Bridgestone Potenza RE050A 275/45 R18

Bridgestone Potenza RE050A is a summer tyre made in total of 109 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 275/45 R18 is 100mm wider than the narrowest dimension (175) and 30mm narrower than the widest one (305). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height.