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. 235/40 R18 is 70mm wider than the narrowest dimension (165) and 40mm narrower than the widest one (275). 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, 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
