Kleber KRISALP HP3 is a winter tyre made in total of 107 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/40 R18 is 100mm wider than the narrowest dimension (155) and -60mm narrower than the widest one (195). 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 R18, KRISALP HP3 usually competes against WinterExpert, which is a tyre from Uniroyal with a rating of 64%, compared to 73% of the Kleber in question.