GB 9744-2024 English PDF (GB9744-2024)

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GB 9744-2024: Truck tyres
GB 9744-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
CCS G 41
Replacing GB 9744-2015
Truck 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 ... 5
4 Requirements ... 6
5 Test method ... 10
6 Judgment rules ... 10
7 Markings ... 11
8 Implementation of the standard ... 12
Appendix A (Normative) Requirements for outer rim dimensions of new tyres ... 13
Appendix B (Normative) Correspondence between tyre speed symbol and maximum
speed ... 15
Appendix C (Normative) Correspondence between tyre load index (LI) and load
capacity (TLCC) ... 16
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces GB 9744-2015 "Truck tyres". Compared with GB 9744-2015,
in addition to structural adjustments and editorial changes, the main technical changes
are as follows:
- CHANGE the relevant provisions of the main parameters of tyres (see 4.1; 4.1 of
the 2015 edition);
- DELETE the corresponding relationship between speed, air pressure and load (see
4.3 of the 2015 edition);
- ADD the minimum damage energy values of some tyres (see Table 1 and Table 2;
Table 1 and Table 2 of the 2015 edition);
- ADD the tyre rolling resistance requirements (see 4.6);
- ADD the tyre relative grip performance requirements on wet roads (see 4.7);
- DELETE other appearance quality requirements for tyres and fenders (see 4.8.2 of
the 2015 edition);
- ADD tyre rolling resistance performance test methods and test results rounding
requirements (see 5.3);
- ADD the requirements for the test methods and test results of tyre relative grip
performance on wet roads (see 5.4);
- ADD the judgment principles (see Chapter 6);
- DELETE the manufacturer's name or place of origin, exit-factory inspection mark
(see 6.1 of the 2015 edition);
- ADD the requirements for special-purpose tyres, tyres with electronic tags, traction
tyres to have corresponding signs (see 7.8, 7.10, 7.11);
- ADD the implementation requirements of the standard (see Chapter 8).
Please note that some of the contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by AND shall be under the jurisdiction of the Ministry of
Industry and Information Technology of the People's Republic of China.
Truck tyres
1 Scope
This document specifies the requirements, judgment principles, markings and
implementation requirements for truck tyres; describes the relevant test methods.
This document applies to new truck pneumatic tyres.
2 Normative references
The contents of the following documents constitute the essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to that date applies to this document; for undated
references, the latest version (including all amendments) applies 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 4501 Laboratory test methods for truck and bus 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 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 35163 Method for measuring relative wet grip performance of truck and bus
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 and GB/T 39971, apply to
this document.
4 Requirements
4.1 Main parameters of tyres
Tyre specifications, load index, ply, measuring rim, load capacity, inflation pressure,
minimum twin-tyre spacing, permitted rims shall comply with the provisions of GB/T
2977 or relevant industry technical documents.
Note: Complying with relevant industry technical documents refers to any parameter of a truck
tyre that is different from GB/T 2977 and is not within the scope of GB/T 2977.
4.2 New tyre outer rim dimensions
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
4.5.1.1 For the strength performance test of metric series truck tyres, the test destructive
energy at each test point shall not be less than the provisions of Table 1.
If an inner tube and cushion belt are used, the inner tube and cushion belt shall meet the
requirements for matching with the outer tyre.
5 Test method
5.1 The total width and outer diameter of the new tyre after inflation and the height of
the tread wear sign shall be measured in accordance with GB/T 521.
5.2 The tyre strength, durability, high-speed performance of mini and light truck tyres
shall be tested in accordance with GB/T 4501.
5.3 The rolling resistance coefficient of the tyre shall be measured according to the
method specified in GB/T 29040; the result shall be rounded off according to the
provisions of GB/T 8170, with one decimal place retained.
5.4 The relative grip index of the tyre on wet road shall be measured according to the
test method specified in GB/T 35163; the result shall be rounded off according to the
provisions of GB/T 8170, with two decimal places retained.
6 Judgment rules
6.1 Outer edge dimensions, tread wear sign height, wear sign marking, appearance
quality
According to the provisions of GB/T 521, the total width, measure the outer diameter
and tread wear sign height of the test tyre; visually check the wear sign, wear sign
marking, 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
meet the requirements of this document; if the wear sign height meets the provisions of
4.8.1, it is judged that the wear sign height meets the requirements of this document. If
the visually inspected wear signs and wear sign marking 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 they meet the requirements of this document.
6.2 Safety performance
For mini and light truck tyres, carry out the strength performance tests, high-speed
performance tests, durability performance tests in accordance with the requirements of
GB/T 4501. For truck tyres, carry out the strength performance tests and durability
performance tests in accordance with the ...