Yokohama BLUEARTH-GT AE51 is a summer tyre made in total of 59 sizes, ranging from R14 to R14 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 245/40 R19 is 90mm wider than the narrowest dimension (155) and 0mm narrower than the widest one (245). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R19, there is only one possible speed index for Yokohama BLUEARTH-GT AE51 - "W", which is good for speeds up to 270 km/h. In 245/40 R19, BLUEARTH-GT AE51 usually competes against ZEON CS8, which is a tyre from Cooper with a rating of 42%, compared to 0% of the Yokohama in question.