هيئة التقييس لدول مجلس التعاون لدول الخليج العربية  
GCC STANDARDIZATION ORGANIZATION (GSO)  
 
 
مشروع مواصفة نهائي 
Final Draft of  Standard FDS  
  
 
 
 
إعداد اللجنةالفنية الفرعية  الخليجية رقم TC 02/SC 01 
 
Prepared by GSO Technical Sub -Committee No. TC 02/SC 01  
 
  
 
GSO 02  /01/FDS/  52 :2018  
 
 
 
 
إطارات سيارات الركوب  الجزء الثاني: المتطلبات العامة  
 
Passenger Car Tyres Part 2: General Requirements  
 
 
 
 
   ICS:  83.160.10; 83.160.01    
هذه الوثيقة مشروعلمواصفة قياسية  خليجية تم توزيعها 
لإبداء الرأي والملحوظات بشأنها ، لذلك فإنها عرضة 
للتغيير والتبديل ، ولا يجوز الرجوع إليها كمواصفة 
قياسية  خليجية إلا بعد اعتمادها من الهيئة. This document is  a draft Gulf Standard  
circulated for comments. It is, therefore, 
subject to alteration and modification 
and may not be referred to as a Gulf 
Standard  until approved by GSO.  GSO 52:2018             GSO STANDARD 
 
 
 2 
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هيئةةة التقيةةي  لةةدو  مجلةة  التعةةاو   لةةدو  الخلةةي  العربيةةة هيئةةة إقليميةةة تضةةم فةة  عضةةويتها أجهةة   التقيةةي  
الوطنيةةة فةة  الةةدو  الأعضةةاء ، ومةةن مهةةا  الهيئةةة إعةةداد المواصةةفات القياسةةية واللةةوا ا الفنيةةة الخليجيةةة 
بواسطة لجا  فنية متخصصة . 
قةةةةر  المجلةةةة  الفنةةةة  لهيئةةةةة التقيةةةةي  لةةةةدو  مجلةةةة  التعةةةةاو  لةةةةدو  الخلةةةةي  العربيةةةةة فةةةة  اجتماعةةةة   قةةةةةةم ( ) 
الةةةةةةةةةةذي عقةةةةةةةةةةد بتةةةةةةةةةةا ي ......./......./....... هةةةةةةةةةةة ،الموافةةةةةةةةةة. ......./...../.......   اعتمةةةةةةةةةةاد تحةةةةةةةةةةدي  
اللا حةةةةةةة الفنيةةةةةةة الخليجيةةةةةةة  قةةةةةةم  GSO 52:2018  "إطةةةةةةا ات سةةةةةةيا ات الركةةةةةةو  الجةةةةةة ء ال ةةةةةةان 
المتطلبةةةةات العامةةةةة " التةةةة  تةةةةم د اسةةةةتها و إعةةةةدادها ضةةةةمن برنةةةةام  عمةةةةل اللجنةةةةة الفنيةةةةة الفرعيةةةةة الخليجيةةةةة 
 قةةةم TC 02/SC01  " اللجنةةةة الفنيةةةة الفرعيةةةة الخليجيةةةة لمواصةةةفات المركبةةةات والإطةةةا ات " المد جةةةة 
ف  خطة دولة الكويت . 
على أ  تلغ  اللا حة الفنية الخليجية الخليجية  قم GSO 52:2007 و تحل محلها 
 
 
 
 
 
 
 
 
 
 
 
 
 
 GSO 52:2018             GSO STANDARD 
 
 
 3 
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  deleted paragraphs  Passenger Car Tyres Part 2: General Requirements  
 
 
1- SCOPE AND FIELD OF APPLICATION  
 
 This standard is concerned with the requirements of the new passenger car 
tyres and inflated with compressed air.  
 
2- COMPLEMENTARY REFERENCES  
 
2.1              GSO 51/2017 “Passenger Car Tyres - Part 1: Nomen clature, Designation,   
             Marking, Dimensions, Load Capacity and Inflation Pressure ”. 
 
