BFGoodrich Advantage is a summer tyre made in total of 146 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/45 R18 is 80mm wider than the narrowest dimension (155) and 20mm narrower than the widest one (255). 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 are 2 possible speed indexes for BFGoodrich Advantage - "Y","W", which are good for speeds up to 300, 270 km/h. In 235/45 R18, Advantage usually competes against RainSport 3, which is a tyre from Uniroyal with a rating of 56%, compared to 76% of the BFGoodrich in question.