Wet braking performance is critical to your road safety as it affects how quickly you will be able to stop in wet conditions.
Wet braking performance is also categorised in seven classes. An A-rated tyre provides the shortest braking distances on wet roads whereas a G-rated tyre will have the longest braking distance in the wet.
Driving on four A-rate tyres at 50mph can help you stop up to 18m* shorter, which is approximately 4 car lengths, than if you were driving on four G-rated tyres (Source: European Commission impact assessment SEC (2008) 2860). * When measured according to the test methods set out in Regulation EC 1222/2009