Goodyear UltraGrip 9 is a winter tyre made in total of 39 sizes, ranging from R14 to R14 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 215/45 R17 is 60mm wider than the narrowest dimension (155) and -10mm narrower than the widest one (205). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (215mm), which results in 96.75mm sidewall height. In 215/45 R17, UltraGrip 9 usually competes against Blizzak LM-001, which is a tyre from Bridgestone with a rating of 0%, compared to 0% of the Goodyear in question.