Pirelli P ZERO 255/40 R17

Pirelli P ZERO is a summer tyre made in total of 332 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 255/40 R17 is 50mm wider than the narrowest dimension (205) and 80mm narrower than the widest one (335). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height.