Nokian WR SUV 3 is a winter tyre made in total of 62 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/55 R18 is 20mm wider than the narrowest dimension (235) and 60mm narrower than the widest one (315). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (255mm), which results in 140.25mm sidewall height. In 255/55 R18, there is only one possible speed index for Nokian WR SUV 3 - "V", which is good for speeds up to 240 km/h. Latest test in 255/55 R18 was held by Autobild in 2016, where WR SUV 3 received rating "Sufficient" and finished on the 7. place. It was tested on a .