GB/T 2977-2024 Size designation, dimensions, inflation pressure and load capacity for truck tyres
1 Scope
This document specifies the designation methods for tyre size codes, tyre size codes and corresponding dimensions, inflation pressure, load capacity and other relevant requirements for trucks.
This document is applicable to new inflatable tyres of trucks.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6326 Tyre - Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 6326 apply.
4 Designation methods for tyre size codes
4.1 Ultra light and light truck tyres
Examples of tyre size codes for ultra light and light trucks are as follows:
Example 1:
Example 2:
4.2 Truck tyres
Examples of tyre size codes for trucks are as follows:
Example 1:
Example 2:
5 Size codes, dimensions, inflation pressure and load capacity for tyres
5.1 The size code, ply rating, load index, measured rim, new tyre dimension, load capacity and inflation pressure for tyres shall be as specified in Tables 1 to 33; the maximum dimension in service, static load radius, minimum dual spacing, permissible rim and model of inflating valves for tyres should be as specified in Tables 1 to 33; data for other specifications are listed in Annex A.
5.2 The corresponding relations between tyre speed and load change shall be as specified in Table 34. When the load increases, inflation pressure shall be appropriately increased, and the increase ratio shall be settled through negotiation with the manufacturer.
5.3 The corresponding relations between load index and load capacity shall meet the requirements of Annex B.
5.4 The corresponding relations between speed symbols and the maximum driving speed shall meet the requirements of Annex C.
Table 1 Diagonal tyre with ordinary section of ultra light truck (5°rim)
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Designation methods for tyre size codes
5 Size codes, dimensions, inflation pressure and load capacity for tyres
Annex A (Informative) Metric radial ply tyre and FRT tyre of Type C light truck
Annex B (Normative) Corresponding relations between load index and load capacity
Annex C (Normative) Corresponding relations between speed symbols and the maximum driving speed
Annex D (Normative) Requirements for calculation and rounding off of maximum and minimum rolling circumferences of new tyres
