Nokian WR SUV 4 is a winter tyre made in total of 69 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 WR SUV 4 - "H", which is good for speeds up to 210 km/h. In 215/55 R18, WR SUV 4 usually competes against WR SUV 3, which is a tyre from Nokian with a rating of 0%, compared to 26% of the Nokian in question.