Michelin e.Primacy 235/45 R21

Michelin e.Primacy is a summer tyre made in total of 178 sizes, ranging from R15 to R15 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 235/45 R21 is 70mm wider than the narrowest dimension (165) and 40mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height.