Royal Black Royal Winter 275/40 R20

Royal Black Royal Winter is a tyre made in total of 43 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/40 R20 is 110mm wider than the narrowest dimension (165) and -10mm narrower than the widest one (265). 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.