Hankook Kinergy 4S2 H750 is a allround tyre made in total of 135 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/50 R18 is 80mm wider than the narrowest dimension (155) and 50mm narrower than the widest one (285). This tyre profile of 50 means the sidewall height of the tyre is 50% of the tyre width (235mm), which results in 117.5mm sidewall height. In 235/50 R18, there is only one possible speed index for Hankook Kinergy 4S2 H750 - "V", which is good for speeds up to 240 km/h.