GB/T 31548-2023Series of electric bicycle tyres (English PDF)
电动自行车轮胎系列
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 28, 2023
Implementation date
July 1, 2024
Scope
GB/T 31548-2023 is the English-translated version of 电动自行车轮胎系列.
GB/T 31548-2023 is the Chinese national standard covering series of electric bicycle tyres. Issued on 28 December 2023, it has been in force since 1 July 2024, replacing GB/T 31548-2015.
Document preview — GB/T 31548-2023
National Standard of the People's Republic of China
- ICS
- 83.160.10
- Classification
- G 41
- Replacing
- GB/T 31548-2015
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope5
- 2 Normative references5
- 3 Terms and definitions5
- 4 Classification5
- 5 Specification marking, basic parameters and main dimensions7
- 6 Measurement methods for tyre size12
- Annex A (normative) Calculation of main tyre dimensions14
- Annex B (informative) Tyres with new tyre section width (S) exceeding 54 mm -- Basic parameters and main dimensions17
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".
This document replaces GB/T 31548-2015 "Series of electric bicycle tyres". Compared with GB/T 31548-2015, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Change the classification of tyres (see Chapter 4 of this Edition; Chapter 4 of Edition 2015);
b) Change the requirements and examples of the old markings for hook straight edge and straight edge tyre specifications (see 5.2.1 of this Edition; 5.2.1 of Edition
2015);
c) Add tubeless tyre specification identification, basic parameters, main dimensions and related content (see 5.1, 5.4, Table 3 of this Edition);
d) Add footnote "c" for the main dimensions of new tyres in the tyre parameter table (see Table 1 and Table 2 of this Edition);
e) Add specific measurement tools, measurement conditions and measurement steps (see Chapter 6 of this Edition; Chapter 6 of Edition 2015);
f) Add the normative reference document GB/T 31546 (see 6.2.1 of this Edition).
Delete the original normative reference document HG/T 2906 (see Chapter 6 of Edition 2015);
g) Change and refine the value requirements of K (see A.1.1.2 of this Edition; A.1.1.2 of Edition 2015).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of National Technical Committee on Tyres and Rims of Standardization Administration of China (SAC/TC 19).
The drafting organizations of this document. Jiangsu General Technology Co., Ltd., New Dongyue Group Co., Ltd., Xiamen Chengshin Rubber Industry Co., Ltd., Bengbu Innova Tyre Co., Ltd., Tengzhou Saiyang Rubber Industry Co., Ltd., Guangzhou Feixuan Rubber Co., Ltd., Hebei Xiemei Rubber Products Co., Ltd., Sichuan Yuanxing Series of electric bicycle tyres
1 Scope
This document specifies the classification, specification marking, basic parameters, main dimensions and measurement methods of electric bicycle tyres.
This document applies to pneumatic tyres for electric bicycles.
This document does not apply to non-pneumatic tyres.
2 Normative references
GB/T 6326
GB/T 8170
GB/T 31546
GB/T 31580
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 tyre
A tyre whose bead core is made of steel wire or other high-strength material and whose bead profile is shaped to match the hook-and-straight-edge (CT) rim.
4 Classification
4.1 Bead structure
Electric bicycle tyres are divided into four categories according to the structural form of the tyre bead and rim. croctchet type (CT) tyre, see Figure 1a); straight-side (SS) 5.5.2 The maximum outer diameter (Dmax) and minimum outer diameter (Dmin) of a new tyre are calculated according to formula (3) and formula (4). Where, Dmax - the maximum outer diameter of a new tyre, in millimeters (mm);
H - the section height of a new tyre, in millimeters (mm);
b - the section height tolerance coefficient, which is 0.05;
DN - the nominal rim diameter, in millimeters (mm);
Dmin - the minimum outer diameter of a new tyre, in millimeters (mm).
The calculation results shall be integer values according to GB/T 8170.
5.6 Correction value for section width of new tyre installed on permitted rim
The correction value for the section width of a new tyre installed on an allowable rim is 0.4 times the difference between the nominal inner width of the measured rim and the allowable rim.
6 Measurement methods for tyre size
6.1 Measuring tools
6.1.1 Air pressure gauge. accuracy is ±5 kPa.
6.1.2 Flat steel tape measure. accuracy is ±1 mm.
6.1.3 Vernier caliper. accuracy is ±0.02 mm.
6.2 Measurement conditions
6.2.1 The appearance quality of the test tyres shall comply with the requirements of GB/T 31546.
6.2.2 Install the test tyre on the measuring rim specified in GB/T 31580.Inflate it to the inflation pressure specified in the standard.
6.2.3 Place the test tyre and rim assembly at a laboratory temperature of 25°C ± 10°C for at least 3 h. Annex A (normative) Calculation of main tyre dimensions A.1 Size calculation of croctchet type tyres, straight-side tyres and tubeless tyres A.1.1 Size calculation of new croctchet type tyres, straight-side tyres and tubeless tyres A.1.1.1 The section width (S) of a new tyre is calculated according to formula (A.1). Where, S - New tyre section width, in millimeters (mm);
SN - Tyre nominal section width, in millimeters (mm).
A.1.1.2 The section height (H) of a new tyre shall be calculated according to formula (A.2). Where, H - New tyre section height, in millimeters (mm);
K - Increased height, ranging from 2 mm to 3.5 mm (when S <=44, K =2; when 44< S <=54, K =2.5; when S >54, K =3.5).
A.1.1.3 The outer diameter of a new tyre (D0) is calculated according to formula (A.3). Where, D0 - New tyre outer diameter, in millimeters (mm);
Dr - Nominal rim diameter, in millimeters (mm).
A.1.2 Maximum use size calculation of croctchet type tyres, straight-side tyres and ......
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Editions of GB/T 31548
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 31548-2023 | Series of electric bicycle tyres | current edition | Current |
| GB/T 31548-2015 | Series of electric bicycle tyres | previous edition | Obsolete |
This page sells the current edition, GB/T 31548-2023. Earlier editions are listed for reference only.
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Related Standards
GB/T 31546-2015 — Electric bicycle tyres
GB/T 31580-2015 — Series of electric bicycle rims
GB/T 8170-2008 — Rules of rounding off for numerical values & expression and judgement of limiting values
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