Continental ContiTour 180/55 R18

Continental ContiTour is a summer tyre made in total of 20 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 180/55 R18 is 50mm wider than the narrowest dimension (130) and -50mm narrower than the widest one (130). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (180mm), which results in 99mm sidewall height.