Pirelli P ZERO PZ4 285/25 R20

Pirelli P ZERO PZ4 is a summer tyre made in total of 720 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/25 R20 is 140mm wider than the narrowest dimension (145) and 50mm narrower than the widest one (335). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (285mm), which results in 71.25mm sidewall height.