GoodYear UltraGrip 9+ is a winter tyre made in total of 36 sizes, ranging from R14 to R14 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/55 R17 is 60mm wider than the narrowest dimension (155) and -10mm narrower than the widest one (205). 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 R17, UltraGrip 9+ usually competes against Winter i*cept RS2 W452, which is a tyre from Hankook with a rating of 72%, compared to 79% of the GoodYear in question.