Semperit Speed-Grip 5 245/40 R18

Semperit Speed-Grip 5 is a winter tyre made in total of 130 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/40 R18 is 80mm wider than the narrowest dimension (165) and 40mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R18, Speed-Grip 5 usually competes against Polaris 6, which is a tyre from Barum with a rating of 83%, compared to 80% of the Semperit in question.