HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189759 (6 Oct 2024)

GB 9743-2024 PDF in English


GB 9743-2024 (GB9743-2024) PDF English
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB 9743-2024English275 Add to Cart 0-9 seconds. Auto-delivery. Passenger car tyres Valid
GB 9743-2015English70 Add to Cart 0-9 seconds. Auto-delivery. Passenger car tyres Valid
GB 9743-2007English70 Add to Cart 0-9 seconds. Auto-delivery. Passenger car tyres Obsolete
GB 9743-1997English265 Add to Cart 0-9 seconds. Auto-delivery. Passenger car tyres Obsolete
GB 9743-1988EnglishRFQ ASK 3 days Radial tyres of passenger car Obsolete
Standards related to (historical): GB 9743-2024
PDF Preview

GB 9743-2024: PDF in English

GB 9743-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.160.10 CCS G 41 Replacing GB 9743-2015 Passenger car tyres ISSUED ON: APRIL 29, 2024 IMPLEMENTED ON: MAY 01, 2025 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 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 Passenger car tyres 1 Scope 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. 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. 4.9 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 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 4.8.1 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 Signs 7.1 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. 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 Maximum total width of new tyres = New tyre design section width × 1.04. Where there is a rim protection line design, the total width shall not exceed 104% of the new tyre section width + 8 mm; Minimum total width of new tyres = New tyre design section width × 0.96. 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 The maximum outer diameter of a new tyre = 2 × The designed section height of the new tyre × 1.07 + The nominal diameter of the rim, or the maximum outer diameter of a new tyre = 2 × (The designed section height of the new tyre + 8 mm) + The nominal diameter of the rim, whichever is greater. The maximum outer diameter of new snow tyres, snow-mud tyres, special purpose tyres can be increased by 1%. ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.