Cooper Summer is a summer tyre made in total of 163 sizes, ranging from R14 to R14 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 255/45 R18 is 90mm wider than the narrowest dimension (165) and 20mm narrower than the widest one (275). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (255mm), which results in 114.75mm sidewall height. In
255/45 R18, Summer usually competes against
Roadhawk, which is a tyre from
Firestone with a rating of 60%, compared to 76% of the
Cooper in question.
Summer
