Yokohama Advan Winter V907 is a winter tyre made in total of 18 sizes, ranging from R19 to R19 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 275/40 R19 is 50mm wider than the narrowest dimension (225) and 10mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (275mm), which results in 110mm sidewall height. In 275/40 R19, there is only one possible speed index for Yokohama Advan Winter V907 - "V", which is good for speeds up to 240 km/h.