Pirelli P ZERO 305/25 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. 305/25 R21 is 100mm wider than the narrowest dimension (205) and 30mm narrower than the widest one (335). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (305mm), which results in 76.25mm sidewall height.