BFGoodrich Advantage SUV is a summer tyre made in total of 25 sizes, ranging from R15 to R15 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/45 R20 is 70mm wider than the narrowest dimension (185) and 0mm narrower than the widest one (255). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height. In 255/45 R20, there is only one possible speed index for BFGoodrich Advantage SUV - "W", which is good for speeds up to 270 km/h. In 255/45 R20, Advantage SUV usually competes against ZEON 4xS Sport, which is a tyre from Cooper with a rating of 36%, compared to 32% of the BFGoodrich in question.