Cooper Discoverer STT PRO POR 305/70 R18

Cooper Discoverer STT PRO POR is a summer tyre made in total of 29 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 305/70 R18 is 90mm wider than the narrowest dimension (215) and 0mm narrower than the widest one (305). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (305mm), which results in 213.5mm sidewall height.