Pirelli WINTER 270 SOTTOZERO SERIE II 305/30 R21

Pirelli WINTER 270 SOTTOZERO SERIE II is a winter 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. 305/30 R21 is 70mm wider than the narrowest dimension (235) and 0mm narrower than the widest one (305). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (305mm), which results in 91.5mm sidewall height.