Royal Black Royal Sport 285/50 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. 285/50 R20 is 70mm wider than the narrowest dimension (215) and 0mm narrower than the widest one (285). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (285mm), which results in 142.5mm sidewall height.