GB 518-2020 PDF English
US$125.00 · In stock · Download in 9 secondsGB 518-2020: Motorcycle tyres Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 518: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 518-2020 | English | 125 |
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Motorcycle tyres
| Valid |
| GB 518-2007 | English | 70 |
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Motorcycles tyres
| Obsolete |
| GB 518-1997 | English | 279 |
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Motorcycle tyres
| Obsolete |
| GB 518-1991 | English | 319 |
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Motorcycle tyres
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 518-2020
GB 518-2020: Motorcycle tyres---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB518-2020
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
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1.Rules for the structure and drafting of standardizing
documents".
This document replaces GB 518-2007 "Motorcycles tyres". Compared with GB
518-2007, the main technical changes are as follows.
- ADD the term and definition of motorcycle radial tyre (see Clause 3);
- ADD "load index (code indicates the corresponding level added to the series
or level description)" (see 4.1);
- In the strength performance requirements, modify "The minimum damage
energy of tyres shall not be lower than the requirements of Table 1" to "The
strength test damage energy of each test point shall not be lower than the
requirements of Table 1" (see 4.5.1; 4.2.1 of the 2007 edition);
- Modify the applicable maximum driving speed of the tyre that shall be
subjected to the high-speed performance test to the speed symbol J level
and above (see 4.5.3; 4.2.3 of the 2007 edition);
- ADD the requirement that the tread wear marks shall fall in the groove that
is not more than 1/2 the tread width by the center of the tyre crown (see
4.6.1);
- Modify the "place name" in marking to "place of origin" [see 6.1b); 6.1b) of
the 2007 edition];
- Modify the "level or load index" in marking to "load index (code indicates
the corresponding level added to the series or level description)" [see 6.1c);
6.1c) of the 2007 edition];
- Delete the marking requirement of "Metric series and code-designated
series tyres shall be marked with speed symbols" (see 6.2 of the 2007
edition); modify it to all motorcycle tyres shall be marked with speed
symbols [see 6.1d)];
- Modify the "framework material" in marking to "Name and number of layers
of the framework material for the crown and sidewall of radial tyres; name
of the framework material for bias tyres" [see 6.1e); 6.1d) of the 2007
edition];
- ADD the marking requirements for the position of the tread wear mark [see
6.1f)];
- ADD some characteristic distinguishing marks when the tread type is C-
type and D-type (see 6.7, 6.8 and 6.9);
- ADD the mark for moped tyres (see 6.10);
- ADD requirements for peripheral dimensions of new tyres (see Appendix A);
- ADD a table of correspondence between tyre speed symbol and maximum
driving speed (see Appendix B);
- ADD a table of correspondence between tyre load index and load capacity
(see Appendix C).
This document was proposed by and shall be under the jurisdiction of Ministry
of Industry and Information Technology of the PRC.
The previous releases of this document and the documents it replaces are as
follows.
- GB 518-1965, GB 518-1974, GB 518-1991, GB 518-1997, GB 518-2007.
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
an angle of 65°~90° with the center line of the tread and the carcass is tightened
with a belt.
4 Requirements
4.1 Tyre size, load index (code indicates the corresponding level added to
the series or level description), load capacity, measuring rim, allowable
rim and inflation pressure
It shall comply with GB/T 2983 or relevant industry technical documents.
4.2 Peripheral dimensions of new tyres
It shall comply with the provisions of Appendix A.
4.3 Correspondence between tyre speed symbol and maximum driving speed
It shall comply with the provisions of Appendix B.
4.4 Correspondence between tyre load index and load capacity
It shall comply with the provisions of Appendix C.
4.5 Safety performance
4.5.1 Strength performance
Tyres shall be tested for strength performance. The strength test damage
energy of each test point shall not be lower than the requirements of Table 1.
4.5.2 Durability
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.
4.7 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.
5.2 The outer diameter, section width, and tread wear mark height of a new tyre
after inflation are measured in accordance with GB/T 521.
5.3 The strength performance, durability and high-speed performance of tyres
are tested in accordance with GB/T 13203.
5.4 The appearance quality of tyres shall be inspected according to HG/T 2177.
5.5 When necessary, the inner tube can be inspected according to GB/T 7036.2.
6 Marking
6.1 Each tyre shall have the following marks.
a) Size;
b) Trademark;
c) Name of manufacturer or place of origin;
d) Load index (code indicates the corresponding level added to the series or
level description), load capacity, and inflation pressure;
e) Speed symbol;
f) Name and number of layers of the framework material for the crown and
sidewall of radial tyres; name of the framework material for bias tyres;
g) Marking of the position of tread wear mark (such as "△" and/or "T.W.I");
h) Production number;
i) Check mark.
6.2 Metric series tyres with nominal rim diameter code 13 and above shall be
marked with "M/C".
6.3 Radial tyres shall be marked "RADIAL" or "radial".
6.4 Tubeless tyres shall be marked "TUBELESS" or "tubeless".
6.7 Tyres with C-type treads suitable for road and off-road driving shall be
marked with "DP" or "dual purpose".
6.8 Special-purpose tyres with D-type treads, which are allowed to drive on
roads, shall be marked with "MST".
6.10 Moped tyres shall be marked "MOPED".
6.11 The markings specified in 6.2~6.10 shall be permanent markings on the
sidewall.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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