Tyre comparison
Cooper Discoverer AT3 4S vs Toyo Open Country A/T III
The Open Country A/T III scores higher for every kind of driver we tested. Choose the Discoverer AT3 4S for quiet & comfort. Choose the Open Country A/T III for wet grip. The Discoverer AT3 4S usually costs less.
Fit score by driver
The same 0–100 score the calculator ranks tyres by, weighted for each kind of driver. How we score
| Driver | Discoverer AT3 4S | Open Country A/T III |
|---|---|---|
| Gravel and towing | 56 | 64 (higher) |
| Mostly bitumen | 55 | 63 (higher) |
| Longest life | 58 | 60 (higher) |
Trait by trait
Out of 10, against other all-terrain tyres.
Discoverer AT3 4S
Where the scores come from
Estimated: no independent test of this tyre found
No test found in snippets; maker warranty/positioning.
Data last reviewed: October 2026
Open Country A/T III
Where the scores come from
Independent tests
- Tested by
- ADAC
- Year
- 2025
ADAC AT 2025: wet braking 43.4 m (best of those seen); stiff ride, high noise.
Data last reviewed: October 2026
Questions
Which is better, the Discoverer AT3 4S or the Open Country A/T III?
The Open Country A/T III scores higher for every kind of driver we tested. Choose the Discoverer AT3 4S for quiet & comfort. Choose the Open Country A/T III for wet grip. The Discoverer AT3 4S usually costs less.
Where do these ratings come from?
From independent tyre tests where they exist (ADAC, Auto Bild, Tyre Reviews, evo, Tire Rack and others), rated 1 to 10 against other tyres in the same category, last reviewed October 2026. Neither tyre maker nor any retailer can change them.