Uniroyal RainSport 3 SUV is a summer tyre made in total of 19 sizes, ranging from R17 to R17 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 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 are 2 possible speed indexes for Uniroyal RainSport 3 SUV - "H","V", which are good for speeds up to 210, 240 km/h.