Semperit AllSeason-Grip is a allround tyre made in total of 43 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 30mm wider than the narrowest dimension (155) and 40mm narrower than the widest one (225). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (185mm), which results in 101.75mm sidewall height. In 185/55 R15, there is only one possible speed index for Semperit AllSeason-Grip - "H", which is good for speeds up to 210 km/h. In 185/55 R15, AllSeason-Grip usually competes against Multiseason 2, which is a tyre from Firestone with a rating of 60%, compared to 34% of the Semperit in question.