Bridgestone Potenza Sport Evo 325/30 R21

Bridgestone Potenza Sport Evo is a summer tyre made in total of 105 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 325/30 R21 is 120mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (325). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (325mm), which results in 97.5mm sidewall height.