GB/T 29041-2023Road wear testing methods for motor vehicle tyres (English PDF)

5.1 Passenger car tyres

5.1.1 Test tyre requirements

5.1.1.1 New tyres for testing shall meet the safety performance requirements specified in GB 9743.

5.1.1.2 Retreaded tyres for testing shall meet the safety performance requirements specified in GB/T 14646.

5.1.1.3 The rubber residue on the tyre tread (air vent rubber column, flash) should be removed and trimmed for the test tyres.

5.1.2 Selection of test road

The test road can be selected according to the test purpose.

5.1.3 Test vehicle requirements

5.1.3.1 The manufacturers and models of vehicles in the same convoy shall be the same; they shall have the same drive system, brake system, suspension system.

5.1.3.2 The load carried by each tyre for the test shall be 60% ~ 70% of the load capacity specified in GB/T 2978 or relevant industry technical documents.

5.1.3.3 After the vehicle is loaded as required, it shall be parked for at least 24 hours. If the suspension system is abnormal during this period, the vehicle cannot be used for testing.

5.1.3.4 Before starting the test, the test vehicle shall be subjected to complete maintenance. If any abnormality is found, it shall be recorded and corrected, to ensure the normal operation of the vehicle.

5.1.3.5 After each tyre trans-position and before the test, the test vehicle shall be subjected to daily maintenance. If any abnormality is found, it shall be recorded and corrected, to ensure the normal operation of the vehicle.

5.1.3.6 Test tyres of the same brand, specification, structure, pattern shall be installed on the same axle of the test vehicle.

5.1.3.7 Install the test tyre on the rim specified in GB/T 2978 or relevant industry technical documents; inflate it. The inflation pressure of standard tyres is 250 kPa ± 5 kPa; the inflation pressure of reinforced tyres is 290 kPa ± 5 kPa.

5.1.3.8 Before each test after transposition, the tyre-rim assembly shall be subjected to dynamic balancing test; the balance block shall be re-adjusted and recorded.

5.1.4 Test procedure

5.1.4.1 The total test mileage should be 25500 km ± 30 km (the first 1500 km is the running-in period). After the running-in period, transposition should be performed according to 5.1.4.3 every 3000 km ± 30 km.

5.1.4.2 The tread depth shall be measured according to GB/T 521 before the test, after running-in, and at each transposition.

5.1.4.3 The test tyre transposition should be in a rear cross pattern, that is, the tyre on the front axle of the test vehicle shall be trans-positioned to the wheel position on the other side of the rear axle of the vehicle; the tyre on the rear axle shall be trans-positioned to the front axle on the same side of the next vehicle in the convoy; the tyre on the rear axle of the last test vehicle in the convoy shall be trans-positioned to the front axle on the same side of the first test vehicle in the convoy. If there is only one test vehicle, the tyre transposition is only performed on this vehicle during the entire test. The test vehicles shall maintain the same order in the convoy during the entire test.

5.1.4.4 The test vehicle shall travel at a speed of 0 km/h ~ 120 km/h, of which at least 45% of the distance shall be traveled at a speed of 60 km/h ~ 120 km/h. The test vehicles in the same convoy shall travel on the same route and at the same speed as much as possible.

5.2 Micro/light truck tyres

5.2.4.3 The transposition of the test tyres should be rear cross, that is, the tyres on the front axle of the test vehicle shall be trans-positioned to the wheel position on the other side of the rear axle of the vehicle; the tyres on the rear axle shall be trans-positioned to the front axle on the same side of the next vehicle in the convoy; the tyres on the rear axle of the last test vehicle in the convoy shall be trans-positioned to the front axle on the same side of the first test vehicle in the convoy. If there is only one test vehicle, the tyre transposition will be carried out only on that vehicle during the entire test. The test vehicles shall maintain the same order in the convoy during the entire test.

5.2.4.4 The test vehicle shall travel at a speed of 0 km/h ~ 120 km/h, of which at least 45% of the distance shall be traveled at a speed of 60 km/h ~ 120 km/h. Test vehicles in the same convoy shall travel on the same route and at the same speed as far as possible.

