Goodyear Eagle F1 Supersport is a summer tyre made in total of 91 sizes, ranging from R18 to R18 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (205mm), which results in 82mm sidewall height. In 205/40 R18, there is only one possible speed index for Goodyear Eagle F1 Supersport - "Y", which is good for speeds up to 300 km/h. In 205/40 R18, Eagle F1 Supersport usually competes against Pilot Sport 4, which is a tyre from Michelin with a rating of 75%, compared to 68% of the Goodyear in question.