2.2              GSO 53/2017  “Passenger Car Tyres - Part 3:  Methods of Test”.  
 
2.3              GSO 1783/2017 “Passenger Car Tyres – Tread  wear, Traction and  
                   Temperature Resistance Grading”.  
 
2.4              GSO 1784/2017 “Passenger Car Tyres – Methods of Testing of Temperature   
             Resistance Grading”.  
 
 
3- DIFINTIONS  
  
The definitions shall be in accordance with the Gulf Standard GSO 51/2017 
as mentioned in item 2.1.  
 
4- REQUIREMENTS  
 
 The following shall be met by passenger car tyres.  
 
4.1 Appearance  
 It shall be free from apparent cracks or cuts or any foreign matter in the tread 
or on either of the sidewalls of the tyre.  It sha ll not be contaminated with 
mineral oil, and the tread shall be even and no exposed ply cord shall be 
apparent to the tyre.  
 
4.2 Dimensions, Load Capacity and Inflation P ressure  
 
4.2.1  The dimensions, load capacity and inflation pressure shall be in accord ance 
with Gulf Standard mentioned in item 2.1.  
 
4.2.2  The dimension shall be in metric system.  
 
4.2.3  Section Width of a Tyre  
 
4.2.3.1         The section width shall be calculated by the following formula:  
S = SN + K (r -rth), 
 GSO 52:2018             GSO STANDARD 
 
 
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S is the "section width" rounded to the nearest millimetre and 
measured on the measuring rim ; 
 
SN is the "nominal section width" (in mm) as shown on the side wall of 
the tyre in the designation of the tyre as prescribed ; 
 
r is the width (in mm) of the measuring rim, as shown by the 
manufa cturer in the descriptive note;  
 
 (When the conventional number is given by codes, the value in   
 mm is obtained by multiplying such number by 25.4).  
 
rth     is the width ( in mm) of the theoretical rim; ( see Paragraph 3.29 of 
GSO 51/2017).  
 
 Note: The theoretical rim width (‘r_th’) equals:  
0.7 * (SN) for tyres with Nominal Aspect Ratio 50 and larger.  
0.85 * (SN) for tyres with Nominal Aspect Ratio 45 and smaller.  
 0.67 * (SN) for ‘CT’ tyres.  
1* (SN) for ‘A’  or ‘U’  metric tyres.  
 
K       shall be taken to  equal  0.4. 
 
4.2.3.2  For tyres identified by the "tyre to rim fitment configuration" Metric "A", or “U” 
tyre, K shall be taken equal to 0.6.  
 
4.2.4  Tyre Section Width Specifications  
 
4.2.4.1        The overall width of a tyre may be less th an the section width determined  
pursuant  to paragraph  4.2.3.1 above. Howev er, it may exceed that value by  
the following  percentages, whereby the  limits shall be rounded to the  
nearest mm :                          
 
4.2.4.1.1  6% for diagonal (bias -ply) tyres:       
 
4.2.4.1.2  4% for radial, run flat tyres:        
 
4.2.4.1.3  If the tyre has special protective ribs or bands, the overall width may be 
exceeded by 8 mm.  
 
4.2.4.1.4  If the tyre is an “A” or “U” metric tyre, the overall width in the bead area shall 
not exceed the nominal rim width increased by 20 mm.  
 
4.2.5         Outer Diameter of a Tyre  
 
4.2.5.1        The outer diameter of a tyre shall be obtained by means of the following  
                   formula:  GSO 52:2018             GSO STANDARD 
 
 
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D = d + 2H  
             
where:  
 
D  is the outer diameter (in mm);  
d is the Nominal Rim Diameter (in mm) defined in paragraph 4.3 of 
GSO 51/2017 ; 
 
H  is the nominal section height rounded to the nearest millimetre and 
equal s to:  
 
                         H = 0.01 * Nominal Section Width (SN) *   Nominal Aspect Ratio (H/SN)  
 
all as shown on the sidewall of the ty re in the tyre -size designation.  
 
