Goodyear Eagle F1 Supersport 255/45 R21

Goodyear Eagle F1 Supersport is a summer tyre made in total of 154 sizes, ranging from R13 to R13 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 255/45 R21 is 50mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height.