Pirelli WINTER 240 SOTTOZERO 285/30 R20

Pirelli WINTER 240 SOTTOZERO is a winter tyre made in total of 14 sizes, ranging from R17 to R17 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/30 R20 is 50mm wider than the narrowest dimension (235) and 20mm narrower than the widest one (305). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (285mm), which results in 85.5mm sidewall height.