Firestone Roadhawk 275/40 R20

Firestone Roadhawk is a summer tyre made in total of 165 sizes, ranging from R15 to R15 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/40 R20 is 110mm wider than the narrowest dimension (165) and 20mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height. In 275/40 R20, Roadhawk usually competes against Dynaxer HP5, which is a tyre from Kleber with a rating of 51%, compared to 52% of the Firestone in question.