Bridgestone Potenza Sport 325/30 R21

Bridgestone Potenza Sport is a summer tyre made in total of 205 sizes, ranging from R13 to R13 - 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 30mm narrower than the widest one (355). 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. In 325/30 R21, Potenza Sport usually competes against P ZERO PZ4, which is a tyre from Pirelli with a rating of 89%, compared to 87% of the Bridgestone in question.