GB 9743-2024Passenger car tyres (English PDF)

1 Scope

GB 9743-2024 is the Chinese national standard on passenger car tyres, in the field of rubber and plastic industries. It carries no /T suffix, which in the Chinese system means compliance is mandatory: a product or a practice within its scope has to meet it to be lawfully made, sold or carried out in China. It was issued on 29 April 2024 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 May 2025. Classification: ICS 83.160.10, CCS G41. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document specifies the requirements, judgment principles, markings, implementation requirements of the standard for passenger car tyres; describes the relevant test methods. This document applies to new passenger car pneumatic tyres.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for referenced documents with dates, only the version corresponding to that date applies to this document; for referenced documents without dates, the latest version (including all amendments) applies to this document.

GB/T 521 Test methods for measuring peripheral dimensions of tyres

GB/T 2978 Size designation, dimensions, inflation pressure and load capacity for passenger car tyres

GB/T 4502 Laboratory test methods for passenger car tyres capabilities

GB/T 6326 Tyre - Vocabulary

GB/T 8170 Rules of rounding off for numerical values and expression and judgement of limiting values

GB/T 21910 Method for measuring relative wet grip performance of passenger car tyres

GB/T 29040 Test methods of rolling resistance for motor vehicle tyres - Single point test and correlation of measurement results

GB/T 29042 Thresholds and grading of rolling resistance for motor vehicle tyres

GB/T 30196 Self-supporting run flat tyres

GB/T 39971 Thresholds and grading of relative wet grip index for motor vehicle tyres

3 Terms and definitions

The terms and definitions, which are defined in GB/T 6326, GB/T 4502, GB/T 39971, apply to this document.

4 Requirements

4.1 Main parameters of tyres Tyre specifications, load index or ply, measuring rim, load capacity, inflation pressure, permitted rim shall comply with the provisions of GB/T 2978 or relevant industry technical documents.

Note. Complying with relevant industry technical documents refers to passenger car tyres with any parameter different from GB/T 2978 and not within the scope of GB/T 2978.

4.2 Outer rim dimensions of new tyres The total width and outer diameter of the tyre section shall comply with the provisions of Appendix A.

4.3 Correspondence between tyre speed symbol and maximum driving speed The correspondence between tyre speed symbol and maximum driving speed shall comply with the provisions of Appendix B.

4.4 Correspondence between tyre load index and load capacity The correspondence between tyre load index and load capacity shall comply with the provisions of Appendix C.

5 Test methods

5.1 The total width and outer diameter of the new tyre after inflation and the height of the tread wear mark shall be measured in accordance with GB/T 521.

5.2 Tyre strength, tubeless tyre unseating resistance, durability, low pressure performance, high speed performance shall be tested in accordance with GB/T 4502.

5.3 The rolling resistance of the tyre shall be measured in accordance with the method specified in GB/T 29040; the results shall be rounded off in accordance with the provisions of GB/T 8170, with one decimal place retained.

5.4 The wet road grip performance of the tyre shall be measured in accordance with the test method specified in GB/T 21910; the results shall be rounded off in accordance with the provisions of GB/T 8170, with two decimal places retained.

5.5 The appearance quality shall be inspected by visual inspection.

6 Judgment rules

6.1 Outer edge dimensions, tread wear mark height, wear sign, appearance quality According to the provisions of GB/T 521, measure the total width, outer diameter, tread wear mark height of the test tyre; visually check the wear mark, wear sign, appearance quality. If the measured total width and outer diameter of the tyre meet the corresponding provisions of 4.2, it is judged that the outer edge dimensions of this item meet the requirements of this document; if the wear mark height meets the provisions of 4.8.1, it is judged that the wear mark height meets the requirements of this document; if the visually inspected wear marks and wear sign meet the provisions of

4.8.2 respectively, then the appearance quality meets the provisions of 4.9, it is judged that it meets the requirements of this document.

6.2 Safety performance According to the requirements of GB/T 4502, the test tyre is subjected to strength performance test, bead unseating resistance test, durability test, low air pressure performance test, high-speed performance test. If the test results meet the corresponding provisions of 4.5, it is judged that the performance meets the requirements of this document. For the strength test, if the tyre touches the rim but is not punctured, meanwhile it does not reach the minimum damage energy value, THEN, the test point is also considered to have "passed the test"; for the bead unseating test, if the tyre does not unseat but slips or touches the rim, it is also considered to have "passed the test".

6.3 Rolling resistance According to the provisions of GB/T 29040, measure the rolling resistance of the test tyre; calculate its rolling resistance coefficient; calculate the judgment value according to the provisions of GB/T 29042.If the judgment value reaches the provisions of 4.6, it is judged that the rolling resistance coefficient meets the limit requirements specified in this document. During the production consistency check, the limit judgment value of the tyre rolling resistance coefficient shall not be greater than the limit plus

0.3 N/kN.

6.4 Relative grip performance on wet roads According to the provisions of GB/T 21910, measure the relative grip index of the test tyre on wet roads. If the test result reaches the provisions of 4.7, it is judged that the relative grip index on wet roads meets the limit requirements. During the production consistency check, the limit judgment value of the relative grip index of the tyre on wet roads shall not be lower than the limit requirements.

7 Signs

7.1 Each tyre sidewall shall have the following signs.

a) Tyre specification sign;

c) Load index or ply, load capacity, inflation pressure;

d) Speed symbol;

e) Name of the frame material and the number of ply used for the crown and sidewall of radial tyres; name of the frame material used for bias tyres;

f) Sign of the location of the tread wear mark;

g) Production number. Items

f) are engraved signs; item

g) is a permanent sign.

7.2 Radial tyres shall be engraved with the "RADIAL" sign; tubeless tyres shall be engraved with the "TUBELESS" sign.

7.3 Tyres with directional patterns shall be engraved with the driving direction sign.

7.4 For tyre assembly, if the sidewall has inner and outer side requirements, the side assembled on the outer side shall be engraved with the "OUTSIDE" sign.

7.5 Snow-mud tyres shall be engraved with the snow-mud tyre sign.

7.6 Snow tyres shall be engraved with the snow tyre sign.

Appendix A

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