Nokian Seasonproof SUV is a allround tyre made in total of 19 sizes, ranging from R16 to R16 - 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 (215mm), which results in 118.25mm sidewall height. In 215/55 R18, there is only one possible speed index for Nokian Seasonproof SUV - "V", which is good for speeds up to 240 km/h. In 215/55 R18, Seasonproof SUV usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 75%, compared to 62% of the Nokian in question.