Kleber Quadraxer 3 is a allround tyre made in total of 104 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/40 R18 is 70mm wider than the narrowest dimension (165) and -40mm narrower than the widest one (195). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (235mm), which results in 94mm sidewall height. In 235/40 R18, there is only one possible speed index for Kleber Quadraxer 3 - "W", which is good for speeds up to 270 km/h. In 235/40 R18, Quadraxer 3 usually competes against G-Grip All Season 2, which is a tyre from BFGoodrich with a rating of 48%, compared to 90% of the Kleber in question.