Nokian Rotiiva AT Plus 275/55 R20

Nokian Rotiiva AT Plus is a summer tyre made in total of 14 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/55 R20 is 50mm wider than the narrowest dimension (225) and 30mm narrower than the widest one (305). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (275mm), which results in 151.25mm sidewall height.