Yokohama W.drive V905 is a winter tyre made in total of 8 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 245/45 R20 is 40mm wider than the narrowest dimension (205) and 10mm narrower than the widest one (255). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (245mm), which results in 110.25mm sidewall height. In 245/45 R20, W.drive V905 usually competes against MS Plus 77, which is a tyre from Uniroyal with a rating of 55%, compared to 0% of the Yokohama in question.