Michelin Pilot Sport S 5 315/35 R21

Michelin Pilot Sport S 5 is a summer tyre made in total of 39 sizes, ranging from R19 to R19 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/35 R21 is 90mm wider than the narrowest dimension (225) and -40mm narrower than the widest one (275). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (315mm), which results in 110.25mm sidewall height.