Michelin Pilot Sport 4 255/35 R18

Michelin Pilot Sport 4 is a summer tyre made in total of 185 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/35 R18 is 50mm wider than the narrowest dimension (205) and 70mm narrower than the widest one (325). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (255mm), which results in 89.25mm sidewall height.