GSO STANDARD GSO       /
 
 1اﻟﻌﺮﺑﻴﺔ  اﻟﺨﻠﻴﺞ  ﻟﺪول اﻟﺘﻌﺎون  ﻣﺠﻠﺲ  ﻟﺪول اﻟﺘﻘﻴﻴﺲ  هﻴﺌﺔ  
GCC STANDARDIZATION ORGANIZATION (GSO) 
 
    
ﻣﺸﺮوع:  ﻧﻬﺎﺋﻲ  
 
  
GSO/02/FDS /646:2009 
 
 
واﻟﺸﺎﺣﻨﺎت  اﻷﻏﺮاض  ﻣﺘﻌﺪدة  اﻟﺴﻴﺎرات  إﻃﺎرات  
واﻟﻤﻘﻄﻮرات  واﻟﺤﺎﻓﻼت   اﻟﺜﺎﻧﻲ اﻟﺠﺰء:  اﻻﺧﺘﺒﺎر  ﻃﺮق  
MULTI-PURPOSE VEHICLES, TRUCKS, 
BUSES AND TRAILERS TYRES 
PART 2: METHODS OF TEST 
 
 
   
 
  
 
إﻋﺪاد 
 ﻟﻘﻄﺎع اﻟﺨﻠﻴﺠﻴﺔ  اﻟﻔﺮﻋﻴﺔ  اﻟﻔﻨﻴﺔ واﻹﻃﺎراتاﻟﻠﺠﻨﺔ  اﻟﻤﺮآﺒﺎت  ﻣﻮاﺻﻔﺎت  
 
 
                           ﻓﺈﻧﻬ ﻟ ﺑﺸ  واﻟﻤﻼﺣﻈ  اﻟ ﻹﺑ ﺗﻮزﻳﻌﻬ  ﺗ ﺧﻠﻴﺠﻴ  ﻗﻴﺎﺳ  ﻟﻤﻮاﺻ  ﻣﺸ  اﻟﻮﺛﻴﻘ  هﺬﻩ
      ﻳﺠ وﻻ واﻟﺘﺒ  ﻟﻠﺘﻐﻴﻴﺮ  ﻋﺮﺿﺔ                     ﻣﺠﻠ  ﻣ اﻋﺘﻤﺎده  ﺑﻌ إﻻ ﺧﻠﻴﺠﻴ  ﻗﻴﺎﺳ  آﻤﻮاﺻ  إﻟﻴﻬ اﻟﺮﺟ  ز
اﻟﻬﻴﺌﺔ إدارة . GSO STANDARD GSO       /
 
 2 
 
ﺗﻘﺪﻳﻢ 
              اﻟﻮﻃﻨﻴ  اﻷﺟﻬ  ﻋﻀ  ﻓ ﺗﻀ إﻗﻠﻴﻤﻴ  هﻴﺌ اﻟﻌﺮﺑﻴﺔ  اﻟﺨﻠﻴﺞ  ﻟﺪول اﻟﺘﻌﺎون  ﻣﺠﻠﺲ  ﻟﺪول اﻟﺘﻘﻴﻴﺲ  هﻴﺌﺔ
  اﻟﻤﻮاﺻ  إﻋ اﻟﻬﻴﺌ ﻣﻬ وﻣ ، اﻟﻌﺮﺑﻴ  اﻟﺨﻠ  دول ﻓ واﻟﻤﻘ  ﻟﻠﻤﻮاﺻ  اﻟﺨﻠﻴﺠﻴ  اﻟﻘﻴﺎﺳ
 ﻣﺘﺨﺼﺼﺔ  ﻓﻨﻴﺔ ﻟﺠﺎن ﺑﻮاﺳﻄﺔ .  
 