4.2.6          Tyre Outer Diameter Specifications  
 
The outer diameter of a tyre must not be outside the values D min and D max 
obtained from the following formulae:  
 
        Dmin = d + (2 * H min)  
 
        Dmax = d + (2 * H max) 
 
      where:  
 
                   Hmin = (H * a) rounded to the nearest mm  
 
       Hmax = (H * b) rounded to the nearest mm  
 
4.2.6.1   For tyres identified by the "tyre to rim fitment configuration" Metric "A" or "U" 
tyres, the nominal section height H is equal to: H = 0.5 (D -d), round ed to the 
nearest mm.  (For references see paragraph 4.2.5.1 above).  
 
4.2.6 .2         Coefficients "a" and "b" are respectively:  
 
4.2.6.2.1       Coefficient "a" = 0.97  
  
 4.2.4. 6.2     Coefficient "b"  
 
Coefficient "b"  
 Radial , run flat  tyre Diagonal and Bias 
Belted  
for normal tyres  1.04 1.08 
for special -use tyres  1.06 1.09 
 
4.3 Tensile Strength and E longation  
 The tensile strength of tread rubber shall not be less than 1.2 kg/mm2, and 
the elongation shall not be less than 300%.  
 GSO 52:2018             GSO STANDARD 
 
 
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 The tensile strength of tread rubber shall not be less than 80% of the tensile 
strength of the sample before continuous ageing for 96 hrs at (70  1)oC. 
 
4.5 Strength  
 The breaking energy of each tyre shall not be less than the values specified 
in Table (1 ) when tested in accordance with the Gulf Standard GSO 53/2017 
as mentioned in item 2.2.  
 
TABLE 1  
Minimum Breaking Energy Values  (J) 
 
Nominal Section Width  
and 
Body -Ply Cord Material  Diagonal (bias -
ply) Tyres  Radial Tyres  Diagonal T -type 
Temporary Use 
Tyres  
Ply rating  Standard  Reinforced  
Extra Load  Load Index  
4 6 8    75 
(387 kg)   76 
(400 kg)  
Below 160 mm  
Rayon  
Other than rayon   
113 
220  
212 
330  
282 
441  
113 
221  
282 
441  
113 
221  
186 
295 
160 mm and above  
Rayon  
Other than rayon   
186 
294  
280 
441  
373 
588  
186 
295  
373 
588  
113 
221  
186 
295 
 
4.6 Endurance  
 
4.6.1  When the tire has been subjected to the laboratory endurance test 
specified in accordance with the Gulf standard GSO 53/2017 as mentioned 
in item 2.2. using a test rim that undergoes no permanent deformation and 
allows no loss of air through the portion th at it comprises of the tire -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.  
 
(a) The tire pressure at the end of the test shall be not less than the initial 
pressures measured before the test  
 
4.6.1  There shall be no evidence of tread, sidewall, ply, cord, inner liner, belt or 
bead separation, chunking, open splices, cracking or broke n cords after the 
tyre has been subjected to the endurance test specified in accordance with 
the Gulf standard mentioned in item 2.2.  
 
4.6.2  The tyre pressure measured immediately after the test shall not be less than 
the initial pressure measured before t he test.  
4.7 High Speed P erformance  
 GSO 52:2018             GSO STANDARD 
 
 
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specified in accordance with the Gulf standard mentioned in item 2.2. using 
a test rim that undergoes no permanent deformation and allows no loss o f 
air through the portion that it comprises of the tire -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.  
 
(b) The tire pressure at the end of the test shall be not less than the initial 
pressures   
                        measured before the test.  
 
4.7.1  There shall be no evidence of tread, side wall, ply, cord, inner liner, belt or 
bead separation, chunking, open  splices, cracking or broken cords after the 
tyre has been subjected to the high speed endurance test specified in 
accordance with the Gulf standard mentioned in item 2.2.  
 
