GoodYear Eagle F1 Supersport R 315/30 R21

GoodYear Eagle F1 Supersport R is a summer tyre made in total of 22 sizes, ranging from R18 to R18 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/30 R21 is 110mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (335). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (315mm), which results in 94.5mm sidewall height.