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GB/T 23657-2018 English PDF (GBT23657-2018)

GB/T 23657-2018 English PDF (GBT23657-2018)

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GB/T 23657-2018: Series of cycle rims

This Standard specifies the dimensions and tolerances of various types of cycle rim contours, and gives the rim contour curve and its main dimensions of the matching part between the tyre and the rim. This Standard applies to the rims of various series of cycle tyres included in GB/T 7377.
GB/T 23657-2018
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.160.10
G 41
Replacing GB/T 23657-2009
Series of cycle rims
(ISO 5775-2:2015, Bicycle tyres and rims - Part 2: Rims, MOD)
ISSUED ON: DECEMBER 28, 2018
IMPLEMENTED ON: NOVEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Symbols ... 6
5 Classification and designation ... 7
6 Straight side rims (SS type) ... 7
7 Hooked bead type rims (HB type) ... 11
8 Crotchet type rims (CT type) ... 12
9 Beaded edge rims (BE type) ... 14
10 Rim valve hole and rim tape ... 16
Appendix A (Informative) Structural changes between this Standard and ISO 5775- 2:2015 ... 17
Appendix B (Informative) Technical differences between this Standard and ISO 5775- 2:2015 and their reasons ... 18
Appendix C (Informative) Methods for measuring and gauging bicycle rim dimensions ... 20
Series of cycle rims
1 Scope
This Standard specifies the dimensions and tolerances of various types of cycle rim contours, and gives the rim contour curve and its main dimensions of the matching part between the tyre and the rim.
This Standard applies to the rims of various series of cycle tyres included in GB/T 7377. 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 2933, Wheels and rims for pneumatic tyres - Vocabulary, designation and marking (GB/T 2933-2009, ISO 3911:2004, IDT)
GB/T 6326, Tyre terms and definitions (GB/T 6326-2014, ISO 4223-1:2002, NEQ) GB/T 7377, Series of cycle tyres (GB/T 7377-2017, ISO 5775-1:2014, MOD) 3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 2933 and GB/T 6326 apply.
4 Symbols
The following symbols apply to this document.
A Rim width
D Specified rim diameter
D1 Measured rim diameter
D2 External diameter
Dm Measuring mandrel diameter
G Flange height
H, H1 Well depth (unobstructed minimum depth above rim base with rim tape fitted to permit tyre fitment)
L Theoretical tape length
L1 Well width (well width above rim tape)
P Bead seat width
R1, R2 Flange radius
R4 Well top radius
R7 Well side radius
W Measuring tape width
5 Classification and designation
Designation classified by the rim type and its structure are as follows: -- Straight side rims (referred to as SS type);
-- Hooked bead type rims (referred to as HB type);
-- Crotchet type rims (referred to as CT type);
-- Beaded edge rims (referred to as BE type).
Implement the scope of application, figures and requirements for main dimensions of the above four types of rims in accordance with the provisions of Chapters 6 ~ 9. See Chapter 10 for the requirements for main dimensions of the rim valve hole. Refer to Appendix C for the inspection method of rims.
6 Straight side rims (SS type)
6.1 SS type rims are to be used only with non-foldable rigid bead straight-side tyres. The measuring rim width and the allowable rim width shall comply with the provisions of GB/T 7377.
6.2 The SS type rim contour curve is shown in Figure 1, and the dimensions and tolerances are given in Table 1 and Table 2.

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