ھﯿﺌﺔ اﻟﺘﻘﯿﯿﺲ ﻟﺪول ﻣﺠﻠﺲ اﻟﺘﻌﺎون ﻟﺪول اﻟﺨﻠﯿﺞ اﻟﻌﺮﺑﯿﺔ 
GCC STANDARDIZATION ORGANIZATION (GSO)  
 
 
 
 
 
ﻣﺸﺮوع:  ﻧﮭﺎﺋﻲ 
 
 
 
GSO 02/ FDS/647:2011 
 
  
  
إطﺎرات اﻟﺴﯿﺎرات ﻣﺘﻌﺪدة اﻷﻏﺮاض واﻟﺸﺎﺣﻨﺎت  
واﻟﺤﺎﻓﻼت واﻟﻤﻘﻄﻮرات  
اﻟﺠﺰء اﻟﺜﺎﻟﺚ: اﻟﻤﺘﻄﻠﺒﺎت اﻟﻌﺎﻣﺔ   
MULTI -PURPOSE VEHICLES, TR UCKS,  
BUSES AND TRAILERS TYRES  
PART 3: GENERAL REQUIREMENTS  
 
 
 
 
 
 
 
 
 
إﻋﺪاد 
اﻟﻠﺠﻨﺔ اﻟﻔﻨﯿﺔ اﻟﻔﺮﻋﯿﺔ اﻟﺨﻠﯿﺠﯿﺔ ﻟﻘﻄﺎع ﻣﻮاﺻﻔﺎت اﻟﻤﺮﻛﺒﺎت واﻹطﺎرات 
 
  
ھ
ﻋﺮﺿﺔ ﻟﻠﺘﻐﯿﯿﺮ واﻟﺘﺒ، وﻻ ﯾﺠ
إدارة اﻟﮭﯿﺌﺔ.    
 
ﺗﻘﺪﯾﻢ  
ھﯿﺌﺔ اﻟﺘﻘﯿﯿﺲ ﻟﺪول ﻣﺠﻠﺲ اﻟﺘﻌﺎون ﻟﺪول اﻟﺨﻠﯿﺞ اﻟﻌﺮﺑﯿﺔ ھﯿﺌ 
ﻟﻠﻤﻮاﺻﻟﻤﻮاﺻ
ﺑﻮاﺳﻄﺔ ﻟﺠﺎن ﻓﻨﯿﺔ ﻣﺘﺨﺼﺼﺔ .   
  
وﻗﺪ ﻗﺎﻣﺖ ھﯿﺌﺔ اﻟﺘﻘﯿﯿﺲ ﻟﺪول ﻣﺠﻠﺲ اﻟﺘﻌﺎون ﻟﺪول اﻟﺨﻠﯿﺞ اﻟﻌﺮﺑﯿﺔ ﺿﻤﻦ ﺑﺮﻧﺎﻣﺞ ﻋﻤﻞ اﻟﻠﺠﻨﺔ اﻟﻔﻨﯿ٢-
١  " ﻟﻠﺠﻨﺔ اﻟﻔﻨﯿﺔ اﻟﺨﻠﯿﺠﯿﺔ ﻟﻘﻄﺎع ﻣﻮاﺻﻔﺎت اﻟﻤﺮﻛﺒﺎت واﻹط"  ﺑﺘﺤ
رﻗﻢ ٧٤٦/ ١٦٩٩م،    " إطﺎرات اﻟﺴﯿﺎرات ﻣﺘﻌﺪدة اﻷﻏﺮاض واﻟﺸﺎﺣﻨﺎت واﻟﺤ
اﻟﺜﺎﻟﺚ: اﻟﻤﺘﻄﻠﺒﺎت اﻟﻌﺎﻣﺔ " .وﻗﺎﻣﺖ ﺳﻠﻄﻨﺔ ﻋﻤﺎن ﺑﺈﻋﺪاد ﻣﺸﺮوع ھﺬه اﻟﻤﻮاﺻﻔﺔ .    
  
وﻗﺪ اﻋﺘﻤﺪت ھﺬه اﻟﻤﻮاﺻﻔﺔ ﻛـ)ﻣﻮاﺻﻔﺔ ﻗﯿﺎﺳﯿﺔ  / ﻻﺋﺤﺔ ﻓﻨﯿﺔ( ﺧﻠﯿﺠﯿﺔ ﻓﻲ اﺟﺘﻤﺎع ﻣﺠﻠﺲ إدارة اﻟﮭﯿﺌ)           
( ، اﻟﺬي ﻋﻘﺪ ﺑﺘﺎرﯾﺦ      /      /      ھـ ، اﻟﻤﻮاﻓ/    /      م. ﻋﻠ)    /    (  
وﺗَﺤﻞ ﻣﺤﻠﮭﺎ.  
Foreword 
 
GCC Standardization Organization (GSO) is a regional Organization which 
consists of the National Standards Bodies of GCC me mber States. One of GSO 
main functions is to issue Gulf Standards /Technical regulations through 
specialized technical committees (TCs).  
 
