Hankook Ventus V12 evo2 K120 is a summer tyre made in total of 46 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 40mm wider than the narrowest dimension (195) and 20mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (235mm), which results in 94mm sidewall height. In 235/40 R18, there is only one possible speed index for Hankook Ventus V12 evo2 K120 - "Y", which is good for speeds up to 300 km/h. In 235/40 R18, Ventus V12 evo2 K120 usually competes against Eagle F1 Supersport, which is a tyre from GoodYear with a rating of 71%, compared to 0% of the Hankook in question.