Pirelli WINTER SOTTOZERO Serie III 305/35 R21

Pirelli WINTER SOTTOZERO Serie III is a winter tyre made in total of 228 sizes, ranging from R16 to R16 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 305/35 R21 is 100mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (315). This tyre profile of 35 means the sidewall height of the tyre is 35% of the tyre width (305mm), which results in 106.75mm sidewall height.