Powered by Google www.ChineseStandard.net Database: 189759 (16 Jun 2024)

GB 518-2020 PDF in English


GB 518-2020 (GB518-2020) PDF English
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB 518-2020English125 Add to Cart 0-9 seconds. Auto-delivery. Motorcycle tyres Valid

PDF Preview

Standards related to: GB 518-2020

GB 518-2020: PDF in English

GB 518-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
CCS G 41
Replacing GB 518-2007
Motorcycle tyres
ISSUED ON: DECEMBER 24, 2020
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Requirements ... 6 
5 Test methods ... 7 
6 Marking ... 8 
Appendix A (Normative) Requirements for peripheral dimensions of new tyres
... 10 
Appendix B (Normative) Correspondence between tyre speed symbol and
maximum driving speed ... 12 
Appendix C (Normative) Correspondence between load index and tyre load
capacity ... 13 
Motorcycle tyres
1 Scope
This document specifies the requirements, test methods and marking for
motorcycle tyres.
This document applies to new pneumatic motorcycle tyres.
2 Normative references
The contents of the following documents, through normative references in this
text, constitute indispensable provisions of this document. Among them, for
dated references, only the edition corresponding to that date applies to this
document. For undated references, the latest edition (including all amendments)
applies to this document.
GB/T 521 Test method of measuring peripheral dimensions for tyres
GB/T 2983 Series of motorcycle tyres
GB/T 6326 Tyre terms and definitions
GB/T 7036.2 Inner tube of pneumatic tyres - Part 2: Inner tube of motorcycle
tyres
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 13203 Test methods for verifying capabilities of motorcycle tyres
HG/T 2177 Appearance quality of tyres
3 Terms and definitions
The terms and definitions defined in GB/T 6326 and the following one apply to
this document.
3.1
Motorcycle radial tyre
The pneumatic motorcycle tyre in which the carcass ply cords are arranged at
Tyres shall be tested for durability. After the durability test, the tyre shall not
have defects such as delamination, chunking, crack, joint cracking, cord
splitting or breaking. The test tyre pressure shall not be lower than the initial
pressure.
4.5.3 High-speed performance
Tyres with speed symbol J and above shall be subjected to high-speed
performance test. After the high-speed performance test, the tyre shall not have
defects such as delamination, chunking, crack, joint cracking, cord splitting or
break. The test tyre pressure shall not be lower than the initial pressure.
4.6 Tread wear mark
4.6.1 Each tyre shall, at equal distances along the circumferential direction, be
provided with no less than 3 clearly-observable tread wear marks. And make
the tread wear marks fall in the groove that is not more than 1/2 the tread width
by the center of the tyre crown. The height of the tread wear mark shall not be
less than 0.8 mm.
4.6.2 The shoulders on both sides of the tyre shall be moulded with marks
indicating the position of the tread wear mark.
4.7 Appearance quality
4.7.1 The tyre shall not have appearance defects that seriously affect the
service life; such as delamination between components, spongy, drawing-up
and breaking of the traveler, multiple cord breaks, folds of the cord in the tyre,
and rubber edge cords on the tyre crown, etc. The shape of the cushion belt
shall not be broken; or the belt body shall be cracked.
4.7.2 Other appearance quality of tyres and cushion belts shall comply with the
regulations of HG/T 2177.
4.8 Inner tube
If an inner tube is used, the inner tube shall meet the requirements of GB/T
7036.2.
5 Test methods
5.1 Refer to GB/T 2983 or relevant industry technical documents for test
parameters such as tyre size, load index, load capacity, measuring rim,
allowable rim and inflation pressure involved in the test methods. See Appendix
B for the correspondence between tyre speed symbol and maximum driving
speed. See Appendix C for the correspondence between tyre load index and
Appendix A
(Normative)
Requirements for peripheral dimensions of new tyres
A.1 Requirements for section width dimensions of new tyres
A.1.1 For tyres whose design section width is less than 100 mm, the new tyre's
section width tolerance is ±4 mm.
A.1.2 For tyres whose design section width is 100 mm and above, the new
tyre's section width tolerance is ±4%.
A.1.3 For tyres with a tread wider than their section width, the total width of the
tread is designated as the section width; shall not be less than the minimum
section width value of the new tyre.
A.2 Requirements for outer diameter dimensions of new tyres
A.2.1 The outer diameter dimensions of the new tyre shall not exceed the
values of Dmin and Dmax obtained from formulas (A.1) and (A.2):
Where:
Dmin - The minimum outer diameter of a new tyre, in millimeters (mm);
d - The nominal diameter of the rim, in millimeters (mm);
H - Design section height, in millimeters (mm);
Fhmin - Minimum tolerance factor.
Where:
Dmax - The maximum outer diameter of a new tyre, in millimeters (mm);
d - The nominal diameter of the rim, in millimeters (mm);
H - Design section height, in millimeters (mm);
Fhmax - Maximum tolerance factor.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.