GB 9743-2024 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 9743-2024 | English | 275 |
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[Including 2025XG1] Passenger car tyres
| Valid |
| GB 9743-2015 | English | 70 |
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Passenger car tyres
| Valid |
| GB 9743-2007 | English | 70 |
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Passenger car tyres
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| GB 9743-1997 | English | 265 |
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Passenger car tyres
| Obsolete |
| GB 9743-1988 | English | RFQ |
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Radial tyres of passenger car
| Obsolete |
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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/GB9743-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
CCS G 41
Replacing GB 9743-2015
Passenger car tyres
[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 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
No. 1 Amendment [2025 XG1]... 15
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.
4.5.2 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 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.
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 standard
8.1 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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