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/  1784 :2018  
 
 
 
 
إطارات سيارات الركوب  طرق اختبار درجة مقاومة الإطار للحرارة  
 
Passenger Car Tyres:  
Methods of Testing of Tyre  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 1784 :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 1784 :2018  "إطةةةةا ات سةةةةيا ات الركةةةةو  طةةةةر  اختبةةةةا  د جةةةةة
مقاو مةةةةةةة الإطةةةةةةا  للحةةةةةةرا   " التةةةةةة  تةةةةةةم د اسةةةةةةتها و إعةةةةةةدادها ضةةةةةةمن برنةةةةةةام  عمةةةةةةل اللجنةةةةةةة الفنيةةةةةةة الفرعيةةةةةةة 
الخليجيةةةةة  قةةةةم TC 02/SC01  " اللجنةةةةة الفنيةةةةة الفرعيةةةةة الخليجيةةةةة لمواصةةةةفات المركبةةةةات والإطةةةةا ات 
" المد جة ف  خطة دولة الكويت . 
على أ  تلغ  اللا حة الفنية الخليجية الخليجية  قم GSO 1784 :2006  و تحل محلها 
   
 
  GSO 1784 :2018             GSO STANDARD 
 
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Passenger Car Tyres  
Methods of Testing of Tyre Temperature Resistance Grading  
 
1-  SCOPE  AND  FIELD  OF APPLICATION  
This standard  is concerned  with the methods  of testing  of tyres  for 
temperature resistance grading.  
 
2-              COMPLEMENTAR Y REFERENCES  
2.1 GSO 1783  “Motor  Vehicles  Tyres  - Treadwear,  Traction  and Temperature 
Resistance Grading”.  
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”.  
 
3-              VISUA L INSPECTION  
Tyres shall be visually inspected to check the following:  
3.1 The absence  of any cracks  or cuts in the tread  or on sidewalls,  and 
ensures  it is free from any metal pieces,  gravel  or other  foreign  matter  
pinched or stuck in the tyre.  
3.2 Infor mation  marked  on the tyre such  as treadwear  grade,  traction  and 
temperature grade.  
3.3 Date of manufacture.  
3.4 Country of manufacture.  
 
4-              MEASURIN G INSTRUMENTS  
4.1 Time measuring instru ments:  
It shall per mit measure ments of ti me to an accuracy of ( ± 0.001) second.  
4.2 Temperature measuring instru ments:  
It shall per mit measure ments of temperature to an accuracy of (± 1oC). 
4.3 Pressure measuring instru ments:  
Pressure dial gauges to an accuracy of ± 2 kPa.  GSO 1784 :2018             GSO STANDARD 
 
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5.1 Preparation of T yre 
5.1.1  The tyre shall  be mounted  on the rim and inflate  it to the applicable  
pressure specified in Table 1 shown below.  
5.1.2  The tyre and the rim asse mbly shall be conditioned  to a temperature of 
38oC to 4 4oC and not less than 38oC for at least 3 hours.   
5.1.3  The tyre pressure  shall be adjusted  again to the applicable  inflation  
pressure specified in the table 1.  
5.2             Apparatus  
5.2.1  A flat-faced  steel  drum in diameter and at least  the same width  as the 
section width of the tyre to be tested.  
5.2.2  A test room controlled  at a temperature  not less than  38oC during  the 
test period.  
5.2.3           Temperature sensors.  
5.2             Test Procedure  
5.2.1 The tyre ri m asse mbly shall be mounted on the test axle.  
 
TABLE  (1) 
Test Inflation Pressures  
Test Type  Tyres other than CT tyres  CT Tyres  
PSI kPa kPa 
32 36 40 60 240 280 300 340 350 290 330 350 390 
Treadwear  
test 24 28 32 52 180 220 180 220 180 230 270 230 270 
Temperature  
resistance test 30 34 38 58 220 260 220 260 220 270 310 270 310 
 
5.2.2 The tyre tread shall be pressed against the surface o f a flat -faced steel test 
wheel that is (1.7 m) in diameter and at least as wide as the section width of 
the ty re. 
5.2.3 The temperature  sensor  shall  be located  so that its readings  are not 
affected  by heat  radiation  drafts,  variations  in the temperature  of the 
surrounding  air or guards or other devices.  
5.2.4 During  the test the inflation  pressure  (Table  1) and the temperature  of 
the a mbient  air measured  at (300 ± 2) mm from the edge of the rim flange  GSO 1784 :2018             GSO STANDARD 
 
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maintained  as indicated  in item 5. 1.2. 
5.2.5 Then  pressed  the tyre against  the test wheel  with a load  of 88% of the 
tyre’s maximum load rating as marked on side wall.  
5.2.6 The test wheel shall be rotated at 250 rp m for two (2) hours.  
5.2.7 Remove the load, allow  the tyre to cool  to temperature  not less than 38oC 
or for 2 hours, whichever occurs last and readjust the inflation pressure shall 
then be readjusted to the initial pressure specified in Table 1.  
5.3.8  inflation pressure shall then be readjusted to the initial pressure . 
5.2.8 The test shall  be continued  with the load  applied  and without  interruption  
or readjust ment of inflation  pressure,  with the test wheel  rotation  at 375 rpm 
for 30 minutes.  
5.2.9 at the end of 30 minutes  increases  the rotation  of the test wheel  by another  
25 rp m for another 30 minutes.  
5.2.10 Increase  the rotation  by 25 rpm every  1/2 hour  until the tyre has run at 575 
rpm for 30 minutes or to failure whichever occurs first.  
5.3             Result  
5.3.1 The tyre shall  be checked  for evidence  of bead  separation,  tread  
chunking, broken  cords,  cracking  or open splices after every test at  250 
rpm, 375 rpm, 400 rp m, until 575 rp m. 
5.3.2 The tyre shall be graded “C” if it fails to co mplete the 500 rp m test. 
5.3.3 The tyre shall be graded “B” if it successfully co mplete s the 500 rp m test. 
5.3.4 The tyre shall be graded “A” if it successfully co mpletes the 575 rp m test. 
5.3.5  The temperature grade for this tyre is established for a tyre that is properly 
inflated and not overloaded. Excessive speed, underinflation, or excessive 
loading, either separately or in combination, can cause heat buildup and 
possible tyre failure.  
  GSO 1784 :2018             GSO STANDARD 
 
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1) FMVSS No. 104 “ Uniform tire quality grading standard s”. 2016