Michelin Primacy 4 255/50 R18

Michelin Primacy 4 is a summer tyre made in total of 367 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/50 R18 is 100mm wider than the narrowest dimension (155) and 50mm narrower than the widest one (305). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height.