Pirelli P ZERO 355/25 R21

Pirelli P ZERO is a summer tyre made in total of 332 sizes, ranging from R17 to R17 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 355/25 R21 is 150mm wider than the narrowest dimension (205) and -20mm narrower than the widest one (335). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (355mm), which results in 88.75mm sidewall height.