Yokohama BluEarth winter V905 is a winter tyre made in total of 141 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 40mm narrower than the widest one (295). 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 Yokohama BluEarth winter V905 - "V", which is good for speeds up to 240 km/h. In 255/45 R20, BluEarth winter V905 usually competes against EuroWinter HS01, which is a tyre from Falken with a rating of 61%, compared to 0% of the Yokohama in question.