Goodyear UltraGrip SUV is a winter tyre made in total of 9 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/60 R18 is 20mm wider than the narrowest dimension (235) and 0mm narrower than the widest one (255). This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (255mm), which results in 153mm sidewall height. In 255/60 R18, there is only one possible speed index for Goodyear UltraGrip SUV - "H", which is good for speeds up to 210 km/h. In 255/60 R18, UltraGrip SUV usually competes against WR SUV 3, which is a tyre from Nokian with a rating of 0%, compared to 0% of the Goodyear in question.