GSO through the technical program of committee TC No  .2-1 "The Gulf technical 
Subcommittee for vehicles and tyres stan dards" has updated the GSO Standard 
No. : 647/٦٩٩١  multi -purpose vehicles, trucks, Buses and trailers tyres  
Part 3: general requirements". The Draft Standard has been prepared by Sultanate 
of Oman.  
  
This standard has been approved as a Gulf (Standard / T echnical Regulation) by 
GSO Board of Directors  in its meeting No.(       ),held on      /    /            H ,     /     
/              G. The approved standard will replace and supersede the GSO standard 
No. (       /      ).    
  
  GSO STANDARD  GSO 647 /  
 
  1MULTI -PURPOSE VEHICLES, TRUCKS,  
BUSES AND TRAILERS TYRES  
PART 3: GENERAL REQUIREMENTS  
 
 
1. SCOPE AND FIELD OF APPLICATION  
 This standard is concerned with general requirements for new tyres for multi -
purpose vehicles, Lig ht Trucks, Heavy Trucks, Buses and trailers. This standard is 
not applicable for tyre types identified by speed category less than 80km/h. It is 
also  not applicable to motor cycle, road equipment or agricultural equipment tyres.  
 
2. COMPLEMENTARY REFERENCES  
2.1 GS 64 5/2009 "Multi -purpose Vehicles, Trucks, Buses  and Trailers Tyres – Part 1 : 
Nomenclature, Designation, Marking, Dimensions, Load Capacity and Inflation 
Pressure ".  
2.2 GS 646/2009 "Multi -purpose Vehicles, Trucks, Buses  and Trailers Tyres  – Part 2 : 
Method of Test”  
 
3. DEFINITIONS  
 Refer to the definiti ons stated in the Gulf standard mentioned in 2.1  
 
4. REQUIREMENTS  
The following shall be met in the tyres of multi -purpose vehicles, trucks, buses and 
trailers.  
4.1 Appearance  
4.1.1 The tyre shall exhibit no visual evidence of tread, sidewall, ply, cord, i nner liner, or 
bead separation, chunking, broken cords, cracking or open splices.  
4.1.2 The tread shall be even and no exposed tyre ply cord shall be visible.  
4.2 Strength  
 The breaking energy of tyres shall not be less than the values specified  in    
Table1.when tested in accordance with the GSO  Standard mentioned in item 2.2.  
4.3 Endurance  GSO STANDARD  GSO 647 /  
 
  24.3.1 No evidence of tread, side wall, ply, cord, inner liner, or bead separation, tread 
chunking, broken cord, cracking or open splices when the tyre subjected to the 
endurance test.  
4.3.2 The outer diameter of the tyre, measured six hours after the endurance test, shall 
not differ by more than 3.5 percent from the outer diameter as measured before the 
test. 
4.3.3 The tyre pressure at the end of the test shall be not le ss than the initial pressure 
specified.  
4.4 Treadwear indicators  
4.4.1 Each tyre shall have at least six traverse rows of treadwear indicators, equally 
spaced around the circumference of the tyre and situated in the principal grooves of 
the tread.  
4.4.2 Tyres designed for mounting on rims of nominal rim diameter code 12 or less, not 
less than four traverse rows of tread wear indicators is acceptable.  
4.5 Speed Symbol  
4.5.1 The speed symbol shall be marked on the tyre, and it shall be as indicated in GSO  
standard mentioned in item 2. 1. 
4.5.2 The tyres fitted on MPV shall be with speed symbol ‘S’ or higher . 
4.5.3 The tyres fitted on buses shall be with speed symbol ‘M’ or higher  
4.5.4   The tyres fitted on Light Truck, marked with prefix ‘LT’ or suffix ‘C’, sha ll be 
with speed symbol ‘L’ or higher  
4.5.5 The tyres fitted on the heavy truck shall be with speed symbol ‘k’ or higher  
4.5.6   The tyres of the category ‘special use ’ (see GSO 645 3.2.3.3) fitted on Light and 
heavy Trucks shall be with speed symbol G or higher  
  
