Cooper Discoverer STT PRO 275/65 R18

Cooper Discoverer STT PRO is a tyre made in total of 45 sizes, ranging from R13 to R13 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 275/65 R18 is 244mm wider than the narrowest dimension (31) and 30mm narrower than the widest one (305). This tyre profile of 65 means the sidewall height of the tyre is 65% of the tyre width (275mm), which results in 178.75mm sidewall height.