Bridgestone Potenza Sport 255/45 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. 255/45 R21 is 50mm wider than the narrowest dimension (205) and 100mm narrower than the widest one (355). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height. In 255/45 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.