 
5. MARKING  
 The marking of tyres shall be in accordance with the GSO  standard  mentioned in 
item 2.1  
 
6. TESTING  
6.1 Sampling  GSO STANDARD  GSO 647 /  
 
  3 Two tyres with identical characteristics, e.g. size designation and service 
description or maximum load rat ing and speed  capability, shall comprise a test 
sample.  
a) One tyre shall be used for the measurement of strength.  
b) A second tyre shall be used for the endurance test.  
 Each test sample shall conform to the requirements specified in 6.3.1 and  6.3.2. 
6.2 Methods of t est 
 The tests shall be carried out in accordance with GSO  Standard mentioned in item 
2.2. 
6.3      Tests  
 The following tests shall be carried  out on samples taken in accordance with item 
6. 1. 
6.3.1 Visual inspection.  
6.3.2 Dimensions.  
6.3.3 Strength  
6.3.4     Endurance.  
 
7.    CRITERIA OF TECHNICAL CONFORMITY  
7.1 Two months at least before dispatching the consignment of any type of tyres, the 
manufacturer shall send to the Standardization Organization for GCC (GSO) a 
conformity certificate  – in his form al paper – in English and/or Arabic languages, 
certifying that this type of tyres meets the requirements of GSO technical 
regulation for tyres.  The certificate shall include the following (Appendix "A" 
shows an example  of this certificate):  
7.1.1 Designat ion of dimensions, construction, nominal tyre rim diameter and speed 
symbol  
7.1.2    Trade name, trade mark, brand name or manufacturer’s name. . 
7.1.3 Country of production  
7.1.4 Regroovable (if designed)  
7.1.5 Tube type or tubeless   
7.1.6 The production p eriod which shall not be more than one full year.  GSO STANDARD  GSO 647 /  
 
  47.1.7 A guarantee valid for at least one year.  
7.2        The results of tests carried out shall be supplied to GSO.  
 
7.3 The period from the date of manufacture till the date of sale shall not exceed 24 
months for tyres of buses and light trucks, and 30 months for heavy duty truck 
tyres. The dealer or distributor shall give the purchaser a guarantee certificate valid 
for one year at least as from the date of sale and the guarantee shall be applicable 
to tyr es equipped on new cars .  
7.4 The approved conformity certificate shall be valid only for one year from the date 
of approval.  
7.5 In case of Standardization Organization for GCC (GSO) acceptance of the 
certificate mentioned in item 7.1, the type of tyres s hall be considered acceptable.  
7.6 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 the standard  shall be carried out on tyre samples.  
 
 
 GSO STANDARD  GSO 647 /  
 
  5 
Table (1)  
Minimum Static Breaking Energy  
 
 
 
Load 
range  PR Breaking energy min.J  
Rim diameter  
code ≤ 12 Rim diameter  
code 13 and 14  
Tube type  
marked "LT"  Other tyres  
marked "LT"  
Tubeless with  
rim diameter  
code 13 to 17.5  
inclusive  Other tyres  
Tube 
type Tubeless  
A 2 68 - 226 - - 
B 4 136 192 294 - - 
C 6 203 271 362 768 576 
D 8 271 384 514 893 734 
E 10 339 - 576 1 412  972 
F 12 407 - 644 1 785  1412  
G 14 - - 712 2 282  1 695  
H 16 - - 768 2 599  2 090  
J 18 - - - 2 825  2 203  
L 20 - - - 3 051  - 
M 22 - - - 3 220  - 
N 24 - - - 3 390  - 
Note: Rayon cord tyres to be 60% of the values shown.  GSO STANDARD  GSO 647 /  
 
  6 
APPENDIX  (A) 
 
MODEL OF A CERTIFICATE OF CONFORMITY  
FOR MULTI -PURPOSE VEHICLES, TRUCKS  
BUSES  AND TRAILERS TYRES  
 
 
 
Name of  Manufacturer:                                                          Ref .No :  
Country of Production:                                                                    Date      :  
 
To:  GCC Standardization Organization ( GSO)  
 
We hereby certify that the  tyres manufactured by as:  
 
Type.( Tyre Designation/Size)   
Tube/Tubeless :                          Bias/Radial :                      Speed symbol:     
Intended for use in : (multi -purpose vehicles/Light Trucks/Heavy Trucks/Buses/trailers)  
Produced in the  week  No  ……. Year ……..  till the end of week No …….. of 
the year ………….will satisfy the GSO Technical Regulation Nos. ....................  
The production period mentioned in the certificate shall not be more than one full year  
 
Note: All tyres are guaranteed fo r 12 months against manufacturing defects under normal 
operating conditions and with recommended inflation pressure.  
 
Stamp, name and signature of  
responsible person for the  
Concerned department of  
manufacturer