Pirelli Scorpion ZERO All Season 275/50 R21

Pirelli Scorpion ZERO All Season is a summer tyre made in total of 73 sizes, ranging from R13 to R13 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 275/50 R21 is 40mm wider than the narrowest dimension (235) and 50mm narrower than the widest one (325). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (275mm), which results in 137.5mm sidewall height.