285/40 R20 Firestone Roadhawk variants

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Firestone Roadhawk is a summer tyre made in total of 148 sizes, ranging from R15 to R15 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/40 R20 is 120mm wider than the narrowest dimension (165) and 10mm narrower than the widest one (295). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (285mm), which results in 114mm sidewall height. In 285/40 R20, Roadhawk usually competes against RainSport 5, which is a tyre from Uniroyal with a rating of 64%, compared to 59% of the Firestone in question.