Bridgestone Alenza Sport All Season 315/40 R21

Bridgestone Alenza Sport All Season is a allround tyre made in total of 9 sizes, ranging from R19 to R19 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 315/40 R21 is 60mm wider than the narrowest dimension (255) and 0mm narrower than the widest one (315). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (315mm), which results in 126mm sidewall height.