Kleber Dynaxer UHP is a summer tyre made in total of 44 sizes, ranging from R17 to R17 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 255/40 R19 is 60mm wider than the narrowest dimension (195) and 0mm narrower than the widest one (255). 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 Kleber Dynaxer UHP - "Y", which is good for speeds up to 300 km/h. In 255/40 R19, Dynaxer UHP usually competes against Quatrac Pro+, which is a tyre from Vredestein with a rating of 52%, compared to 48% of the Kleber in question.