Division 4 TESTING METHODS FOR MEASURING WET GRIPF1

For the calculation of the wet grip index (G) of a candidate tyre, the wet grip braking performance of the candidate tyre is compared to the wet grip braking performance of the reference tyre on a vehicle travelling straight ahead on a wet, paved surface. It is measured with one of the following methods:

• vehicle method consisting of testing a set of tyres mounted on an instrumented passenger car,

• testing method using a trailer towed by a vehicle or a tyre test vehicle, equipped with the test tyre(s).