Goodyear Eagle F1 Supersport is a summer tyre made in total of 143 sizes, ranging from R18 to R18 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/40 R18 is 50mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In
255/40 R18, Eagle F1 Supersport usually competes against
Ventus S1 evo3 K127, which is a tyre from
Hankook with a rating of 75%, compared to 73% of the
Goodyear in question.