Yokohama BluEarth winter V906 is a winter tyre made in total of 30 sizes, ranging from R15 to R15 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/40 R20 is 70mm wider than the narrowest dimension (185) and 30mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (255mm), which results in 102mm sidewall height. In 255/40 R20, there is only one possible speed index for Yokohama BluEarth winter V906 - "W", which is good for speeds up to 270 km/h. In 255/40 R20, BluEarth winter V906 usually competes against WinterCraft WP52, which is a tyre from Kumho with a rating of 55%, compared to 49% of the Yokohama in question.