GB/T 1702-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1702-2017 | English | 145 |
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Cycle tyres
| Valid |
| GB/T 1702-2008 | English | 519 |
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Cycle tyres
| Obsolete |
| GB/T 1702-1997 | English | 399 |
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Cycle tyres
| Obsolete |
| GB/T 1702-1992 | English | RFQ |
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Tyres for cycles
| Obsolete |
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GB/T 1702-2017: Cycle 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/GBT1702-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
G 41
Replacing GB/T 1702-2008
Cycle tyres
Issued on. JULY 12, 2017
Implemented on. JUNE 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Illustration of types... 6
5 Requirements... 7
6 Test methods... 9
7 Marking, packaging, transport and storage... 13
8 Others... 13
Appendix A (Normative) Appearance quality requirements... 14
Appendix B (Normative) Fracturing evaluation method... 16
Appendix C (Normative) Transport and storage... 17
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 1702-2008 “Cycle tires”. As compared with GB/T
1702-2008, the main technical changes are as follows.
- MODIFY the various types of illustrations for a more complete cross-
sectional view of the tire components (SEE Clause 4; Clause 4 of the 2008
version);
- MODIFY the item 3 in “Table 1 Tire performance”, changing “non-black tire
sidewall resistance to ozone aging” into “sidewall rubber resistance to
ozone aging”; MODIFY this performance index “Within fracturing C-2 as
specified in Appendix D” into “the fracturing degree does not exceed the C-
2 as specified in Appendix D” (SEE 5.3; clause 5.3 of 2008 version);
- MODIFY the item 5 in “Table 1 Tire performance”, changing the “tension
strength of bead ring / KN” into “tensile strength of bead ring / KN”, and
changing the “straight edge, hooked edge and hooked straight edge tire” in
this performance indicator column into “the tire using steel wire or fiber
material as the bead ring” (SEE 5.3; clause 5.3 of 2008 version);
- MODIFY the item 6 and item 7 in the “Table 1 Tire performance”, CHANGE
the test result unit of the cord fabric tensile strength and adhesive strength
from kN/m into N/mm (SEE 5.3; clause 5.3 of 2008 version);
- MODIFY the footnote “a” of Table 1, changing the tread wear test stroke
from 1.6 km to 1.61 km (SEE 5.3; clause 5.3 of the 2008 version);
- In the preparation of tread wear test specimens, MODIFY the “the cut
specimen is ground on a grinding wheel to a thickness of 2.0 mm ± 0.2 mm”
into “the thickness of the cut specimen is 2.0 mm ± 0.2 mm” [see b) of 6.3.2;
clause6.3.2.2 of 2008 version];
- In the cord tensile strength test, MODIFY the “use of cord tension tester,
canvas tension tester or rubber tension tester” into the “use of tension tester”
(SEE 6.7; clause 6.7 of 2008 version);
- In the adhesion strength test between tread rubber and fabric layer,
MODIFY the “use rubber tension tester’s fixture to clamp the specimen” into
the “use the tension tester’s fixture to clamp the specimen” (SEE 6.8.1;
clause 6.8.1 of 2008 version);
- ADD the tubeless tire markings and tire direction markings (SEE 7.1; clause
7.1 of 2008 version);
- ADD the appearance defects of non-clear inner tube marking and the
allowable range of various defects in “Table A.1 Tire appearance quality”,
and the footnote “b” to the “non-conformity classification” (SEE Appendix A;
Appendix C of 2008 version);
- DELETE the provisions that “in the storage conditions, the storage period
from the date of exit-factory does not exceed 1 year” (SEE E.2.5 of 2008
version).
This standard was proposed by the China Petrochemical and Chemical Industry
Federation.
This standard shall be under the jurisdiction of the National Tire Rim
Standardization Technical Committee (SAC/TC 19).
Drafting organizations of this standard. Zhongce Rubber Group Co., Ltd.,
Xiamen Zhengxin Rubber Industry Co., Ltd., Jiantai Rubber (Shenzhen) Co.,
Ltd., Jiangsu Feichi Co., Ltd., Sichuan Yuanxing Rubber Co., Ltd., Xindongyue
Group Co., Ltd., Tianjin Wanda Tire Group Co., Ltd., Guangzhou Feixuan
Rubber Co., Ltd., Bengbu INNOVA Tire Co., Ltd., Hebei Xiemei Rubber
Products Co., Ltd.
