Imperial F110 275/40 R20

Imperial F110 is a summer tyre made in total of 12 sizes, ranging from R20 to R20 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/40 R20 is 10mm wider than the narrowest dimension (265) and 30mm narrower than the widest one (305). 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.