Cooper Discoverer Winter is a winter tyre made in total of 56 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 215/55 R18 is 10mm wider than the narrowest dimension (205) and 80mm narrower than the widest one (295). This tyre profile of 55 means the sidewall height of the tyre is 55% of the tyre width (215mm), which results in 118.25mm sidewall height. In 215/55 R18, there is only one possible speed index for Cooper Discoverer Winter - "V", which is good for speeds up to 240 km/h. In 215/55 R18, Discoverer Winter usually competes against Wintrac Pro, which is a tyre from Vredestein with a rating of 54%, compared to 0% of the Cooper in question.
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Relevant tyre tests in same or similiar dimension (215/55 R18)

| Name | Wet | Dry | Snow | Running costs | |||
|---|---|---|---|---|---|---|---|
| Best values in test | 2+ | 2+ | 2+ | 2+ | |||
| Cooper Discoverer Winter | 2- | 2 | 2+ | 2- | |||
| Show test details | |||||||

| Name | Stopping distance on wet | Stopping distance on snow |
|---|---|---|
| Best values in test | 32,8 | 25,4 |
| Cooper Discoverer Winter | 35,1 | 26,3 |

| Name | Wet | Dry | Snow | ||||
|---|---|---|---|---|---|---|---|
| Best values in test | 2+ | 2 | 1 | ||||
| Cooper Discoverer Winter | 2 | 3+ | 1- | ||||
| Show test details | |||||||