The main drafters of this standard. Wang Jirong, Luo Nailiang, Xu Min, Cai
Yingyu, Yan Yongzhi, Yang Xueyun, Chen Qingsong, Ding Xinghai, Zhang
Guangfu, Xuan Zhaomin, Yu Zhenjiang, Huang Yaopeng, Ni Qianxiang, Gao
Xi’en.
This Standard replaces the standard previously issued as follows.
- GB 1702-1979, GB 1702-1986, GB/T 1702-1992, GB/T 1702-1997, GB/T
1702-2008.
Cycle tyres
1 Scope
This standard specifies the terms and definitions, types, requirements, test
methods, markings, packaging, transportation, and storage of the cycle tires
This standard applies to pneumatic tires specified in GB/T 7377.
This standard does not apply to tubular racing tires and non-pneumatic tires.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile
stress-strain properties
GB/T 1689 Rubber vulcanized - Determination of abrasion resistance (Akron
machine)
GB/T 2941 Rubber - General procedures for preparing and conditioning test
pieces for physical test methods
GB/T 6326 Tyre - Terms and definitions
3 Terms and definitions
The terms and definitions defined in GB/T 6326 and the following apply to this
document.
3.1
Non-weighted type
The tire which has a tire load less than 120 kg is non-weighted tire.
4 Illustration of types
4.1 The straight-side (SS) tire is shown in Figure 1a).
4.2 The hooked-side (HB) tire is shown in Figure 1b).
4.3 The soft-side (BE) tire is shown in Figure 1c).
5 Requirements
5.1 Tire specifications, basic parameters and major dimensions
The specifications, basic parameters, and major dimensions of the tire shall
meet the requirements of GB/T 7377.
5.2 Appearance
Tires are installed on rims that meet the requirements of GB/T 7377 or agreed
between the supplier and the purchaser. There must be no visible oscillation
during visual inspection.
5.3 Performance
Tire performance shall meet the requirements of Table 1.
6 Test methods
6.1 Determination of basic parameters and major dimensions of tire
Tests for the basic parameters and major dimensions of the tires are carried out
in accordance with the provisions of HG/T 2906.
6.2 Tread rubber tensile test
6.2.1 Test is performed in accordance with the provisions of GB/T 528, and the
type 2 cutter is used.
6.3 Tread rubber wear test
6.3.1 Determination of cycle tire tread rubber wear is performed in accordance
with the provisions of GB/T 1689.
6.3.2 The sample preparation is as follows.
6.3.3 The tread rubber specimen crown rubber is ground surface.
6.3.4 If it is difficult to take sample, it can be tested by preparing the tread rubber
into standard specimen in accordance with GB/T 2941.
6.4 Sidewall ozone aging resistance test
6.5 Tire lug bending test
From the tested tire, CUT a 100 mm long tire lug rubber as the specimen, STRIP
off the adhesive tape from the tire lug rubber, LET the middle part of the bottom
of the specimen be in perpendicular contact with a round rod which has a
diameter of 10 mm, BEND it around the rod slowly to make it into a straight
angle, LET it be standing for 1 min, CHECK whether there is fracturing. The test
is performed at laboratory conditions.
6.6 Tire bead tensile strength test
CUT a tire bead with a length of approximately 200 mm at the tire bead area,
USE a tensile tester with an accuracy of ± 2% to perform test at room
temperature, the decreasing speed of the tensile tester is 25 mm/min.
6.7 Cord fabric tensile strength test
From the corresponding part of the tire crown, along the longitudinal direction
of first layer of the cord fabric, MAKE a test piece with a width of 10 mm, USE
the tensile tester to perform test. The test shall be carried out under laboratory
conditions. The tensile speed shall be 200 mm/min ~ 300 mm/min.
6.8 Adhesion strength test
6.9 Strength test
The tube strength test of the tire is carried out in accordance with the provisions
of GB/T 9749.
6.10 Detachment hydraulic test
The detachment hydraulic pressure of tire is tested in accordance with the
provisions of GB/T 9749.
6.11 Durability test
The durability test of the tire is carried out in accordance with the provisions of
GB/T 9749.
6.12 Static load test
The static load test of the tire is carried out in accordance with the provisions of
HG/T 2906.
7 Marking, packaging, transport and storage
7.1 Marking
Tires shall have the following markings, where a) ~ d) are permanent markings,
and e) and f) are markings that cannot be washed off. The marking is as follows.
7.2 Packaging
Packaging shall meet the requirements of commodity packaging and be
conducive to transportation and storage.
8 Others
If there are special requirements, they can be resolved through consultation
between the supplier and the purchaser in accordance with the main principles
of this standard.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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