Michelin Primacy 4 320/65 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. 320/65 R18 is 165mm wider than the narrowest dimension (155) and -15mm narrower than the widest one (305). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (320mm), which results in 208mm sidewall height.