GB/T 521-2023 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 521-2023 | English | 125 |
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Test methods for measuring peripheral dimensions of tyres
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| GB/T 521-2012 | English | 70 |
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Test method of measuring peripheral dimensions for tyres
| Obsolete |
| GB/T 521-2003 | English | 239 |
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Test method of measuring peripheral dimensions for tyres
| Obsolete |
| GB/T 521-1993 | English | 199 |
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Test method of measuring peripheral dimensions for tyres
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GB/T 521-2023: Test methods for measuring peripheral dimensions of 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/GBT521-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.01
CCS G 41
Replacing GB/T 521-2012
Test methods for measuring peripheral dimensions of tyres
Issued on. MARCH 17, 2023
Implemented on. OCTOBER 01, 2023
Issued by. State Administration for Market Regulation;
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... 6
4 Measurement tools and their accuracy requirements... 6
5 Measurement conditions... 6
6 Measurement methods... 7
7 Data calculation and processing... 10
8 Test report... 11
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 521-2012 "Test method of measuring peripheral
dimensions for tyres". Compared with GB/T 521-2012, in addition to the structural
adjustments and editorial changes, the main technical changes in this document are as
follows.
- Add "Electric bicycle tyres and rickshaw tyres" in the scope of application (see
Chapter 1 of this Edition);
- Change the accuracy requirements for the tyre pressure gauge (see 4.1 of this
Edition; 4.1 of Edition 2012);
- Add "non-contact measuring instruments" and related requirements (see 4.7 of this
Edition);
- Add specific provisions on measuring inflation pressure (see Table 1 of this
Edition);
- Add measurement method for "overall tyre width" (see 6.2.1 of this Edition);
- Change the provisions on the number of measurement points for "section width,
groove depth, tread wear mark height" (see 6.2~6.4 of this Edition; 6.2~6.4 of
Edition 2012);
- Change the value of "π" from "3.14" to "3.1416" (see 7.1 of this Edition; 7.1 of
Edition 2012).
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. Triangle Tyre Co., Ltd., Shandong
Linglong Tyre Co., Ltd., Prinx Chengshan (Shandong) Tyre Co., Ltd., Sailun Group Co.,
Ltd., Zhongce Rubber Group Co., Ltd., Beijing Rubber Industry Research and Design
Institute Co., Ltd., Qingdao Sentury Tyre Co., Ltd., Sichuan Tyre & Rubber (Group)
Co., Ltd., Double Star Group Co., Ltd., Double Money Tyre Group Co., Ltd., Guizhou
Tyre Co., Ltd., Shandong Changfeng Tyre Co., Ltd., Xiamen Zhengxin Rubber Industry
Co., Ltd., Shandong Jinyu Tyre Co., Ltd., Shandong Xinghongyuan Tyre Co., Ltd.,
Anhui Jiatong Passenger Radial Tyre Co., Ltd., Wanli Tyre Co., Ltd., Fengshen Tyre
Co., Ltd., Jining Qilu Testing Technology Co., Ltd., Pirelli Tyre Co., Ltd., Hankook
Tyre Co., Ltd., Bridgestone (China) Investment Co., Ltd., Dalian Goodyear Tyre Co.,
Ltd., Michelin (China) Investment Co., Ltd., Continental Tyre (China) Co., Ltd.,
Sumitomo Rubber (China) Co., Ltd., SAIC-GM Wuling Motors Co., Ltd., Heilongjiang
Red River Valley Automobile Testing Co., Ltd., Jiaozuo Quality and Technology
Supervision, Inspection and Testing Center.
Main drafters of this document. Hou Jingbin, Chen Shaomei, Li Chongbing, Gao Ming,
Lu Jian, Wang Jigang, Zheng Rui, Li Miaomiao, Qin Jingbo, Tang Peng, Qu Binjian,
Dong Wenwu, Jiang Zhongkai, Pan Wen, Chen Jianming, Yang Wanlong, Zhu Zuoyong,
Chen Zhiyou, Mai Haiying, Li Chao, Gao Ming, Niu Fuxiang, Liu Qingjie, Zhu Cheng,
Yin Qingye, Zhou Ling, Ma Zhong, Zhang Bin, Qi Jiande, Zhao Xinhong, Wang Kexian,
Xu Lihong, Mou Shouyong, Li Shuhuan, Yang Zhong, Long Shengzhong.
This document was first issued in 1965.The first revision was in 1984.The second
revision was in 1993.The third revision was in 2003.The fourth revision was in 2012.
This is the fifth revision.
Test methods for measuring peripheral dimensions of tyres
1 Scope
This document describes the measurement methods for peripheral dimensions of
pneumatic tyres (cover tyre, inner tube and pad belt), including measurement tools and
their accuracy requirements, measurement conditions, measurement methods, data
calculation and processing, and test reports.
This document is applicable to passenger car tyres, truck tyres, agricultural tyres,
engineering machinery tyres, industrial vehicle pneumatic tyres, motorcycle tyres,
electric bicycle tyres and cycle tyres.
