This standard specifies the method for measuring wet grip performance of tyres for use on passenger cars braking on a wet-paved surface, and it is used to assess the wet grip capability of tyres for use on passenger cars braking on a wet-paved surface.
The test method of comparison with standard reference test tyre is adopted in this standard.
This standard is applicable to new passenger car 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 6326-2014, ISO 4223-1:2002, NEQ)
GB 9743 Passenger car tyres
ASTM E303-93 (Reapproved 2013) Standard test method measuring surface frictional properties using the British pendulum tester
ASTM E965-96 (Reapproved 2006) Standard test method for measuring pavement macrotexture depth using a volumetric technique
3 Terms and definitions
For the purpose of this standard, the terms and definitions established in GB/T 6326 as well as the following ones apply.
3.1
candidate tyre
tyre that is evaluated by testing
3.2
standard reference test tyre; SRTT; reference tyre
special test tyre (set) that is used as a benchmark in an evaluation programme. These tyres usually have carefully controlled design features to minimize variation. They are produced, controlled and stored according to relevant
3.3
control tyre
tyre (set) that is used to indirectly work out the comparison result between SRTT amd candidate tyre by comparing it with candidate tyre and then with SRTT when the candidate tyre and the reference tyre cannot be directly compared on the same vehicle
GB/T 21910-2017 The following standards are cited：
