315/30 R21 Bridgestone Potenza S001 variants

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Bridgestone Potenza S001 is a summer tyre made in total of 151 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/30 R21 is 110mm wider than the narrowest dimension (205) and -10mm narrower than the widest one (305). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (315mm), which results in 94.5mm sidewall height.