315/35 R21 Bridgestone Potenza Sport variants

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Bridgestone Potenza Sport is a summer tyre made in total of 133 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/35 R21 is 110mm wider than the narrowest dimension (205) and -30mm narrower than the widest one (285). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (315mm), which results in 110.25mm sidewall height. In 315/35 R21, Potenza Sport usually competes against Pilot Sport 4 S, which is a tyre from Michelin with a rating of 86%, compared to 89% of the Bridgestone in question.