Bridgestone Blizzak 6 215/40 R18

Bridgestone Blizzak 6 is a winter tyre made in total of 225 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 215/40 R18 is 30mm wider than the narrowest dimension (185) and 110mm narrower than the widest one (325). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (215mm), which results in 86mm sidewall height.