Series of electric bicycle tyres
1 Scope
This document specifies the classification, size designations, basic parameters, main dimensions and measuring methods of electric bicycle tyres.
This document is applicable to the pneumatic tyres for electric bicycle.
This document is not applicable to non-pneumatic tyres.
2 Normative 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 6326 Tyre - Vocabulary
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 31546 Electric bicycle tyres
GB/T 31580 Series of electric bicycle rims
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 6326 and the following apply.
3.1
croctchet type tyre
tyre with bead core made by steel wire or other high-strength materials, and the shape of bead matching with croctchet type (CT) rim
4 Classification
4.1 Bead structure
Electric bicycle tyres are divided into three categories according to the structure in which the bead and rim fit each other: croctchet type (CT) tyre (see Figure 1 a), straight side (SS) tyres (see Figure 1 b), hooked bead (HB) tyres (see Figure 1 c), and tubeless (TL) tyres (see Figure 1 d).
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Size designations, basic parameters and main dimensions
6 Measuring method of tyres dimensions
Annex A (Normative) Calculation of main dimensions of tyres
Annex B (Informative) New tyres with section width (S) exceeding 54 mm - Basic parameters and main dimensions
