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/  1783 :2018  
 
 
 
 
إطارات سيارات الركوب –  درجة مقاومة تأكل المداس (الموطئ) والسحب والحرارة  
Passenger Car Tyres  
Treadware, Traction and Temperature Resistance Grading  
 
 
 
 
   ICS:  83.160.1 0  
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 1783 :2018             GSO STANDARD 
 
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هيئةةة التقيةةي  لةةدو  مجلةة  التعةةاو   لةةدو  الخلةةي  العربيةةة هيئةةة إقليميةةة تضةةم فةة  عضةةويتها أجهةة   التقيةةي  
الوطنيةةة فةةة  الةةدو  الأعضةةةاء، ومةةن مهةةةا  الهيئةةةة إعةةةداد المواصةةفات القياسةةةية واللةةوا ا الفنيةةةة الخليجيةةةة 
بواسطة لجا  فنية متخصصة . 
قةةةةر  المجلةةةة  الفنةةةة  لهيئةةةةة التقيةةةةي  لةةةةدو  مجلةةةة  التعةةةةاو  لةةةةدو  الخلةةةةي  العربيةةةةة فةةةة  اجتماعةةةة   قةةةةةةم ( ) 
الةةةةةةةةةذي عقةةةةةةةةةد بتةةةةةةةةةا ي ......./......./....... هةةةةةةةةةة ، الموافةةةةةةةةة/ ......./...../.......   اعتمةةةةةةةةةاد تحةةةةةةةةةةدي  
اللا حةةةةة الفنيةةةةة الخليجيةةةةة  قةةةةم  GSO 1783 :2018  "إطةةةةا ات سةةةةيا ات الركةةةةو –  د جةةةةة مقاومةةةةة 
تأكةةةةل المةةةةدال (المةةةةوطب) والرةةةةح  والحةةةةرا   " التةةةة  تةةةةم د اسةةةةتها و إعةةةةدادها ضةةةةمن برنةةةةام  عمةةةةل اللجنةةةةة 
الفنيةةةةةة الفرعيةةةةةةة الخليجيةةةةةة  قةةةةةةم TC 02/SC01  " اللجنةةةةةة الفنيةةةةةةة الفرعيةةةةةة الخليجيةةةةةةة لمواصةةةةةةفات
المركبات والإطا ات " المد جة ف  خطة دولة الكويت . 
على أ  تلغ  اللا حة الفنية الخليجية الخليجية  قم GSO 1783 :2006  و تحل محلها 
    
  GSO 1783 :2018             GSO STANDARD 
 
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Passenger Car Tyres  
Treadware, Traction and Temperature Resistance Grading  
 
1-  SCOPE  AND  FIELD  OF APPLICATION  
This  standard   is  concerned   with  the  treadwear,   traction   and  
temperature resistance   grading   of  tyres   for  use  on  passenger   cars  
and  multi-purpose passenger   vehicles.     The temporary  spare  tyres  are 
exempted  from  the require ments of this standard.  
 
2-       COMPLEMENTAR Y REFERENCES  
 
2.1 GSO 48  “Motor Vehicles - Confor mity Certificates”.  
 
2.2 Gulf standard which will be approved by GSO concerned with “Passenger 
Car Tyres - Methods of Testing of Tyre Treadwear”.  
 
2.3 Gulf standard which will be approved by GSO concerned with  “Passenger 
Car Tyres  - Methods of Testing of Tyre Traction Grading”.  
 
2.4 GSO1784 “Passenger Car Tyres  - Methods  of Testing  of Tyre Temperature 
Resistance  Grading”.  
 
2.5            GSO 51 “Passenger Car Tyres - Part 1: Nomenclature, Designation,  
             Marking, Dimensions, Load Capacity and Inflation Pressure”.  
 
2.6           GSO 645 "Multi -purpose Vehicles, T rucks, Buses and Trailers Tyres -             
                   Part 1: Nomenclature, Designation, Marking, Dimensions, Load Capacity                      
                   and Inflation Pressure ".  
 
