Bridgestone Potenza Sport Evo 215/40 R18

Bridgestone Potenza Sport Evo is a summer tyre made in total of 105 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 215/40 R18 is 10mm wider than the narrowest dimension (205) and 110mm narrower than the widest one (325). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (215mm), which results in 86mm sidewall height.