4.7.2  The tyre pressure measured immediately after the test shall not be less than 
the initial pressure measured before the test.  
 
4.8 Bead Unseating R esistance [tubeless tyres]  
When a tubeless tire that has a maximum inflation pressure other than 420 
kPa is tested in in accordance with the Gulf standard GSO 53/2017 as 
mentioned in item  2.2, the applied force required to unseat the tire bead at 
the point of contact shall be not less than the following values:  
 
Nominal section width, SN (mm)  Force (N)  
SN < 160  6670  
160  SN < 205  8890  
SN  205 11120  
 
 For Diagonal T -type Temporary Use  Tyres  
 
Tyre load i ndex, LI  Force  (N) 
75 (399 kg) and below  6670  
76 (399 kg)  LI   92 (635 kg)  8890  
LI > 92 (635 kg)  11120  
 
4.9              Tread Pattern of a Tyre  
 
4.9.1           In order to be classified as a "special use tyre" a tyre shall have a block  
                   tread pattern in which the blocks are larger and more widely spaced than  
                   for normal tyres and have the following characteristics:  
  (a) A tread depth ≥ 11 mm  
  (b) A void -to-fill ratio ≥ 35 per cent  
 
4.9.2          In order  to be classified as a "professional off -road tyre", a tyre shall have all  
                   of the following characteristics:  
  (a) A tread  depth ≥ 11 mm;  GSO 52:2018             GSO STANDARD 
 
 
 8 
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  deleted paragraphs    (b) A void -to-fill ratio ≥ 35 per cent;  
  (c) A maximum speed rating of ≤ Q."  
 
4.9.3  Tread W ear Indicators  
 
4.9.3.1  Each tyre shall have at least six transverse rows of wear indicators, 
approximately equally spaced and situated in the principal grooves of the 
tread.   The tread -wear indicators shall be such that they cannot be confused 
with the rubber ridges between the ribs or blocks of the tread.  
 
4.9.3.2  Tyres designed for mounting on rims of nominal rim diameter code 12 or less, 
not less than four traverse rows of  tread wear indicators are acceptable.  
 
4.9.3. 3 The tread -wear indicators must provide a means of indicating with a 
tolerance  of +0.60/ -0.00 mm, when the tread grooves are no longer more 
than 1.6  mm deep . 
 
4.9.3.4  The height of tread -wear indicators is determined by measuring the 
difference between the depth, from the tread's surface, to the top of the 
tread -wear indicator and to the bottom of the tread groove close to the 
slope at the base of the tread wear indicator.  
 
4.10 Speed Symbol  
 
4.10.1 The spee d symbol shall be marked on the tyre, and it shall be as indicated 
in Gulf standard mentioned in item 2.1.  
 
4.10.2  The speed symbol marked on the tyre shall be ‘S’ or higher, except in case 
of ‘Temporary Use’ spare tyres where it shall be M or higher.  
 
4.10.3 The speed symbol marked on the professional off -road tyre (POR) shall be 
‘P’ or ‘ Q’. 
 
4.11 Temperature R ating  
 
4.11.1 Each tyre shall be graded for temperature resistance grade in accordance 
with the Gulf mentioned in item 2.4.  
 
4.11.2 The temperature  rating of passenger car tyres shall be “A” or “B”.  
 
4.11.3 The temperature resistance performance shall be obtained when testing the 
tyres in accordance with the Gulf standard mentioned in item 2.5.  
 
5- MARKING  
 
 The marking of the tyre shall be in accordance with Gulf Standard GSO 
51/2017 as mentioned in item 2.1.  
 
6- TRANSPORTATION AND STORAGE  GSO 52:2018             GSO STANDARD 
 
 
 9 
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  deleted paragraphs  6.1 Tyres shall be transported in such a way so as to protect it from damage and 
shall be stored away from sunshine, rain  and moisture, oil or grease, and heat 
or any apparatus which may cause electrical sparking . 
 
