Cooper Discoverer Winter 275/45 R20

Cooper Discoverer Winter is a winter tyre made in total of 56 sizes, ranging from R16 to R16 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 275/45 R20 is 70mm wider than the narrowest dimension (205) and 20mm narrower than the widest one (295). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (275mm), which results in 123.75mm sidewall height.