The optimised tread pattern ensures better interlocking with the snow which automatically leads to shorter braking distances. Additionally the tread grooves and shoulder blocks enhance the compression of snow in the grooves. Therefore the grip increases and also the traction in the snow.
Through the wide grooves the water displacement is optimised, which ensures high aquaplaning safety. Additionally, the 3D sipes support each other lead to higher stability. As a result the braking distances are shortened on wet roads.
The new silica compound reduces energy loss and improves the rolling resistance.
Secure grip in wet conditions is crucial for safe driving. Performance is graded into classes, A to G (although D and G are not currently used). The stopping distance between a class A tire and a class F tire can be as much as 18 metres.
Reduced rolling resistance saves fuel and cuts CO2 emissions. Class A tires deliver the best fuel efficiency, with each subsequent class through to G increasing fuel consumption by between 0.42 and 0.56 mpg for a car which does 36 mpg.
This is the external noise made by the tire and is measured in decibels. The more filled bars shown on the label, the louder the tires.