Michelin Primacy 4 285/30 R20

Michelin Primacy 4 is a summer tyre made in total of 386 sizes, ranging from R14 to R14 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/30 R20 is 130mm wider than the narrowest dimension (155) and 20mm narrower than the widest one (305). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (285mm), which results in 85.5mm sidewall height.