315/40 R21 Firestone Roadhawk 2 variants

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Firestone Roadhawk 2 is a summer tyre made in total of 56 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 120mm wider than the narrowest dimension (195) and -40mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height. In 315/40 R21, Roadhawk 2 usually competes against Turanza 6, which is a tyre from Bridgestone with a rating of 83%, compared to 80% of the Firestone in question.