Kleber Dynaxer HP3 is a summer tyre made in total of 125 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 60mm wider than the narrowest dimension (165) and 30mm narrower than the widest one (255). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In 225/40 R18, there is only one possible speed index for Kleber Dynaxer HP3 - "Y", which is good for speeds up to 300 km/h. In 225/40 R18, Dynaxer HP3 usually competes against ZIEX ZE310 ECORUN, which is a tyre from Falken with a rating of 75%, compared to 0% of the Kleber in question.