5.2.1 Test tyre requirements

5.2.1.1 New tyres for testing shall meet the safety performance requirements specified in GB 9744.

5.2.1.2 The retreaded tyres used for the test shall meet the safety performance requirements specified in GB/T 7037.

5.3 Truck tyres

5.3.1 Test tyre requirements

5.3.1.1 New tyres for testing shall meet the safety performance requirements specified in GB 9744.

5.3.1.2 The retreaded tyres used for the test shall meet the safety performance requirements specified in GB/T 7037.

5.3.1.3 The rubber residue on the tyre tread (air vent rubber column, flash) etc. should be removed and trimmed for the test tyres.

5.3.2 Test road

The test road can be selected according to the purpose of the test.

5.3.3 Test vehicle requirements

5.3.3.1 The vehicles in the same convoy shall be of the same manufacturer and model; they shall have the same drive system, brake system, suspension system.

5.3.3.2 The vehicle used for the test shall be rear-wheel drive. Ordinary trucks or semi-trailer tractors and semi-trailers shall be used as test vehicles. If a semi-trailer tractor is used for the test, the test vehicle shall have the same or similar wheelbase, suspension, drive system; the semi-trailers used shall be the same. When the test vehicle is equipped with dual tyres, the test tyres shall be installed on the outer tyre position. The load on each wheel shall be 90% ~ 95% of the maximum load of a single tyre, which is specified in GB/T 2977 or relevant industry technical documents.

5.3.3.3 After the test vehicle is loaded as required, it shall be parked for at least 24 hours.

If the suspension system is abnormal during this period, the vehicle cannot be used for testing.

5.3.3.4 Before starting the test, the test vehicle shall be subjected to complete maintenance. If any abnormality is found, it shall be recorded and corrected, to ensure the normal operation of the vehicle.

5.3.3.5 After each tyre transposition and before the test, the test vehicle shall be subjected to daily maintenance. If any abnormality is found, it shall be recorded and corrected, to ensure the normal operation of the vehicle.

5.3.3.6 Test tyres of the same brand, specification, structure, pattern shall be installed on the same axle of the test vehicle.

5.3.3.7 Install the test tyre on the rim specified in GB/T 2977 or relevant industry technical documents; inflate it according to the inflation pressure corresponding to the maximum load of a single tyre.

5.3.3.8 Before each test after transposition, the tyre-rim assembly shall be subjected to a dynamic balance test; the balance block shall be re-adjusted and recorded.

5.3.4 Test procedure

5.3.4.1 The total test mileage should be 52500 km ± 30 km (the first 2500 km is the running-in period). After the running-in period, transposition shall be performed according to 5.3.4.3 every 5000 km ± 30 km.

5.3.4.2 The tread depth shall be measured according to GB/T 521 before the start of the test, after the running-in period, and at each transposition.

5.3.4.3 The test tyre on the driving axle can only be trans-positioned between the driving axles; the test tyre on the driven axle can only be trans-positioned between the driven axles. Each test tyre shall be trans-positioned to a different wheel position on the same functional axle during each tyre transposition period of the test; each test tyre shall be trans-positioned to a different wheel position on the same functional axle at the end of each specified transposition period. The transposition form should be rear cross rotation form, that is, the tyre on the front axle of the test vehicle shall be trans-positioned to the wheel position on the other side of the rear axle of the vehicle, the tyre on the rear axle shall be trans-positioned to the front axle of the same functional axle on the same side of the next vehicle in the queue; the tyre on the rear axle of the last test vehicle in the convoy shall be trans-positioned to the front axle of the same functional axle on the same side of the first test vehicle in the convoy. If there is only one test vehicle, the tyre transposition is only performed on this vehicle during the entire test. The convoy shall maintain the same order during the entire test process.

5.3.4.4 The test vehicle shall travel at a speed of 0 km/h ~ 100 km/h, of which at least 60% of the distance shall be traveled at a speed of 40 km/h ~ 100 km/h. The test vehicles in the same convoy shall travel on the same route and at the same speed as much as possible. […]