Michelin CrossClimate SUV is a allround tyre made in total of 42 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/45 R20 is 40mm wider than the narrowest dimension (215) and 20mm narrower than the widest one (275). 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 Michelin CrossClimate SUV - "W", which is good for speeds up to 270 km/h. In 255/45 R20, CrossClimate SUV usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 75%, compared to 83% of the Michelin in question.