       رﻗ اﻟﻔﻨﻴ اﻟﻠﺠﻨ  ﻋﻤﻞ ﺑﺮﻧﺎﻣﺞ  ﺿﻤﻦ اﻟﻌﺮﺑﻴﺔ  اﻟﺨﻠﻴﺞ  ﻟﺪول اﻟﺘﻌﺎون  ﻣﺠﻠﺲ  ﻟﺪول اﻟﺘﻘﻴﻴﺲ  هﻴﺌﺔ ﻗﺎﻣﺖ وﻗﺪ2-
1 "         واﻹﻃ  اﻟﻤﺮآﺒﺎت  ﻣﻮاﺻﻔﺎت  ﻟﻘﻄﺎع اﻟﺨﻠﻴﺠﻴﺔ  اﻟﻔﻨﻴﺔ ﻟﻠﺠﻨﺔ        "   اﻟﺨﻠﻴﺠﻴ  اﻟﻘﻴﺎﺳ  اﻟﻤﻮاﺻ  ﺑﺘﺤ
  رﻗﻢ646 / 1996  م،" إ            اﻟﺘﺠﺎرﻳ  واﻟﻤﺮآﺒ  واﻟﺤ  واﻟﺸ  اﻷﻏ  ﻣﺘﻌ  اﻟﺴ  ﻃ
 اﻟﺜﺎﻧﻲ اﻟﺠﺰء واﻟﻤﻘﻄﻮرات:  اﻻﺧﺘﺒﺎر  ﻃﺮق" . اﻟﻤﻮاﺻﻔﺔ  هﺬﻩ ﻣﺸﺮوع  ﺑﺈﻋﺪاد  ﻋﻤﺎن ﺳﻠﻄﻨﺔ  وﻗﺎﻣﺖ .   
 
    آـ اﻟﻤﻮاﺻﻔﺔ  هﺬﻩ اﻋﺘﻤﺪت  وﻗﺪ   ﺧﻠﻴﺠﻴﺔ  ﻓﻨﻴﺔ ﻼﺋﺤﺔ         رﻗﻢ اﻟﻬﻴﺌﺔ إدارة ﻣﺠﻠﺲ  اﺟﺘﻤﺎع  ﻓﻲ  )          (  ﻋﻘﺪ اﻟﺬي ،  
      ﺑﺘﺎرﻳﺦ    /      /       اﻟﻤﻮاﻓﻖ  ، هـ/    /      م . رﻗﻢ اﻟﻤﻮاﺻﻔﺔ  ﺗُﻠﻐِﻲ أن ﻋﻠﻰ)    /    (  ﻣﺤﻠﻬﺎ وﺗَﺤﻞ . 
Foreword 
 
GCC Standardization Organization (GSO ) is a regional Organization which 
consists of the National Standards Bodi es of GCC member States. One of GSO 
main functions is to issue Gulf St andards /Technical regulations through 
specialized technical committees (TCs).  GSO through the technical program of  committee TC No. 2-1 "The Gulf 
technical Subcommittee for vehicles a nd tyres standards" has updated the GSO 
Standard No. : 646/1996 "multi-purpose vehicl es, trucks, Buses and trailers tyres 
Part 2: methods of test". The Draft Sta ndard has been prepared by Sultanate of 
Oman.   This standard has been approved as a Gulf  Technical Regulation by GSO Board 
of Directors in its meeting No.(       ),held on      /    /            H ,     /     /              
G. The approved standard will replace and supe rsede the GSO standard No. (       
/      ).    GSO STANDARD GSO       /
 
 3 
MULTI-PURPOSE VEHICLES, TRUCKS, 
BUSES AND TRAILERS TYRES 
PART 2: METHODS OF TEST 
 
 
1. SCOPE AND FIELD OF APPLICATION 
 This standard is concerned with met hods of testing new tyres for multi-purpose 
vehicles, Light Trucks, Heavy Trucks, Buse s and trailers. This standard is not 
applicable for tyre types identified by speed category less than 80km/h. 
 
