GB/T 39971-2021 PDF English
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| GB/T 39971-2021 | English | 85 |
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Thresholds and grading of relative wet grip index for motor vehicle tyres
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GB/T 39971-2021: Thresholds and grading of relative wet grip index for motor vehicle 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/GBT39971-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.160.10
G 41
Thresholds and grading of relative wet grip index for
motor vehicle tyre
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Thresholds and grading requirements for relative wet grip index ... 5
5 Test methods ... 7
Thresholds and grading of relative wet grip index for
motor vehicle tyre
1 Scope
This Standard specifies the thresholds and grading requirements and test
methods for relative wet grip index for motor vehicle tyre.
This Standard is applicable to new car radial tyres and new mini, light truck
radial tyres and new truck radial tyres, excluding tyres with nominal rim diameter
≤10 inches and nominal rim diameter ≥25 inches, T-type spare tyres for
temporary use only, special ST metric tyres for road trailers, high-passability
radial tyres for light trucks, truck tyres with a speed capability of 80km/h (not
included), racing tyres, studded tyres and professional off-road 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 6326, Tyre terms and definitions
GB/T 8170, Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 21910, Method for measuring relative wet grip performance of
passenger car tyres
GB/T 35163, Method for measuring relative wet grip performance of truck
and bus tyres
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
6326 as well as the followings apply.
3.1 traction tyre
Tyres that are mainly designed for driving wheels of vehicles. Compared with
ordinary tyres, this type of tyre has better gripping performance and can
transmit the power of the vehicle to the maximum extent. The tyre tread has at
least 2 circumferential strip patterns. Each pattern contains no less than 30
pattern blocks. These blocks are separated by grooves and small sipes that are
not less than half the depth of the main groove; or the depth of the tread
transverse groove is greater than half of the total thickness of the crown center.
3.2 professional off-road tyre
Tyres that are mainly designed for the use under harsh off-road conditions. For
passenger car tyres and mini-light truck tyres with a single tyre load index ≤ 121
and a speed class of N and above, the groove depth is not less than 11mm, the
pattern unsaturation is not less than 35%, and the speed grade is Q and below.
For mini, light truck tyres with single tyre load index ≤121 and speed class M
and below, or mini, light load tyres or truck tyres with single tire load index >121,
the groove depth is not less than 16mm, the unsaturation degree of the pattern
is not less than 35%, and the speed level is K and below.
3.3 special use tyre
Tyres that are mainly designed for the use under special conditions. Compared
with ordinary tyres, the block size of this type of tyres is larger, the spacing is
wider, and the groove depth is deeper. The tread pattern is a mixture of road
and off-road patterns, or off-road patterns. For passenger car tyres and mini-
light truck tyres with a single tyre load index ≤121 and a speed class of N and
above, the depth of the main groove is not less than 11mm, and the
unsaturation of the pattern is not less than 35%. For mini, light truck tyres with
single tyre load index ≤121 and speed class of M and below, or mini, light truck
tyres or truck tyres with single tyre load index >121, the depth of the main
groove is not less than 16mm, and the unsaturation of the pattern is not less
than 35%.
4 Thresholds and grading requirements for relative wet
grip index
4.1 Thresholds of relative wet grip index
4.1.1 The relative wet grip index for motor vehicle tyre shall not be less the
provisions in Table 1.
Table 1 -- Thresholds of relative wet grip index for motor vehicle tyre
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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