Michelin CrossClimate+ is a allround tyre made in total of 81 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 40mm wider than the narrowest dimension (145) and 70mm narrower than the widest one (255). 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 Michelin CrossClimate+ - "H", which is good for speeds up to 210 km/h. In 185/55 R15, CrossClimate+ usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 71%, compared to 75% of the Michelin in question.