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GB/T 39971-2021: Thresholds and grading of relative wet grip index for motor vehicle tyres Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/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/GBT39971-2021GB 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 ContentsForeword ... 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 tyre1 ScopeThis 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 referencesThe 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 tyres3 Terms and definitionsFor 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 wetgrip 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. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 39971-2021 be delivered?Answer: The full copy PDF of English version of GB/T 39971-2021 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 39971-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 39971-2021_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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