Pirelli P ZERO 325/25 R20

Pirelli P ZERO is a summer tyre made in total of 332 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 325/25 R20 is 120mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (335). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (325mm), which results in 81.25mm sidewall height.