Cooper Discoverer STT PRO POR 315/70 R17

Cooper Discoverer STT PRO POR is a summer tyre made in total of 29 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 315/70 R17 is 100mm wider than the narrowest dimension (215) and -10mm narrower than the widest one (305). This tyre profile of 70 means the sidewall height of the tyre is 70% of the tyre width (315mm), which results in 220.5mm sidewall height.