Michelin Primacy 4 305/35 R21

Michelin Primacy 4 is a summer tyre made in total of 384 sizes, ranging from R14 to R14 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 305/35 R21 is 150mm wider than the narrowest dimension (155) and 0mm narrower than the widest one (305). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (305mm), which results in 106.75mm sidewall height.