Semperit Speed-Grip 3 225/40 R18

Semperit Speed-Grip 3 is a winter tyre made in total of 51 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 40mm wider than the narrowest dimension (185) and -30mm narrower than the widest one (195). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, Speed-Grip 3 usually competes against Speed-Grip 5, which is a tyre from Semperit with a rating of 80%, compared to 0% of the Semperit in question.