Bridgestone Alenza Sport All Season 275/50 R20

Bridgestone Alenza Sport All Season is a allround tyre made in total of 9 sizes, ranging from R19 to R19 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/50 R20 is 20mm wider than the narrowest dimension (255) and 40mm narrower than the widest one (315). 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.