 
3-       DEFINITIONS  
Refer to the definitions stated in the Gulf standard GSO 51  and GSO 645 , 
which  are mentioned in items 2.5 and 2. 6, respectively.  
3.1             Passenger Car 
A motor vehicle  with a motive  power  designed  to carry  nine persons  and 
their luggage or less including the driver.  
 
3.2 Multi -Purpose Passenger Vehicle  
A motor vehicle,  designed  to carry  ten persons  or less which  is 
constructed either   on  a  truck   chassis   or  with  special   features   for  
occasional   off-road operation.  
 
3.3             Construction  
The internal  structure  of the tyre such as cord  angles,  number and 
place ment of breakers.  GSO 1783 :2018             GSO STANDARD 
 
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3.4             Materials  
The  substances   used   in  manufacture   of  the  tyre  such   as  belt  fiber,   
rubber co mpound, etc.  
 
3.5             Design  
The properties  or conditions  imposed  by the tyre mold, such  as aspect  
ratio, tread pattern, etc.  
3.6             Tread  
The  part  of  a  tyre  which   normally  co mes  in  contact   with  the  ground   
and consists of ribs and grooves.  
 
3.7             Side wall  
The part of a tyre between  the tread  and the bead.  
 
3.8             Ply 
A layer of rubber coated parallel cords.  
 
3.9             Cord  
The stands forming the plies in the tyre.  
 
3.10           Bead separation  
A breakdown of bond between co mponents in the bead area.  
 
3.11           Chunking  
The breaking away of pieces of the tread or side wall.  
 
3.12           Cracking  
Any parting  within  the tread,  side wall or inner  liner of the tyre extending  
to cord  material.  
 
3.13 CT (Special Tyre)  
A pneu matic tyre with an inverted  flange  tyre and rim syste m in which  the 
rim is  designed  with rim flanges  pointed  radially  inward  and the tyre is 
designed  to fit  on the underside  of the rim in a manner  that encloses  the 
rim flanges  inside the air cavity of the tyre.  
 
4-              REQUIREMENTS  
4.1             Infor mation  
4.1.1  Each tyre manufacturer, or each brand name owner  (in the case of ty res 
marketed under a brand name ) shall provide grading information for each 
tyre of which he is the manufacturer or brand name owner in the manner 
set forth below:   
4.1.2  The grades for each tyre shall be only those specified below.  
4.1.3  Each  tyre shall  be graded  with the words, letters,  symbols and figures  
specified below,  permanently  molded  into or onto  the tyre side wall GSO 1783 :2018             GSO STANDARD 
 
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with one of the methods shown in Fig (1).  
4.1.4  Each ty re shall be able to achieve the level of performance represented by 
each grade with which it is labeled. An individual tyre need not, however, 
meet further requirements after having been subjected to the test for any 
one grade .  
4.1.5  Each  tyre shall  have  affixed  to its tread surface  so as not to be easily  
removable a label or labels containing its grades and other infor mation.  
4.1.6  The trea dwear grade attributed to the ty re shall be either imprinted or 
indelibly stamped on the label containing the material, directly to the right 
of or below the word ‘‘TREADWEAR.’’   
4.1.7  The tra ction grade attributed to the ty re shall be indelibly circled in an array 
of the potential grade letters AA, A, B, or C, directly to the right of or below 
the word ‘‘TRACTION ’’. 
4.1.8  The temperature resistance grade attributed to the tyre shall be indelibly 
circled in an array of the potential grade letters A, B, or C, directly to the right 
of or below the word ‘‘TEMPERATURE’’  
4.1.9  The words ‘‘TREADWEAR,’’ ‘‘TRACTION,’’ AND ‘‘TEMPERATURE,’’ in that order, 
may be laid out vertically or horizontally.  
 
