114  110  106  101  
325         116  112  108  103  
335         118  114  110  104  
345         120  116  111  106  
355         122   113  108  
365         123   115  110  
375            112  
385            113  
Load capacity indices for reinforced/extra load versions are determined by adding 4 points to standard load LIs.  
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
© EAC 2004 — All rights reserved                                                                                                25  
Table B.3 — Load capacity indices for T-type light load tyre with reference pressure 420 kPa 
 
Tyre designation  Load index  Tyre designation  Load index  
T 135/60_a16  92  T 125/80_a15  95  
T 105/70_a14  84  T 135/80_a15  100  
T 115/70_a14  88  T 115/80_a16  92  
T 125/70_a14  93  T 125/80_a16  97  
T 135/70_a14  97  T 135/80_a16  101  
T 105/70 _a15  85  T 145/80_a16  105  
T 115/70 1_a5  90  T 155/80_a16  109  
T 125/70 _a15  95  T 135/80_a17  103  
T 135/70_a15  99  T 135/80_a18  104  
T 105/70_a16  87  T 125/85_a15  97  
T 115/70_a16  92  T 105/90_a12  80  
T 125/70_a16  96  T 115/90_a12  86  
T 135/70_a16  100  T 125/90_a12  90  
T 125/70_a17  98  T 125/90_a15  96  
T 135/70_a17  102  T 135/90_a15  100  
T 145/70_a17  106  T 125/90_a16  98  
T 155/70_a17  110  T 135/90_a16  102  
T 125/70_a18  99  T 145/90_a16  106  
T 105/80_a13  82  T 155/90_a16  110  
T 125/80_a13  92  T 165/90_a17  115  
T 135/80_a14  97  T 105/95_a17  90  
a  D, B or R to be inserted here, depending on the tyre structure.  
 
Table B.4 — Load capacity indices for P-type LIGHT LOAD (LL) tyre with reference pressure of 
240 kPa  
 
Tyre designation  Load index Tyre designation  Load index 
 30 SERIES   P245/40R18   90 
P335/30R18   95 P255/40R19   91 
    P265/40R18   92 
 35 SERIES   P275/40R17   93 
    P275/40R18   94 
P245/35R18   80 P285/40R17   95 
P275/35R20   89 P295/40R20   101 
P285/35R17   88     
P285/35R18   89  45 SERIES   
P315/35R17   93     
P335/35R17   97 P225/45R17   84 
    P235/45R17   87 
 40 SERIES   P245/45R16   88 
    P245/45R17   89 
P205/40R16   75 P255/45R17   92 
P225/40R18   83 P265/45R16   92 
P245/40R17   86 P295/45R18   101 
P245/40R18   88 P305/45R17   102 
P245/40R20   90 P315/45R17   104 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEWEAS 358:2004  
26                                                                                                © EAC 2004 — All rights reser ved  
Annex C 
(informative) 
 
Marking of radial tyres designed for vehicle with maximum speeds above 210 
km/h 
 
C.1 The code letters “ VR” may be used within the dimensional and constructional characteristics 
in place of the tyre construction code for radial ply tyres designed for equipment on some existing 
vehicles with maximum speeds above 210 km/h. 
 Example  
 
215 /60 VR 15 
 This precludes the marking of service description . For the maximum speed capability and the load 
capacity of the tyres, the tyre manufacturer concerned shall be consulted. 
 
C.2 The code letters “ZR” may be used within the di mensional and constructional characteristics 
in place of the tyre construction code for radial ply tyres designed to equip some existing vehicles with maximum speeds above 240 km/h. 
 
Example  
 
205/50 ZR 16   
 This precludes the marking of service description . For the maximum speed capability and the load 
capacity of the tyres, the tyre manufacturer concerned shall be consulted. 
 
C.3 The code letters “ZR” may be used within the dimensional and constructional characteristics, 
in place of the tyre construction code (see 5.1.3) and in conjunction with “W” speed symbol and load index to identify tyre performances up to 270 km/h.  
 
Example  
195/50 ZR 15 82W 
 
C.4 The code-letters “ZR” may be used in the dimensional and constructional characteristics (see 
5.1.3)  associated with the speed code Y and the load index to identify tyre performances up to 300 
km/h. 
 
Example 
 
195/50 ZR 15 82Y  
 
  
 
   
 
 
 DRAFT UGANDA STANDARD ON PUBLIC REVIEW                                                                                                      EAS 358:2004  
 
 
© EAC 2004 — All rights reserved