Pirelli Pzero 275/40 R20

Pirelli Pzero is a tyre made in total of 18 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/40 R20 is 70mm wider than the narrowest dimension (205) and 50mm narrower than the widest one (325). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height.