2. COMPLEMENTARY REFERENCES  
2.1 GS 645/2009 "Multi-purpose Vehicles, Trucks , Buses and Trailers Tyres – Part 1 
: Nomenclature, Designation, Marking, Dime nsions, Load Capacity and Inflation 
Pressure ". 
2.2 GS 647/2009 "Multi-purpose Vehicles, Trucks, Buses and Trailers Tyres - Part 3: 
General Requirements". 
 
3. VISUAL INSPECTION  
3.1 Tyres shall be visually inspected to check  for the absence of any cracks or cuts in 
the tread or on either sidewall. Check th e tyre for any uneven shape between the 
side walls, by rotating the tyre on a flat surface. 
3.2 The Tyre shall be visually inspected fo r all the required marking specified in GSO 
technical regulation mentioned in item 2.1 
 
4. DIMENSIONS MEASUREMENT  
4.1 Tyre width  
4.1.1 The tyre shall be mounted on the measur ing rim and inflated to the pressure 
specified by the manufacturer for measuring. 
4.1.2 Prior to measuring, it shall be allowe d to stand for at least 24 h. at room 
temperature. 
4.1.3 The pressure shall be adjusted to the specified value mentioned in item 4.1.1. 4.1.4 The tyre width at its maximum point, excluding elevations due to labelling or 
decoration and other edges band by a calliper, shall then be callipered at six different points equally spaced around the circumference.  
4.1.5 The highest measurements shall be taken as the tyre's width.   GSO STANDARD GSO       /
 
 44.2 Overall diameter 
 The maximum outer circumference shall be measured (under the same conditions 
mentioned in 3. 1) with a steel tape  and then divided by 3.1416 in order to 
calculate the overall diameter, 
 
5. STRENGTH TEST  
5.1 Preparation of tyre 
5.1.1  The tyre shall be mounted on the testing rim and inflated to the pressure specified 
by the manufacturer and corresponding to the maximum load of tyre.  An internal tube may be used in a tubeless tyre for testing convenience. 
5.1.2  The tyre shall be conditioned at room temperature for at least three hours. 5.1.3 The tyre pressure shall be readjusted to the value specified in 5.1.1. 5.1.4 The tread shall be cleaned and dried before the test. 
5.2 Apparatus 
 A plunger with a compressor of a hemispheric steel end, moving vertically at a 
rate of 50 ± 2.5 mm/min., its diameter is chosen according to what is specified in Table (1). 
Table (1) 
Ply Rating and Diameter of Plunger 
Load range*  Diameter of plunger mm  
-   Light Truck 19 
- ≤ 12 rim diameter code 19 
 Tubeless :  
 - ≤ 17.5 rim diameter code 19 
- > 17.5 rim diameter code, Load range F or less 32 
- > 17.5 rim diameter code, load range over F 38 
Tube Type :  
Load range F or less 32 
Load range over F 38 
*  See Table (2). 
 
     GSO STANDARD GSO       /
 
 5Table (2) 
Load Range and the Equivalent Ply Rating 
Load range  Ply rating  
A 2 
B 4 
C 6 
D 8 
E 10 
F 12 
G 14 
H 16 
J 18 
L 20 
M 22 
N 24 
 
5.3 Procedure  
5.3 The plunger shall be forced into the tread as near to the centre line of the tyre as 
possible, avoiding penetration into a tread groove.  Five or three readings in the 
case of tyres of nominal rim diameter 12 or  less of load and penetration at tyre 
break or the plunger is stopped by the ri m ( bottoming of the plunger against the 
rim) shall be made at points equally spaced around the circumference of the tyre. 
 5.4 Calculations 5.4.1 The breaking energy shall be calculated at each point by means of the following 
formula: 
 
F x P 
W = ————————  x  10
–3 
  2 
 Where: 
 W = Energy absorbed at break, N.m  F = Force just before breaking, N  P = Penetration just before breaking, mm. 5.4.2 The breaking energy of the tyre shall be as  the mean value of readings except in 
case the plunger bottoms the rim and the r eading is below the minimum specified 
value at any of the measurement points. GSO STANDARD GSO       /
 
 65.4.3 If, at all of the measuring points, th e plunger bottoms on the rim without breaking 
the tyre, the tyre shall be deemed to have passed the test. 
 
