Hankook Ventus ST RH06 is a summer tyre made in total of 10 sizes, ranging from R17 to R17 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (275mm), which results in 151.25mm sidewall height. In 275/55 R17, there is only one possible speed index for Hankook Ventus ST RH06 - "V", which is good for speeds up to 240 km/h.