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 2977, Size designation, dimensions, inflation pressure and load capacity for
truck tyres
GB/T 2978, Size designation, dimensions, inflation pressure and load capacity for
passenger car tyres
GB/T 2979, Size designation, dimensions, inflation pressure and load capacity for
agricultural tyres
GB/T 2980, Size designation, dimensions, inflation pressure and load capacity for
earth-mover tyres
GB/T 2982, Designation, dimensions, inflation pressure and load capacity of
pneumatic tyres for industrial vehicles
GB/T 2983, Series of motorcycle tyres
GB/T 6326, Tyre terms and definitions
GB/T 7377, Series of cycle tyres
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 31548, Series of electric bicycle tyres
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 6326 apply.
4 Measurement tools and their accuracy requirements
4.1 Tyre pressure gauge.
4.2 Steel ruler and metal tape measure (without curvature). ±1 mm.
4.5 Thickness gauge. ±0.01 mm.
4.6 Calipers.
4.7 Non-contact measuring instruments (such as laser measuring instruments). ±0.02 mm.
5 Measurement conditions
5.1 After the tyre is vulcanized, it shall be parked at room temperature for at least 24 h.
Before inflating, it shall be parked at a temperature of 18℃ ~ 36℃ for at least 3 h. If
necessary, clean the measurement position on the tyre surface before measurement.
Trim vent beard and molding bead.
5.2 Tubeless tyres shall be mounted on rims for tubeless tyre measurements. Inflate
according to 5.3.In order to make the tyre bead and rim fit in place, the inflation
pressure can be increased appropriately under the premise of ensuring safety. After the
bead is on and in place, adjust to the specified air pressure.
5.3 Inflate the tyre to the inflation pressure specified in Table 1.
5.4 After the tyre is inflated to the specified inflation pressure, park it at a temperature
of 18°C~36°C for at least 24 h.
6 Measurement methods
6.1 Tyre outer circumference
Use a metal tape measure to wrap around the tyre along the centerline of the crown or
near the highest point of the centerline. Measure the outer circumference.
6.2 Overall tyre width and section width
6.2.1 Overall width
Select sidewall areas with logos, trim lines and chafing lines. Use vernier calipers or
calipers to measure the overall width of the tyre at least approximately a quarter of the
circumference of the tyre (see Figure 1).
6.2.2 Section width
Select sidewall areas without logos, trim lines and scuff lines. Use vernier calipers or
calipers to measure the section width of the tyre at least about four equal parts of the
tyre circumference.
6.3 Depth of tread grooves
When measuring with a tread depth gauge, tread wear marks or other character pattern
marks shall be avoided. The pattern depth gauge shall be kept perpendicular to the
bottom of the pattern groove (see Figure 2).
6.5 Pad belt thickness
Use a thickness gauge to measure the thickness of the middle part of the pad belt and
the place less than or equal to 1mm from the edge of the pad belt. The thickened part of
the valve hole shall be avoided. Measure 4 points on the four equal parts of the
circumference of the pad belt, respectively.
6.6 Flattened width of the pad belt
After flattening the inner tube contact surface of the pad belt outward, use a steel ruler
to measure its width. Measure about 4 points in quarters.
6.7 Outer circumference of inner tube
Let the inner tube stand for 2 h after exhausting the air. After placing it on a flat surface
and folding it into a semicircle, use a tape measure to measure its outer half
circumference. The resulting value is multiplied by 2, which shall be the outer
circumference of the inner tube.
6.8 Flat-folded section width of inner tube
Flatten the cross section with a steel ruler. Measure the width at four quarters along the
circumference of the inner tube.
7 Data calculation and processing
7.1 Outside diameter of tyre
The outer diameter of the tyre is calculated according to formula (1).
7.2 Overall tyre width, section width, tyre groove depth, pad belt thickness,
flattened width of pad belt
The overall width of the tyre is the maximum value of each measuring point. The
arithmetic mean value of each measurement point is taken as the width of the section
and the flattened width of the pad belt.
The arithmetic mean value of each measurement point is taken as the tyre groove depth
and pad belt thickness. The unit is millimeters. Round off to one decimal place
according to GB/T 8170.
7.3 Height of tread wear marks
The height of the tread wear mark is calculated according to formula (2).
7.4 Outer circumference length of inner tube and width of flat folded section
The measurement of the outer circumference of the inner tube is in millimeters. Round
off to an integer according to GB/T 8170.The arithmetic mean value of each
measurement point is taken as the width of the flat folded section, in millimeters. Round
off to an integer according to GB/T 8170.
8 Test report
The test report shall include the following.
a) Test tyre manufacturer name, trademark, specification, production number;
b) Tyre load index or load capacity or rating, measured air pressure;
c) Tyre outer circumference, outer diameter, overall width or section width;
d) Depth of tyre grooves, height of tread wear marks;
e) Thickness of pad belt, flattened width of pad belt;
f) Outer circumference of inner tube, flat folded section width;
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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