6.2 The storage of tyres shall be in accordance with the Gulf standard 
mentioned in item 2.3.  
 
7. SAMPLING  
 
 Four tyres with identical characteristics, e.g. size designation and service 
description or maximum load rating and speed capability, shall comprise a 
test sample:  
 
a) One tyre shall be used for the measurement of bead unseating 
resistance [for tubeless tyres] then of strength and then used for tensile 
strength  and elongation test and for ageing test.  
 
b) A second tyre shall be used for the endurance test.  
 
c) A third tyre shall be used for the high speed performance.  
 
d) A fourth tyre shall be used for the temperature rating.  
Each test sample shall conform to the requirements specified in 8 .1 and 8.2.  
 
8- TESTS  
 
 The following tests shall be carried out on samples taken in accordance with 
item 7.  
 
a. Visual inspection  
 
b. Measurement of dimensions  
 
c. Tensile strength and elongation  
 
d. Ageing  
 
e. Strength  
 
f. Endurance  
 
g. High speed performance  
 
h. Bead unseating resistance [for tubeless tyres]  
 
i. Temperature rating  
 
9- METHODS OF INSPECTION AND TESTING  GSO 52:2018             GSO STANDARD 
 
 
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  deleted paragraphs   Tests shall be carried out in accordance with Gulf Standards GSO 53/2017, 
GSO 1783/2017, and GSO 1784/2017 as mentioned in item s 2.2, 2.3 and 2.4, 
respectively . 
 
10- CRITERIA OF TECHNICAL CONFORMITY  
 
10.1 Two months at least before dispatching the consignment of any type of 
tyres, the manufacturer shall send to the Standardization Organization for 
G.C.C. (GSO) in English and/or Arabic languages, certifying that this type of 
tyres meets the requirements of Gulf standard for tyres. The certificate shall 
include the following:  
 
10.1.1  Designation of dimensions, construction, nominal tyre rim diameter and 
service description.  
 
10.1.2  Tube t ype or tubeless.  
 
10.1.3  The production period which shall not be more than one full year.  
 
10.1.4  Trade name, trade mark, brand name or manufacturer’s name.  
 
10.1.5  Country of production.  
 
10.1.6  A guarantee valid for at least one year.  
 
10.1.7  Temperatur e rating  
 
10.2 The results of tests carried out shall be supplied to GSO.  
 
10.3 The tyres shall be exported within twelve (12) months from the date of 
production indicated on the tyre.  
 
10.4 The approved conformity certificate shall be valid only for one year from the 
date of approval.  
 
10.5 In case of GSO acceptance of the certificate mentioned in item 10.1, the 
type of tyres shall be considered acceptable.  
 
10.6 In case the certificate is not accepted (because information is incomplete 
or subject to question), the information may be completed. If not completed 
or if necessary, substantiated tests, as required by GSO shall be carried out 
on tyre samples.  
  GSO 52:2018             GSO STANDARD 
 
 
 11 
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  deleted paragraphs  REFERENCES : 
 
1) ECE No. 30 “Pneumatic Tyres (Passenger Vehicle)”, Revision 3: 29th March 2007 . 
 
2) ECE No. 30 “Pneumatic Tyres (Passenger Vehicle)”, Revision 3/Amendment 1. 
10th November 2007.  
 
3) ECE No. 30 “Pneumatic Tyres (Passenger Vehicle)”, Revision 3/Amendment 2. 
17th March 2010.  
 
4) ECE No. 30 “Pneumatic Tyres (Passenger Vehicle)”, Revision 3/Amendment 3. 
27th January 2013.  
 
5) ECE No. 30 “Pneumatic Tyres (Passenger Vehicle)”, Revision 3/Amendment 4. 9th 
February 2017.  
 
6) FMVSS No. 109 “New Pneumatic and Certain Specialty Tires”. 2015  
 
7) ISO 4223 -1 “Definition of some terms used in tyre industry – Part 1: Pneumatic 
tyres”  
 
8) ISO 10191 “Passenger car tyres – Verifying tyre capabilities – Laboratory test 
methods”