Firestone Firehawk Sport 255/30 R20

Firestone Firehawk Sport is a summer tyre made in total of 36 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/30 R20 is 40mm wider than the narrowest dimension (215) and 20mm narrower than the widest one (275). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (255mm), which results in 76.5mm sidewall height.