Firestone Roadhawk 225/45 R18

Firestone Roadhawk is a summer tyre made in total of 165 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/45 R18 is 60mm wider than the narrowest dimension (165) and 70mm narrower than the widest one (295). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (225mm), which results in 101.25mm sidewall height. In 225/45 R18, Roadhawk usually competes against Summer, which is a tyre from Cooper with a rating of 55%, compared to 52% of the Firestone in question.