GoodYear UltraGrip Performance+ is a winter tyre made in total of 177 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/55 R18 is 30mm wider than the narrowest dimension (195) and 50mm narrower than the widest one (275). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (225mm), which results in 123.75mm sidewall height. In 225/55 R18, there is only one possible speed index for GoodYear UltraGrip Performance+ - "V", which is good for speeds up to 240 km/h. In 225/55 R18, UltraGrip Performance+ usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of 87%, compared to 82% of the GoodYear in question.
