Hankook H750 Kinergy 4S2 is a allround tyre made in total of 42 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 245/45 R18 is 80mm wider than the narrowest dimension (165) and 10mm narrower than the widest one (255). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height. In 245/45 R18, there is only one possible speed index for Hankook H750 Kinergy 4S2 - "Y", which is good for speeds up to 300 km/h. In 245/45 R18, H750 Kinergy 4S2 usually competes against Aspire XP, which is a tyre from Apollo with a rating of 0%, compared to 0% of the Hankook in question.