Royal Black Royal Winter 255/55 R18

Royal Black Royal Winter is a tyre made in total of 43 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/55 R18 is 90mm wider than the narrowest dimension (165) and 10mm narrower than the widest one (265). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (255mm), which results in 140.25mm sidewall height.