GB 9744-2024 Truck tyres
1 Scope
This document specifies the requirements, judgment rules, and marking for truck tyres, as well as the requirements for the implementation of this standard; the relevant test methods are also included.
This document is applicable to new pneumatic truck tyres.
2 Normal references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 track and bus tyres capabilities
GB/T 6326 Tyre - Vocabulary
GB/T 8170 Rules of rounding off for numerical values & expression and judgment 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
For the purposes of this document, the terms and definitions given in GB/T 6326 and GB/T 39971 apply.
4 Requirements
4.1 Main parameters of tyres
Tyre size, load index, ply rating, measuring rim, load-carrying capacity, inflation pressure, minimum dual spacing and permitted rim shall meet the requirements of GB/T 2977 or relevant technical documents of the industry.
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Note: The requirement “shall meet the requirements of relevant technical documents of the industry” is applicable to truck tyres with any parameter that differs from those in and is not covered by GB/T 2977.
4.2 Peripheral dimensions of new tyres
The overall width and outer diameter of the tyre section shall meet the requirements of Annex A.
4.3 Corresponding relations between speed symbols and the maximum speed of tyres
The corresponding relations between speed symbols and the maximum speed of tyres shall meet the requirements of Annex B.
4.4 Corresponding relations between tyre load index and tyre load-carrying capacity
The corresponding relations between tyre load index and tyre load-carrying capacity shall meet the requirements of Annex C.
4.5 Safety performance
4.5.1 Tyre strength performance
Foreword i
1 Scope
2 Normal references
3 Terms and definitions
4 Requirements
5 Test methods
6 Judgment rules
7 Marking
8 Implementation of this standard
Annex A (normative) Peripheral dimensions requirements for new tyres
Annex B (Normative) Corresponding relations between speed symbols and the maximum speed of tyres
Annex C (Normative) Corresponding relations between tyre load index (LI) and tyre load-carrying capacity (TLCC)
