Michelin Pilot Sport 5 Energy 265/40 R21

Michelin Pilot Sport 5 Energy is a summer tyre made in total of 26 sizes, ranging from R18 to R18 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 265/40 R21 is 30mm wider than the narrowest dimension (235) and 50mm narrower than the widest one (315). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (265mm), which results in 106mm sidewall height.