GoodYear UltraGrip Performance+ is a winter tyre made in total of 176 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/45 R18 is 40mm wider than the narrowest dimension (195) and 40mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (235mm), which results in 105.75mm sidewall height. In 235/45 R18, there is only one possible speed index for GoodYear UltraGrip Performance+ - "V", which is good for speeds up to 240 km/h. In 235/45 R18, UltraGrip Performance+ usually competes against Blizzak LM-005, which is a tyre from Bridgestone with a rating of 88%, compared to 85% of the GoodYear in question.
