Hankook Winter i*cept evo3 W330 is a winter tyre made in total of 88 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/40 R18 is 40mm wider than the narrowest dimension (215) and 0mm narrower than the widest one (255). 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 Hankook Winter i*cept evo3 W330 - "V", which is good for speeds up to 240 km/h. In 255/40 R18, Winter i*cept evo3 W330 usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of 87%, compared to 89% of the Hankook in question.