Nokian Rotiiva AT 275/55 R20

Nokian Rotiiva AT is a winter tyre made in total of 33 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/55 R20 is 40mm wider than the narrowest dimension (235) and 10mm narrower than the widest one (285). 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.