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GB 9743-2024: [Including 2025XG1] Passenger car tyres Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 9743: Historical versions
GB 9743-2024: [Including 2025XG1] Passenger car tyres---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB9743-2024GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.10 CCS G 41 Replacing GB 9743-2015 Passenger car tyres [Including No.1 Amendment 2025XG1] Issued on: APRIL 29, 2024 Implemented on: MAY 01, 2025 Issued by. State Administration for Market Regulation; National Standardization Administration. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Requirements... 6 5 Test methods... 9 6 Judgment rules... 9 7 Signs... 10 8 Implementation of the standard... 11 Appendix A (Normative) Requirements for outer edge dimensions of new tyres ... 12 Appendix B (Normative) Correspondence between tyre speed symbol and maximum driving speed... 13 Appendix C (Normative) Correspondence between tyre load index (LI) and load capacity (TLCC)... 14 No. 1 Amendment [2025 XG1]... 151 ScopeThis 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 referencesThe 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 tyres3 Terms and definitionsThe terms and definitions, which are defined in GB/T 6326, GB/T 4502, GB/T 39971, apply to this document.4 Requirements4.1 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. 4.5 Safety performance 4.5.1 Tyre strength performance Applicable to bias tyres, T-type temporary spare tyres, radial tyres with a nominal aspect ratio of 50 or more. For tyre strength performance test, the destructive energy at each test point shall not be less than the provisions of Table 1. 4.5.2 Unseating resistance of tubeless tyres Applicable to bias tubeless tyres, T-type temporary spare tubeless tyres, radial tubeless tyres with nominal aspect ratio of 50 and above. For tyre unseating resistance test, the unseating resistance at each test point shall not be less than the requirements of Table 2. 4.5.3 Tyre durability After the tyre durability test, the tyre pressure shall not be lower than 95% of the specified initial test pressure; after the test, the appearance inspection shall not have (tread, sidewall, cord layer, belt layer or buffer layer, bead) delamination, cord layer cracks, cord peeling, cord breakage, chunking (except snow tyre PTBC), joint split, cracking, abnormal carcass deformation. If the tyre is damaged, the airtight layer needs to be checked. 4.5.4 Tyre low pressure performance It is applicable to radial tyres, but does not include T-type temporary spare tyres. After the tyre low pressure performance test, the tyre pressure shall not be lower than 95% of the specified initial test pressure; after the test, the appearance inspection shall not have (tread, sidewall, cord layer, airtight layer, belt layer or buffer layer, bead) delamination, cord layer cracks, cord peeling, cord breakage, chunking (except snow tyre PTBC), joint split, cracking, abnormal carcass deformation. 4.5.5 High-speed performance of tyres After the high-speed performance test, the tyre pressure shall not be lower than 95% of the specified initial test pressure; after the test, the appearance inspection shall not show obvious (tread, sidewall, cord layer, airtight layer, belt layer or buffer layer, bead) delamination, cord layer cracks, cord peeling, cord breakage, chunking, joint splitting, cracking, abnormal deformation of the tyre. For tyres with a maximum speed of 300 km/h and above, tread surface blistering or chunking caused by blistering is allowed. 4.6 Tyre rolling resistance It is applicable to radial tyres. However, it does not include tyres which have a rim nominal diameter code ≤ 10 and a rim nominal diameter code ≥ 25, nor does it include spare tyres for temporary use only, special purpose tyres, racing tyres, studded tyres. The rolling resistance coefficient of the tyre shall not be greater than the maximum limit specified in Table 3. 4.7 Relative grip performance of tyre on wet road surface It is applicable to radial tyres, but does not include tyres which have a rim nominal diameter code ≤ 10 and rim nominal diameter code ≥ 25, nor does it include spare tyres for temporary use only, special purpose tyres, racing tyres, studded tyres. The relative grip index of tyre on wet road surface shall not be less than the minimum limit specified in Table 4. 4.8 Tread wear marks and signs 4.8.1 Each tyre cover shall be provided with no less than 4 normally observable tread wear marks, which are at approximately equal distances along the circumference; the height shall be no less than 1.6 mm. 4.8.2 Marks indicating the position of tread wear marks shall be engraved on the shoulders on both sides of each tyre. 4.9 Appearance quality For the appearance quality, the tyre shall not have appearance defects that seriously affect the service life, such as delamination between components, sponginess, broken wire rings, serious pull-up of wire rings, multiple cord breakage, wrinkling of tyre inner cords, rubber edge cords of tyre crown. If a cushion belt is used, the appearance of the cushion belt shall not be incomplete and the belt shall not be cracked.5 Test methods5.1 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 rules6.1 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 4.8.1 and 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 Signs7.1 Each tyre sidewall shall have the following signs. a) Tyre specification sign; b) Trademark; 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 a) ~ 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. 7.7 Reinforced tyres shall be engraved with the reinforced tyre sign. 7.8 Special-purpose tyres shall be engraved with the special-purpose tyre sign. 7.9 Temporary spare tyres shall be engraved with the temporary use sign. 7.10 Passenger car tyres with electronic tags shall have corresponding signs. 7.11 Self-supporting run-flat tyres shall be engraved with the signs specified in GB/T 30196.8 Implementation of the standard8.1 Other clauses in this document except 4.6 and 4.7 shall be implemented for newly produced tyres, from the date of implementation of this document. 8.2 The 4.6 and 4.7 in this document shall be implemented for newly produced tyres, 12 months after the date of implementation of this document.Appendix A(Normative) Requirements for outer edge dimensions of new tyres A.1 Except for T-type temporary spare tyres and bias tyres, the outer edge dimensions of other tyres A.1.1 Maximum and minimum total width of new tyres A.1.2 Maximum and minimum outer diameters of new tyres The maximum outer diameter of a new tyre = 2 × The designed section height of the new tyre × 1.03 + The nominal diameter of the rim; The minimum outer diameter of a new tyre = 2 × The designed section height of the new tyre × 0.97 + The nominal diameter of the rim. The maximum outer diameter of new snow tyres, snow-mud tyres and special-purpose tyres can be increased by 1%. A.2 The outer edge dimensions of T-type temporary spare tyres and bias tyres A.2.1 Maximum total width of a new tyre The maximum total width of a new tyre = The designed section width of the new tyre × 1.07, or the maximum total width of a new tyre = The designed section width of the new tyre + 10 mm, whichever is greater. A.2.2 Maximum outer diameter of a new tyre ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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