Firestone Roadhawk is a summer tyre made in total of 154 sizes, ranging from R15 to R15 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/40 R19 is 90mm wider than the narrowest dimension (165) and 40mm narrower than the widest one (295). 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 R19, there is only one possible speed index for Firestone Roadhawk - "Y", which is good for speeds up to 300 km/h. In 255/40 R19, Roadhawk usually competes against Advantage, which is a tyre from BFGoodrich with a rating of %, compared to 57% of the Firestone in question.