Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 0 + 0 road tests and 973 + 16 owner reviews. How we score
Discoverer A/T3 leads, 69–66 Narrow edge
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Tests – · none yet Owners 67 · 973 reviews
“I have a set of 275/60R20 on my dodge work truck. Coming up on 35k. Oilfield roads. These tires are ride smooth and are quiet. They have done well in the snow and mud for me. I will purchase a set of these for my own personal truck once needed. These are great tires.”
Tests – · none yet Owners 64 · 16 reviews
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Professional tests (TWG score) | ≈ 71 (est.) | ≈ 66 (est.) |
| Reviews found online | 75 | 63 |
Discoverer A/T3: 60% × 71 (est.) + 40% × 74.9 = 73
Open Country All Terrain: 60% × 66 (est.) + 40% × 63.1 = 65
No road tests of dry for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
No road tests of dry for Open Country All Terrain. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Professional tests (TWG score) | ≈ 74 (est.) | ≈ 69 (est.) |
| Reviews found online | 76 | 67 |
Discoverer A/T3: 60% × 73.9 (est.) + 40% × 76.4 = 75
Open Country All Terrain: 60% × 68.7 (est.) + 40% × 67.1 = 68
No road tests of wet for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
No road tests of wet for Open Country All Terrain. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Professional tests (TWG score) | ≈ 70 (est.) | ≈ 66 (est.) |
| Reviews found online | 68 | 59 |
Discoverer A/T3: 60% × 69.7 (est.) + 40% × 67.9 = 69
Open Country All Terrain: 60% × 66.5 (est.) + 40% × 59.3 = 64
No road tests of snow for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
No road tests of snow for Open Country All Terrain. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Professional tests (TWG score) | ≈ 69 (est.) | ≈ 68 (est.) |
| Reviews found online | 67 | 64 |
Discoverer A/T3: 40% × 68.8 (est.) + 60% × 67.1 = 68
Open Country All Terrain: 40% × 68.1 (est.) + 60% × 63.6 = 65
No road tests of comfort for Discoverer A/T3 or Open Country All Terrain. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Professional tests (TWG score) | ≈ 67 (est.) | – |
| Reviews found online | 65 | – |
Discoverer A/T3: 60% × 66.6 (est.) + 40% × 65.4 = 66
No road tests of noise for Discoverer A/T3. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Professional tests (TWG score) | ≈ 61 (est.) | ≈ 66 (est.) |
| Reviews found online | 52 | 67 |
Discoverer A/T3: 60% × 61.1 (est.) + 40% × 51.6 = 57
Open Country All Terrain: 60% × 66.4 (est.) + 40% × 66.8 = 67
No road tests of treadwear for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
No road tests of treadwear for Open Country All Terrain. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
| Source | Discoverer A/T3 | Open Country All Terrain |
|---|---|---|
| Reviews found online | 65 | 63 |
| Category | Cooper Discoverer A/T3 | Toyo Open Country All Terrain |
|---|---|---|
| Relative Score | 69 | 66 |
| Dry | 73 | 65 |
| Wet | 75 | 68 |
| Snow | 69 | 64 |
| Comfort | 68 | 65 |
| Noise | 66 | – |
| Treadwear | 57 | 67 |
| Handling (owners) | 65 | 63 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
Wet grip starts at “Important”. Treadwear starts at “Neutral” here: road tests measured it for at most one of the two tires, so it rests on owner reviews. Move the sliders and the scores update instantly.
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Discoverer A/T3
Open Country All Terrain
Only categories both tires have data for count toward the headline score.
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
From Reddit, forums and review threads. Not part of our score
The community expresses overwhelmingly positive feedback for the Cooper Discoverer A/T3, praising its strong performance on the highway, good wet and snow traction, and smooth, relatively quiet ride quality. Many users note that the tires wear well over tens of thousands of miles, though some mention that they can get slightly louder as they age and tend to pack up in deep mud. Overall, users consider them to be reliable, high-value all-terrain tires suitable for daily driving, towing, and light off-roading.
“Put a set on a day after I purchased my truck. Have about 8500 miles on them and no complaints whatsoever. Been on a 3000 trip with them not towing and a 2400 mile trip towing a 8K travel trailer. No problems on either trip. I'll get another set when these wear out, hopefully many miles down the road. No sign of wear yet!”
“I have a set of 275/60R20 on my dodge work truck. Coming up on 35k. Oilfield roads. These tires are ride smooth and are quiet. They have done well in the snow and mud for me. I will purchase a set of these for my own personal truck once needed. These are great tires.”
“Been running them on the wifes truck for 3 or 4 years now. They are a good tire, very little noise on pavement, does fine on snow. Cooper Discoverer A/T3 Review”
Based on 25 community posts
We haven't collected enough community discussion about this tire yet.
| Attribute | A · Cooper Discoverer A/T3 | B · Toyo Open Country All Terrain |
|---|---|---|
| Category | All-Terrain tire | All-Terrain tire |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 14 | — |
| Rim diameters | 15″ – 22″ | — |
| Tread depth | 14 - 17/32″ | — |
| UTQG | 560 A B | — |
| Sidewall | Black Side Wall - Raised Outline White Lettering | — |
| Max pressure | 44 - 80 psi | — |
Cooper Discoverer A/T3
Toyo Open Country All Terrain
Narrow edge: Cooper Discoverer A/T3 — better dry, wet and snow. Pick the Toyo Open Country All Terrain if treadwear matters most to you. Toyo Open Country All Terrain rests on little evidence so far (0 tests, 16 reviews), so read this result as provisional.
Toyo Open Country All Terrain scores 67 vs 57 on treadwear.
Cooper Discoverer A/T3 scores 73 vs 65 on dry.
Cooper Discoverer A/T3 scores 75 vs 68 on wet.
Cooper Discoverer A/T3 scores 69 vs 64 on snow.
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Cooper Discoverer A/T3, 75 vs 68 on our wet score.
Cooper Discoverer A/T3, 73 vs 65 on our dry score.
Cooper Discoverer A/T3, 69 vs 64 on our snow score.
Cooper Discoverer A/T3, 68 vs 65 on our comfort score.
Toyo Open Country All Terrain, 67 vs 57 on our treadwear score.
Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements), each result compared with every other tire in the same test and newer tests counting more. 40% comes from owner reviews found online, adjusted for how generously each site rates. Both use one scale: the average tested tire gets 70, the best 100. When a tire has only one of the two, the missing half is estimated from the other and the score stays closer to average; with no road test and fewer than five owner reviews it gets no score yet.
Handling is the exception: road tests measure it inside the dry and wet scores, so its own row comes from owner ratings only and starts as less important.
Community buzz from Reddit and forums is shown for context only — it never changes the score. Full methodology
