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. 295/40 R21 is 80mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (295mm), which results in 118mm sidewall height. In 295/40 R21, there is only one possible speed index for Nokian Hakkapeliitta R3 SUV - "T", which is good for speeds up to 190 km/h.