Pirelli P Zero R is a summer tyre made in total of 30 sizes, ranging from R19 to R19 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 345/25 R21 is 110mm wider than the narrowest dimension (235) and -20mm narrower than the widest one (325). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (345mm), which results in 86.25mm sidewall height.
Summer