To the untrained eye, the side wall of a tyre can look like a meaningless set of numbers, letters and symbols.

Why is it that in some countries it’s either compulsory or recommended to swap your tyres twice a year? Why can’t you keep using your summer tyres in winter? And, likewise, why can’t you use your winter tyres in summer?

Tyre speed ratings tell you the maximum speed that particular tyre is legally approved for. This measurement ensures that the tyre you buy is appropriate – and safe – for the speed of the car it’s fitted on.