Michelin Pilot Sport EV 255/50 R21

Michelin Pilot Sport EV is a summer tyre made in total of 91 sizes, ranging from R19 to R19 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 255/50 R21 is 30mm wider than the narrowest dimension (225) and 60mm narrower than the widest one (315). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height.