6. ENDURANCE TEST  
6.1 Preparation of tyre 
6.1.1 A new tyre shall be mounted on the test rim. 6.1.2 Inflate the tyre to the pressure specifi ed by the manufacturer for test pressure 
corresponding to the maximum single tyre load. 
6.1.3 The tyre shall be conditioned at a temperature of (38 ± 3)
oC for a period not less 
than 3 hours. 
6.1.4 The inflation pressure shall then be readjusted to the value at which the tyre has 
been previously adjusted as in 6.1.1. 
6.2 Apparatus  
 The apparatus shall consist of the following: 6.2.1 A steel drum (1700 ± 1%) mm in diameter and of at least the same width as the 
tread of the tyre to be tested. 
6.2.2 A spindle on which rim and tyre shall be mounted provided with a means for 
loading the tyre against the test drum. 
6.2.3 A means for rotating the spindle of the drum within the specified testing speeds. 6.2.4 A means for measuring the radial forces at  the spindle of the rim and the tyre at 
different speeds during the test. 
 
6.3 Procedure 
6.3.1 The tyre and the rim shall be mounted on the test axle. 6.3.2 The test room temperature shall be controlled at (38 ± 3)
oC during the test. 
6.3.3 If the tyre has load capacity indices for both single and twined utilization, the 
reference load for single utilization shall be taken as the basis for the test load. 
6.3.4 The test shall be carried out at the speeds and loads mentioned in Table (3) shown 
below for tyres with speed category symbol P and less than P. 
        GSO STANDARD GSO       /
 
 7Table (3) 
ENDURANCE TEST PROGRAMME 
Load index Tyre speed 
category Test-drum speed Load placed on the wheel as 
a percentage of the load 
corresponding to the load 
index 
  Radial-ply 
 
rpm Diagonal 
(bias-ply) 
rpm 7 h. 16 h. 24 h. 
122 or more J 
 
K 
 
L 
 
M 150 
 
175 
 
200 
 
225 125 
 
150 
 
- 
 
- 
J 
K 150 
175 150 
175 66% 84% 101% 
L 200 175 70% 88% 106% 
4 h 6 h 24 h  
 
121 or less 
 
 
M 
N 
P  
 
250 
275 300  
 
200 
- - 75% 97% 114% 
 
6.3.5 In the case of tyres with speed category symbol above P, the test procedures shall 
be as shown on item 6.3.8 
6.3.6 The tyre pressure shall not be corrected through out the test and the test load 
should be kept constant throughout each stages. 
6.3.7 The endurance test shall be carried out without interruption. 
 
6.3.8 Endurance test for tyre with speed category symbol Q and above 
 
  This procedure applies to: 
 
6.3.8.1 Tyres marked with load capacity index in single 121 or less. 
 
6.3.8.2 Tyres marked with load capacity index in single 122 and above and with the 
additional marking "C", or "LT". 
 
6.3.8.3 The load shall be placed on the wheel as a percentage of the load corresponding to the 
load index: 
 
6.3.8.3.1 90% when tested on a test drum 1.70 m ±1 percent in diameter; 
 GSO STANDARD GSO       /
 
 86.3.8.3.2 92% when tested on a test drum 2.0 m ± 1 percent in diameter. 
 
6.3.8.4 Initial test speed: Speed corresponding to the speed category symbol less 20 km/h for 
20 min  
 6.3.8.5 Second test speed: Speed corresponding to the speed category symbol less 10 km/h 
for 10min 
 6.3.8.6 Final test speed: speed corresponding to the speed category symbol for 30 min.   
6.3.8.7 Total test duration shall be 1 h.