GoodYear Vector 4Seasons SUV Gen-3 is a allround tyre made in total of 29 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 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 is only one possible speed index for GoodYear Vector 4Seasons SUV Gen-3 - "T", which is good for speeds up to 190 km/h. In 255/45 R20, Vector 4Seasons SUV Gen-3 usually competes against Weather Control A005 EVO, which is a tyre from Bridgestone with a rating of 75%, compared to 94% of the GoodYear in question.