Pirelli Winter Sottozero 3 355/25 R21

Pirelli Winter Sottozero 3 is a winter tyre made in total of 27 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 355/25 R21 is 150mm wider than the narrowest dimension (205) and 0mm narrower than the widest one (355). This tyre profile of 25 means the sidewall height of the tyre is 25% of the tyre width (355mm), which results in 88.75mm sidewall height.