Continental Contact CST17 155/90 R18

Continental Contact CST17 is a summer tyre made in total of 14 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 155/90 R18 is 20mm wider than the narrowest dimension (135) and 10mm narrower than the widest one (165). This tyre profile of 90 means the sidewall height of the tyre is 90% of the tyre width (155mm), which results in 139.5mm sidewall height.