Hankook H750 Kinergy 4S2 is a allround tyre made in total of 42 sizes, ranging from R14 to R14 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 195/55 R15 is 30mm wider than the narrowest dimension (165) and 60mm narrower than the widest one (255). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (195mm), which results in 107.25mm sidewall height. In 195/55 R15, there is only one possible speed index for Hankook H750 Kinergy 4S2 - "V", which is good for speeds up to 240 km/h.