ISO 15222:2021
Truck and bus tyres — Method for measuring relative wet grip performance — Loaded new tyres
This document specifies the method for measuring relative wet grip braking performance index to a reference under loaded conditions for new tyres for use on commercial vehicles on a wet-paved surface.
The methods developed in this document are meant to reduce the variability. The use of a reference tyre is necessary to limit the variability of the testing method procedures.
This document applies to all commercial vehicle, truck and bus tyres.
This document does not apply to:
— tyres fitted with additional devices to improve traction properties (e.g. studded tyres);
— professional off-road tyres.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Methods for measuring wet grip
5 General test conditions
5.1 Track characteristics
5.1.1 General
5.1.2 Standard reference test tyre method
5.2 Wetting conditions
5.3 Atmospheric conditions
5.4 Reference tyre
6 Measurement of tyre wet grip on a standard vehicle
6.1 Principles
6.2 Equipment
6.2.1 Vehicle
6.2.2 Measuring equipment
6.3 Conditioning of the test track
6.4 Measurement requirements for test speed
6.5 Tyres and rims
6.5.1 Vehicle equipment
6.5.2 Tyre preparation and break-in
6.5.3 Tyre load
6.5.4 Tyre inflation pressure
6.6 Procedures
6.7 Processing of measurement results
6.7.1 Calculation of the braking force coefficient
6.7.2 Validation of results
6.7.3 Calculation of the adjusted braking force coefficients of the reference tyre
6.7.4 Calculation of the relative wet grip index of the tyre
6.8 Wet grip performance comparison between a candidate tyre and a reference tyre using a control tyre
6.8.1 General
6.8.2 Principle of the approach
6.8.3 Selection of a set of tyres as a control tyre set
6.8.4 Storage and preservation of control tyres
6.8.5 Replacement of control tyres
7 Test method using a trailer or a tyre test vehicle
7.1 Principle
7.2 Apparatus
7.3 Instrumentation
7.3.1 General
7.3.2 General requirements for measurement system
7.4 Selection and preparation of test tyres
7.5 Preparation of the apparatus and the test track
7.5.1 Towed trailer
7.5.2 Tyre test vehicle
7.5.3 Instrumentation and equipment
7.5.4 Conditioning of the track
7.6 General test conditions
7.7 Procedure
7.8 Processing of measurement results
7.8.1 General
7.8.2 Validation of results
7.8.3 Calculation of the relative wet grip index of the tyre
Annex A (informative) Example test reports of wet grip index
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Methods for measuring wet grip
5 General test conditions
5.1 Track characteristics
5.1.1 General
5.1.2 Standard reference test tyre method
5.2 Wetting conditions
5.3 Atmospheric conditions
5.4 Reference tyre
6 Measurement of tyre wet grip on a standard vehicle
6.1 Principles
6.2 Equipment
6.2.1 Vehicle
6.2.2 Measuring equipment
6.3 Conditioning of the test track
6.4 Measurement requirements for test speed
6.5 Tyres and rims
6.5.1 Vehicle equipment
6.5.2 Tyre preparation and break-in
6.5.3 Tyre load
6.5.4 Tyre inflation pressure
6.6 Procedures
6.7 Processing of measurement results
6.7.1 Calculation of the braking force coefficient
6.7.2 Validation of results
6.7.3 Calculation of the adjusted braking force coefficients of the reference tyre
6.7.4 Calculation of the relative wet grip index of the tyre
6.8 Wet grip performance comparison between a candidate tyre and a reference tyre using a control tyre
6.8.1 General
6.8.2 Principle of the approach
6.8.3 Selection of a set of tyres as a control tyre set
6.8.4 Storage and preservation of control tyres
6.8.5 Replacement of control tyres
7 Test method using a trailer or a tyre test vehicle
7.1 Principle
7.2 Apparatus
7.3 Instrumentation
7.3.1 General
7.3.2 General requirements for measurement system
7.4 Selection and preparation of test tyres
7.5 Preparation of the apparatus and the test track
7.5.1 Towed trailer
7.5.2 Tyre test vehicle
7.5.3 Instrumentation and equipment
7.5.4 Conditioning of the track
7.6 General test conditions
7.7 Procedure
7.8 Processing of measurement results
7.8.1 General
7.8.2 Validation of results
7.8.3 Calculation of the relative wet grip index of the tyre
Annex A (informative) Example test reports of wet grip index
Bibliography