Hankook Ventus Evo is a summer tyre made in total of 41 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/55 R18 is 10mm wider than the narrowest dimension (225) and 80mm narrower than the widest one (315). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (235mm), which results in 129.25mm sidewall height. In 235/55 R18, there is only one possible speed index for Hankook Ventus Evo - "V", which is good for speeds up to 240 km/h. In 235/55 R18, Ventus Evo usually competes against Turanza T005, which is a tyre from Bridgestone with a rating of 91%, compared to 90% of the Hankook in question.