Nokian Hakkapeliitta R3 SUV 315/40 R21

Nokian Hakkapeliitta R3 SUV is a winter tyre made in total of 81 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 100mm wider than the narrowest dimension (215) and -30mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height.