Bridgestone Potenza RE050 265/40 R18

Bridgestone Potenza RE050 is a summer tyre made in total of 13 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 265/40 R18 is 50mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (265mm), which results in 106mm sidewall height.