Powertrac Snowstar 275/40 R20

Powertrac Snowstar is a winter tyre made in total of 10 sizes, ranging from R15 to R15 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/40 R20 is 80mm wider than the narrowest dimension (195) and 0mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height.