GB/T 29041-2023 English PDF (GBT29041-2023)

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GB/T 29041-2023: Road wear testing methods for motor vehicle tyres
GB/T 29041-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
CCS G 41
Replacing GB/T 29041-2012
Road wear testing methods for motor vehicles tyres
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: JULY 01, 2024
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Test equipment and its requirements ... 6
5 Test method ... 7
6 Test record and transposition diagram ... 12
Appendix A (Informative) Road wear test record table and transposition diagram of
passenger car tyres ... 13
Appendix B (Informative) Record sheet and transposition diagram for road wear test of
micro/light truck tyre ... 16
Appendix C (Informative) Record sheet and transposition diagram for road wear test of
truck tyre ... 20
References ... 26
Road wear testing methods for motor vehicles tyres
1 Scope
This document describes the test method for testing the road wear performance of
automobile tyres, including test equipment and its requirements, test records,
transposition diagrams.
This document is applicable to the wear comparison test of new passenger car's
pneumatic tyres, micro/light truck's pneumatic tyres, truck pneumatic tyres and their
retreaded tyres.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. For reference documents with dates, only the
versions corresponding to the dates apply to this document; for reference documents
without dates, the latest versions (including all amendments) apply to this document.
GB/T 521 Test methods for measuring peripheral dimensions of tyres
GB/T 2977 Size designation, dimensions, inflation pressure and load capacity for
truck tyres
GB/T 2978 Size designation, dimensions, inflation pressure and load capacity for
passenger car tyres
GB/T 3730.1 Terms and definitions of motor vehicles, trailers and combination
vehicle - Part 1: Types
GB/T 3730.3 Motor vehicles and towed vehicles - Dimensions of vehicles - Terms
and definitions
GB/T 6326 Tyre - Vocabulary
GB/T 7037 Truck retread tyres
GB 9743 Passenger car tyres
GB 9744 Truck tyres
GB/T 14646 Retreaded tyre for passenger car
accuracy of ±5 kPa.
4.4 Wheel load meter or other mass measuring instrument, which has an accuracy of ±5
kg.
4.5 Dynamic balancing machine, which has an accuracy of ±5 g.
4.6 Tread depth gauge or other tread depth measuring instrument, which has an
accuracy of ±0.02 mm.
4.7 Vehicle GPS positioning system.
5 Test method
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
5.2.1 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.
5.2.4.3 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.
5.3 Truck tyres
5.3.1 Test tyre requirements
5.3.1.1 New tyres for testing shall meet the safety performance requirements specified
i...