هيئت التقييس لذول مجلس التعبون لذول الخليج العربيت 
GCC STANDARDIZATION ORGANIZATION (GSO)  
 
 
 
 
 
هشزوع:  ًهبئً 
 
 
 
GSO 02/ FDS/647:2013 
 
 
 
إطبراث السيبراث متعذدة الأغراض والشبحنبث
والحبفلاث والمقطوراث 
الجزء الثبلث: المتطلببث العبمت   
MULTI -PURPOSE VEHICLES, TR UCKS,  
BUSES AND TRAILERS TYRES  
PART 3: GENERAL REQUIREMENTS  
 
 
 
 
 
 
 
 
 
إعذاد 
اللجٌت الفٌٍت الفزعٍت الخلٍجٍت لقطبع هىاصفبث الوزكببث والإطبراث 
 
 
هذٍ الىثٍقت هشزوع لوىاصفت قٍبسٍت خلٍجٍت حن حىسٌعهب لإبذاء الزأي والولاحظبث بشأًهب، لذلك فإًهب 
عزضت للخغٍٍز والخبذٌل، ولا ٌجىس الزجىع إلٍهب كوىاصفت قٍبسٍت خلٍجٍت إلا بعذ اعخوبدهب هي هجلس 
إدارة الهٍئت.   
 
  
 
تقذيم
هٍئت الخقٍٍس لذول هجلس الخعبوى لذول الخلٍج العزبٍت هٍئت إقلٍوٍت حضن فً عضىٌخهب الأجهشة الىطٌٍت 
للوىاصفبث والوقبٌٍس فً دول الخلٍج العزبٍت ، وهي ههبم الهٍئت إعذاد الوىاصفبث القٍبسٍت الخلٍجٍت 
بىاسطت لجبى فٌٍت هخخصصت .  
 
وقذ قبهج هٍئت الخقٍٍس لذول هجلس الخعبوى لذول الخلٍج العزبٍت ضوي بزًبهج عول اللجٌت الفٌٍت رقن 2-
1 "  للجٌت الفٌٍت الخلٍجٍت لقطبع هىاصفبث الوزكببث والإطبراث"  بخحذٌث الوىاصفت القٍبسٍت الخلٍجٍت 
رقن 647 / 1996م،" إطبراث السٍبراث هخعذدة الأغزاض والشبحٌبث والحبفلاث والوقطىراث الجشء 
الثبلث: الوخطلببث العبهت " .وقبهج سلطٌت عوبى بإعذاد هشزوع هذٍ الوىاصفت .   
 
وقذ اعخوذث هذٍ الوىاصفت كـ(هىاصفت قٍبسٍت  / لائحت فٌٍت) خلٍجٍت فً اجخوبع هجلس إدارة الهٍئت رقن  (           
) ، الذي عقذ بخبرٌخ      /      /      هـ ، الوىافق    /    /     م. على أى حُلغًِ الوىاصفت رقن (    /     ) 
وحَحل هحلهب.  
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/ 1996  "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   /   
 
 1 MULTI -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.  GSO STANDARD  GSO   /   
 
 2 4.3 Endurance  
4.3.1 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  GSO STANDARD  GSO   /   
 
 3 6.1 Sampling  
 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   GSO STANDARD  GSO   /   
 
 4 7.1.6 The production p eriod which shall not be more than one full year.  
7.1.7 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   /   
 
 5  
Table (1)  
Minimum Static Breaking Energy  
 
Breaking Energy:   Joules (J )  
Tire  Characteristics  Rim 
diameter 
code ≤  12  All Tyres marked ‘LT’ 
or ‘C’ [TL or TT] ; 
Tyres of  rim 
diameter code > 12 
& ≤ 17.5 [TL or TT]  All other Tyres of rim diameter code > 17.5  
Tube Type (TT) tyre   Tubeless (TL) tyre  
Plunger   mm mm mm mm mm mm 
Diameter  19 19 32 38 32 38 
Minimum Breaking 
Energy, function of the   J J J J J J 
Load 
Range  Ply Rating              
A 2 67 225         
B 4 135 293         
C 6 203 361 768   576   
D 8 271 514 892   734   
E 10 338 576 1412    971   
F 12 406 644 1785    1412    
G 14   711   2282    1694  
H 16   768   2598    2090  
J 18       2824    2203  
L 20       3050      
M 22       3220      
N 24       3389      
 
Note: Rayon cord tyres to be 60% of the values shown.  GSO STANDARD  GSO   /   
 
 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 for 12 months against manufacturing defects under normal 
operat ing conditions and with recommended inflation pressure.  
 
Stamp, name and signature of  
responsible person for the  
Concerned department of  
manufacturer