Royal Black Royal Eco 215/55 R18

Royal Black Royal Eco is a tyre made in total of 8 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 215/55 R18 is 40mm wider than the narrowest dimension (175) and 10mm narrower than the widest one (225). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (215mm), which results in 118.25mm sidewall height.