Yokohama Advan Winter V907 255/40 R20

Yokohama Advan Winter V907 is a winter tyre made in total of 40 sizes, ranging from R19 to R19 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 255/40 R20 is 30mm wider than the narrowest dimension (225) and 60mm narrower than the widest one (315). 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.