Royal Black Royal Sport 255/50 R20

Royal Black Royal Sport is a tyre made in total of 30 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/50 R20 is 40mm wider than the narrowest dimension (215) and 30mm narrower than the widest one (285). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (255mm), which results in 127.5mm sidewall height.