Goodyear UltraGrip 9 is a winter tyre made in total of 39 sizes, ranging from R14 to R14 - this particular dimension is R15, which means it fits to a 15 inch/381mm diameter wheel. 185/55 R15 is 30mm wider than the narrowest dimension (155) and 20mm narrower than the widest one (205). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (185mm), which results in 101.75mm sidewall height. In 185/55 R15, there is only one possible speed index for Goodyear UltraGrip 9 - "T", which is good for speeds up to 190 km/h. In 185/55 R15, UltraGrip 9 usually competes against Winter i*cept RS2 W452, which is a tyre from Hankook with a rating of 0%, compared to 0% of the Goodyear in question.
