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. 245/40 R18 is 90mm wider than the narrowest dimension (155) and 10mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R18, there is only one possible speed index for BFGoodrich Advantage - "Y", which is good for speeds up to 300 km/h. In 245/40 R18, Advantage usually competes against ZIEX ZE310 ECORUN, which is a tyre from Falken with a rating of 75%, compared to 68% of the BFGoodrich in question.