Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews. Based on 0 + 0 road tests and 973 + 119 owner reviews. How we score
Too close to call: Discoverer A/T3 69, Grabber X3 68.
Both Amazon links then search this exact size.
TireWheelGuide may earn a commission from purchases made through these links.
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 67 · 119 reviews
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Professional tests (TWG score) | ≈ 70 (est.) | ≈ 69 (est.) |
| Reviews found online | 73 | 71 |
Discoverer A/T3: 60% × 69.9 (est.) + 40% × 73.1 = 71
Grabber X3: 60% × 69.2 (est.) + 40% × 71.3 = 70
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 0.40).
No road tests of dry for Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.40).
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Professional tests (TWG score) | ≈ 72 (est.) | ≈ 70 (est.) |
| Reviews found online | 74 | 71 |
Discoverer A/T3: 60% × 72.3 (est.) + 40% × 74.3 = 73
Grabber X3: 60% × 70.4 (est.) + 40% × 70.8 = 71
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 0.56).
No road tests of wet for Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.56).
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Professional tests (TWG score) | ≈ 69 (est.) | ≈ 70 (est.) |
| Reviews found online | 66 | 70 |
Discoverer A/T3: 60% × 68.6 (est.) + 40% × 66.1 = 68
Grabber X3: 60% × 69.9 (est.) + 40% × 69.8 = 70
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 0.33).
No road tests of snow for Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.33).
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Professional tests (TWG score) | ≈ 69 (est.) | ≈ 67 (est.) |
| Reviews found online | 68 | 58 |
Discoverer A/T3: 60% × 68.9 (est.) + 40% × 68 = 69
Grabber X3: 60% × 67.2 (est.) + 40% × 58 = 64
No road tests of comfort for Discoverer A/T3 or Grabber X3. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Professional tests (TWG score) | ≈ 67 (est.) | ≈ 67 (est.) |
| Reviews found online | 66 | 52 |
Discoverer A/T3: 60% × 67.3 (est.) + 40% × 65.8 = 67
Grabber X3: 60% × 67.3 (est.) + 40% × 51.7 = 61
No road tests of noise for Discoverer A/T3 or Grabber X3. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Professional tests (TWG score) | ≈ 62 (est.) | ≈ 66 (est.) |
| Reviews found online | 54 | 65 |
Discoverer A/T3: 60% × 62 (est.) + 40% × 53.7 = 59
Grabber X3: 60% × 65.6 (est.) + 40% × 65.4 = 65
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 0.31).
No road tests of treadwear for Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.31).
| Source | Discoverer A/T3 | Grabber X3 |
|---|---|---|
| Reviews found online | 65 | 58 |
| Category | Cooper Discoverer A/T3 | General Grabber X3 |
|---|---|---|
| Relative Score | 69 | 68 |
| Dry | 71 | 70 |
| Wet | 73 | 71 |
| Snow | 68 | 70 |
| Comfort | 69 | 64 |
| Noise | 67 | 61 |
| Treadwear | 59 | 65 |
| Handling (owners) | 65 | 58 |
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.
Discoverer A/T3
Grabber X3
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
From Reddit, forums and review threads. Not part of our score
Community sentiment for the Cooper Discoverer A/T3 is overwhelmingly positive, with users frequently praising its low road noise, smooth ride, and strong snow and wet traction. Owners appreciate its long tread life, solid towing capability, and reasonable value, though some note it packs up quickly in thick mud and can become slightly louder as it wears.
“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 24 community posts
We haven't collected enough community discussion about this tire yet.
| Attribute | A · Cooper Discoverer A/T3 | B · General Grabber X3 |
|---|---|---|
| Category | All-Terrain tire | Mud-Terrain tire |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 14 | 6 |
| Rim diameters | 15″ – 22″ | 16″ – 18″ |
| Tread depth | 14 - 17/32″ | 18 - 21/32″ |
| UTQG | 560 A B | AA A |
| Sidewall | Black Side Wall - Raised Outline White Lettering | Black Side Wall - Serrated Raised Lettering |
| Max pressure | 44 - 80 psi | 35 - 80 psi |
| Sizes in common | 1 | 1 |
Cooper Discoverer A/T3
General Grabber X3
Too close to call: Cooper Discoverer A/T3 and General Grabber X3 are within 2 points overall. Cooper Discoverer A/T3 is stronger on handling, noise and comfort. General Grabber X3 is stronger on treadwear.
Cooper Discoverer A/T3 scores 65 vs 58 on handling.
Cooper Discoverer A/T3 scores 67 vs 61 on noise.
General Grabber X3 scores 65 vs 59 on treadwear.
Cooper Discoverer A/T3 scores 69 vs 64 on comfort.
TireWheelGuide may earn a commission from purchases made through these links.
Neither, by our numbers: 73 vs 71 on the wet score, within 3 points.
Neither, by our numbers: 71 vs 70 on the dry score, within 3 points.
Neither, by our numbers: 68 vs 70 on the snow score, within 3 points.
Cooper Discoverer A/T3, 67 vs 61 on our noise score.
Cooper Discoverer A/T3, 69 vs 64 on our comfort score.
General Grabber X3, 65 vs 59 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
