Pirelli P ZERO PZ4 255/70 R18

Pirelli P ZERO PZ4 is a summer tyre made in total of 700 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/70 R18 is 110mm wider than the narrowest dimension (145) and 80mm narrower than the widest one (335). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (255mm), which results in 178.5mm sidewall height.