Firestone Roadhawk 185/55 R15

Firestone Roadhawk is a summer tyre made in total of 174 sizes, ranging from R13 to R13 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 20mm wider than the narrowest dimension (165) and 110mm narrower than the widest one (295). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (185mm), which results in 101.75mm sidewall height. In 185/55 R15, Roadhawk usually competes against Summer, which is a tyre from Cooper with a rating of 76%, compared to 60% of the Firestone in question.