Continental EcoContact 6 is a summer tyre made in total of 304 sizes, ranging from R13 to R13 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/45 R20 is 100mm wider than the narrowest dimension (155) and 60mm narrower than the widest one (315). 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 are 2 possible speed indexes for Continental EcoContact 6 - "V","W", which are good for speeds up to 240, 270 km/h. In 255/45 R20, EcoContact 6 usually competes against Turanza T005, which is a tyre from Bridgestone with a rating of 89%, compared to 68% of the Continental in question.