Bridgestone Blizzak DM-V3 275/50 R21

Bridgestone Blizzak DM-V3 is a winter tyre made in total of 79 sizes, ranging from R15 to R15 - this particular dimension is R21, which means it fits to a 21 inch/533.4mm diameter wheel. 275/50 R21 is 70mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (285). 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.