4.2             Perfor mance  
4.2.1           Treadwear  
4.2.1.1  Each ty re shall be graded for treadwear performance with the word 
‘‘TREADWEAR’’ followed by a number of two or three d igits representing the 
tyre’s grade for treadwear, expressed as a percentage of the NHTSA 
nominal treadwear value, when tested in accordance with the conditions 
and procedures specified in items 2.2 .  
4.2.1.2  The treadwear  value  shall  be obtain ed when  tested  in accordance  with 
the GSO  standard  mentioned in item 2.2.  
4.2.1.2  Treadwear grades shall be expressed in multiples of 20 (for example, 80, 120, 
160).   
4.2.2           Traction  
4.2.2.1  Each tyre shall be graded for traction performance with the word 
‘‘TRACTION,’’ followed by the symbols AA, A, B, or C, when the tyre is tested 
in accordance with the conditions and procedures specified in paragraph 
2.3.  
4.2.2.2  The traction  perfor mance  shall be obtained  when  tested  in accordance  
with the GSO  standard  mentioned in item 2.3.  GSO 1783 :2018             GSO STANDARD 
 
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TABLE 1  
Tyre Traction Grade Type as a Function of Traction Coefficient  
Traction g rade type  Traction coefficient when  tested on*  
concrete surface  asphalt surface  
C ≤ 0.38  ≤ 0.26  
B > 0.38  > 0.26  
A > 0.47  > 0.35  
AA > 0.54 µ > 0.38 µ 
*The tyre s should be tested  in accordance  with the GSO  standard  mentioned in ite m 2.3. 
 
4.2.2. 3.1 The tyre shall be graded C when the traction coefficient is either:  
▪ 0.38 or less when  tested  in accordance  with the GSO  standard  
mentioned in ite m 4.2.2.2  on the asphalt surface or,  
 
▪ 0.26 or less when  tested  in accordance  with the GSO  standard  
mentioned in  item 4.2.2.2 on the concrete surface.  
4.2.2.3.2  The tyre shall be graded B when the traction coefficient is both:  
▪ More   than   0.38  when   tested   in  accordance   with  the  GSO   
standard mentioned in ite m 4.2.2.2 on the asphalt surface, or 
 
▪ More   than   0.26  when   tested   in  accordance   with  the  GSO   
standard mentioned in ite m 4.2.2.2 on the concrete surface.  
4.2.2.3.3  The tyre shall be graded A when the traction coefficient is both:  
- More   than   0.47  when   tested   in  accordance   with  the  GSO   
standard mentioned in ite m 4.2.2.2 on the asphalt surface, and  
- More   than   0.35  when   tested   in  accordance   with  the  GSO   
standard mentioned in ite m 4.2.2.2 on the concrete surface.  
4.2.2.3.4  The tyre shall be graded AA when the traction coefficien t is both:  
- More  than  0.54 µ when  tested  in accordanc e with the GSO  
standard mentioned in ite m 4.2.2.2 on the asphalt surface, and  
- More  than  0.38 µ when  tested  in accordanc e with the GSO  
standard mentioned in ite m 4.2.2.2 on the concrete surface.  
4.2.3           Temperature resistance  
4.2.3.1  Each  tyre shall  be graded  for tempera ture resistance  perfor mance  with the 
word “TEMPERATURE” fo llowed by the letters A, B or C based on its 
performance when the tyre is tested in accordance with the procedures 
specif ied in item 2. 4.  GSO 1783 :2018             GSO STANDARD 
 
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the tyres  in accordance  with the GSO  standard  mentioned in item 2.4.  
4.2.3. 2 A tyre shall be considered to have successfully completed a test stage in 
accordance with this paragraph if, at the end of the test stage, it exhibits no 
visual evidence of tread, sidewall, ply, cord, innerliner, or bead separation, 
chunking, broken cords,  cracking or open splice and the tyre pressure is not 
less than the pressure specified in GSO 1784/2017 Regulation.   
4.2.3.3  The tyres shall be graded as listed in Table 2  below:  
     TABLE 2  
            Tyre Temperature Grade Type  
The tyre shall  be graded by*  
C B A 
if it fails to complete 
the 500 rpm if it successfully  
completes  the 500 rpm if it successfully  completes  
the 575 rpm 
*The tyres shall be tested as specified  in the GSO  standard  mentioned in item 2.4.  
 
