Pirelli P ZERO Corsa 345/30 R21

Pirelli P ZERO Corsa is a summer tyre made in total of 34 sizes, ranging from R19 to R19 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 345/30 R21 is 120mm wider than the narrowest dimension (225) and -20mm narrower than the widest one (325). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (345mm), which results in 103.5mm sidewall height.