Bridgestone Blizzak 6 is a winter tyre made in total of 86 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/40 R18 is 50mm wider than the narrowest dimension (205) and 60mm narrower than the widest one (315). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In 255/40 R18, there is only one possible speed index for Bridgestone Blizzak 6 - "V", which is good for speeds up to 240 km/h. In 255/40 R18, Blizzak 6 usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of %, compared to 97% of the Bridgestone in question.