Nokian Rotiiva AT 255/70 R17

Nokian Rotiiva AT is a winter tyre made in total of 33 sizes, ranging from R13 to R13 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 255/70 R17 is 20mm wider than the narrowest dimension (235) and 30mm narrower than the widest one (285). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (255mm), which results in 178.5mm sidewall height.