4.2.3.4  The tyre shall  be graded  “C” if it fails to complete the 500 rpm test specified  
in the  GSO  standard  mentioned in item 2.4. in paragraph (g)(9)  
4.2.3.5  The tyre shall  be graded  “B” if it successfully  completes  the 500 rpm test 
specified  in the GSO  standard  mentioned in item 2.4.  
4.2.3.6  The tyre shall  be graded  “A” if it successfully  completes  the 575 rpm test 
specified  in the GSO  standard  mentioned in item 2.4.  
 
5-      LABELLING  AND  MARKING  
Each  tyre shall  be legibly  and indelibl y molded  on to the tyre side wall with 
the following infor mation in either Arabic or English or both languages:  
5.1 Manufacturer’s na me and/or trade mark. 
5.2 The date  of manufacture  in the form of a group  of four numerals,  the first 
two nu mbers showing  the week  and the last two numbers showing  the 
year  of manufacture.  
5.3 Country of manufacture.  
5.4             Treadwear.  
5.5             Traction.  
5.6             Temperature grade.  
 
6-               TESTING  
6.1             Sampling  GSO 1783 :2018             GSO STANDARD 
 
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  deleted paragraphs  A sufficient  number of tyres  shall  be taken from the consign ment and 
subjected to the required tests.  
6.2 Methods of tests  
Tests   shall  be  carried   out  in  accordance   with  the  following   three   GSO 
standards.  
6.2.1  Gulf standard which will be approved by GSO concerned with  “Passenger 
Car Tyres - Methods of Testing of  Tyre Treadwear”.  
6.2.2  Gulf standard which will be approved by GSO concerned with  “Passenger 
Car Tyres  - Methods  of Testing  of Tyre Traction Grading”.  
6.2.3  GSO 1784/20 17 “Passenger Car Tyres  - Methods  of Testing  of Tyre 
Temperature Resistance  Grading”.  
6.3             Tests  
The following  tests  shall be carried  out on the sample withdrawn  in 
accordance with ite m 6.1. 
6.3.1           Visual exa mination.  
6.3.2           Tyre treadwear.  
6.3.3           Tyre traction.  
6.3.4  Tyre te mperature rating.  
 
7- RULES  OF ACCEPTANCE  AND  REJECTION  
7.1 Tyres affixed to the vehicles  
The rules  of acceptance  and rejection  shall be in accordance  with the 
GSO 48/ 1984  “Motor Vehicles - Confor mity Certificates”.  
7.2 Tyres co ming separately as an additional part of a motor vehicle.  
7.2.1  The tyres  shall  be considered  complying with all the require ments of 
this standard when the withdrawn sa mple fro m the consign ment passes the 
tests.  
7.2.2  In case  one or more of the tyres  in the sample fails to pass  any one of the 
tests, a  second  sample double  the number of units  as the first one,  shall  be 
withdrawn fro m the sa me consign ment and subjected to the tests.  
The tyres  shall  be considered  complying  with the require ments of this 
standard when  all the units  of the second  sample pass  the tests,  otherwise  
the tyres  shall be considered non -complying.  
 
 GSO 1783 :2018             GSO STANDARD 
 
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Figure (1)  
Molded Tread wear, Traction and Temperature  
 
 
  
GSO 1783 :2018             GSO STANDARD 
 
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REFERENCES : 
 
1) FMVSS No. 10 4 “Uniform tire quality grading standards ”. 2016