Cooper Discoverer STT PRO 285/75 R17

Cooper Discoverer STT PRO is a tyre made in total of 24 sizes, ranging from R16 to R16 - this particular dimension is R17, which means it fits to a 17 inch/431.8mm diameter wheel. 285/75 R17 is 70mm wider than the narrowest dimension (215) and 20mm narrower than the widest one (305). This tyre profile of 75 means the sidewall height of the tyre is 75% of the tyre width (285mm), which results in 213.75mm sidewall height.