Michelin Primacy HP 275/45 R18

Michelin Primacy HP is a summer tyre made in total of 38 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 275/45 R18 is 70mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height.