Bridgestone Blizzak 6 305/30 R20

Bridgestone Blizzak 6 is a winter tyre made in total of 225 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 305/30 R20 is 120mm wider than the narrowest dimension (185) and 20mm narrower than the widest one (325). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (305mm), which results in 91.5mm sidewall height.