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GB/T 31548-2015 English PDF (GBT31548-2015)

GB/T 31548-2015 English PDF (GBT31548-2015)

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GB/T 31548-2015: Series of electric bicycle tyres

This Standard specifies the terms and definitions, classification, specification marks, basic parameters, main dimensions and measurement methods of electric bicycle tyres. This Standard applies to pneumatic tyres for electric bicycles. This Standard does not apply to non-pneumatic tyres.
GB/T 31548-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.160.10
G 41
Series of electric bicycle tyres
ISSUED ON: MAY 15, 2015
IMPLEMENTED ON: FEBRUARY 01, 2016
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Classification ... 4
5 Specification marks, basic parameters and main dimensions ... 6
6 Measurement method ... 10
Annex A (normative) Calculation of tyre size ... 11
Annex B (informative) Tyres with a new tyre section width (S) exceeding 54 mm - basic parameters and main dimensions ... 14
Series of electric bicycle tyres
1 Scope
This Standard specifies the terms and definitions, classification, specification marks, basic parameters, main dimensions and measurement methods of electric bicycle tyres. This Standard applies to pneumatic tyres for electric bicycles.
This Standard does not apply to non-pneumatic tyres.
2 Normative references
The following referenced documents are indispensable for the application 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 terms and definitions
GB/T 8170, Rules of rounding off for numerical values and expression and judgement of limiting values
GB/T 31580, Series of electric bicycle rims
HG/T 2906, Static loaded performance testing method for cycle tyres
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 6326 as well as the followings apply.
3.1 croctchet type (CT) tyre
Tyres that the bead core of the tyre is made of steel wire or other high-strength materials, and the bead profile shape matches the hook-straight (CT) rim.
4 Classification
Electric bicycle tyres are divided into three categories according to the structural form of the bead and rim fit: croctchet type (CT) tyres (see Figure 1), straight-sided (SS) tyres (see Figure 2), hooked bead (HB) tyres (see Figure 3).
Figure 3 -- Section of hooked bead (HB) tyres
5 Specification marks, basic parameters and main dimensions
5.1 General
Refer to Annex A for the calculation of the main dimensions of croctchet type tyres, straight-sided tyres and hooked bead tyres.
For new tyres with section width (S) exceeding 54 mm, please consult the supporting manufacturer. See Annex B for its basic parameters and main dimensions. Tyres with specifications other than those listed in this Standard can be negotiated by the supplier and the purchaser in accordance with the calculation principles in Annex A. 5.2 Croctchet type (CT) tyres and straight-sided (SS) tyres
5.2.1 Marks for croctchet type tyres and straight-sided tyres
The marks for specifications of croctchet type tyres and straight-sided tyres shall include the following:
a) Nominal section width of tyre (SN) - expressed in millimeters (mm);
b) Tyre structure mark - expressed by ?€?-?€? symbol;
c) Rim nominal diameter (Dr) - expressed in millimeters (mm).
Croctchet type tyres shall be installed on the corresponding hooked straight rims of the Bead core
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