Michelin Primacy 4 275/70 R18

Michelin Primacy 4 is a summer tyre made in total of 384 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 275/70 R18 is 120mm wider than the narrowest dimension (155) and 30mm narrower than the widest one (305). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (275mm), which results in 192.5mm sidewall height.