Michelin Pilot Sport EV is a summer tyre made in total of 89 sizes, ranging from R19 to R19 - this particular dimension is R22, which means it fits to a 22 inch/558.8mm diameter wheel. 285/40 R22 is 60mm wider than the narrowest dimension (225) and 30mm narrower than the widest one (315). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (285mm), which results in 114mm sidewall height. In 285/40 R22, there is only one possible speed index for Michelin Pilot Sport EV - "V", which is good for speeds up to 240 km/h.