Tests 74 · 1 test Owners 83 · 33 reviews
Best test result: #1 of 12 in 2024 Tire Rack All Terrain Tyres On-Road Test (wet braking)
Head-to-head
Updated
Nitto Terra Grappler G3 vs Cooper Discoverer Road Trail A/T — Compared
Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 1 + 1 road tests and 33 + 7 owner reviews. How we score
Terra Grappler G3 leads, 77–75 Narrow edge
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Tests 75 · 1 test Owners 77 · 7 reviews
Best test result: #1 of 12 in 2024 Tire Rack All Terrain Tyres On-Road Test (dry circle)
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
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84
Dry
Terra Grappler G3 +1074Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Professional tests (TWG score) · 1 / 1 tests 86 73 Reviews found online 81 75 Dry Braking (% of best) · 1 shared test · wins 1–0 100% 94% Dry Circle (% of best) · 1 shared test · wins 0–0 100% 100% Terra Grappler G3: 60% × 86.1 + 40% × 81.4 = 84
Discoverer Road Trail A/T: 60% × 72.8 + 40% × 75.3 = 74
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86
Wet
Terra Grappler G3 +581Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Professional tests (TWG score) · 1 / 1 tests 87 79 Reviews found online 84 84 Wet Braking (% of best) · 1 shared test · wins 1–0 100% 92% Wet Circle (% of best) · 1 shared test · wins 1–0 100% 97% Wet Handling (% of best) · 1 shared test · wins 1–0 100% 98% Terra Grappler G3: 60% × 87 + 40% × 83.9 = 86
Discoverer Road Trail A/T: 60% × 78.6 + 40% × 83.9 = 81
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52
Snow
Discoverer Road Trail A/T +2072Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Professional tests (TWG score) · 1 / 1 tests 33 69 Reviews found online 80 76 Ice Braking (% of best) · 1 shared test · wins 0–1 85% 91% Ice Traction (% of best) · 1 shared test · wins 0–1 89% 93% Snow Braking (% of best) · 1 shared test · wins 0–1 78% 95% Snow Handling (% of best) · 1 shared test · wins 0–1 88% 95% Snow Traction (% of best) · 1 shared test · wins 0–1 81% 86% Snow Handling (tester's mark) (% of best) · 1 shared test · wins 0–1 65% 85% Terra Grappler G3: 60% × 33.2 + 40% × 80.4 = 52
Discoverer Road Trail A/T: 60% × 68.8 + 40% × 76 = 72
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76
Comfort
Discoverer Road Trail A/T +379Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Professional tests (TWG score) · 1 / 1 tests 71 78 Reviews found online 80 79 Comfort (tester's mark) (% of best) · 1 shared test · wins 0–1 87% 97% Terra Grappler G3: 40% × 70.7 + 60% × 79.5 = 76
Discoverer Road Trail A/T: 40% × 78.4 + 60% × 79 = 79
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71
Noise
Discoverer Road Trail A/T +172Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Professional tests (TWG score) · 1 / 1 tests 66 75 Reviews found online 78 ≈ 66 (est.) Noise (tester's mark) (% of best) · 1 shared test · wins 0–1 80% 93% Terra Grappler G3: 60% × 66.1 + 40% × 78 = 71
Discoverer Road Trail A/T: 60% × 75.5 + 40% × 66.4 (est.) = 72
No owner ratings of noise for Discoverer Road Trail A/T. The owner half is the owners’ average (66): owners’ noise ratings barely follow the road tests, so the tests say nothing about how owners would rate it.
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79
Treadwear
Terra Grappler G3 +970Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Professional tests (TWG score) ≈ 74 (est.) ≈ 69 (est.) Reviews found online 87 73 Terra Grappler G3: 60% × 73.9 (est.) + 40% × 87 = 79
Discoverer Road Trail A/T: 60% × 68.8 (est.) + 40% × 72.9 = 70
No road tests of treadwear for Terra Grappler G3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
No road tests of treadwear for Discoverer Road Trail A/T. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
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–
Handling (owners)
No comparison76Why this score
Source Terra Grappler G3 Discoverer Road Trail A/T Reviews found online – 76
Scores at a glance
| Category | Nitto Terra Grappler G3 | Cooper Discoverer Road Trail A/T |
|---|---|---|
| Relative Score | 77 | 75 |
| Dry | 84 | 74 |
| Wet | 86 | 81 |
| Snow | 52 | 72 |
| Comfort | 76 | 79 |
| Noise | 71 | 72 |
| Treadwear | 79 | 70 |
| Handling (owners) | – | 76 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
Weight the categories that matter to you
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.
Important
NotLessNeutralImportantMost
Important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Recomputed
Headline score
77
/ 100
Terra Grappler G3
75
/ 100
Discoverer Road Trail A/T
Only categories both tires have data for count toward the headline score.
The professional test results behind the scores
Per discipline: the average % of the best tire over every test both tires were in, and how many of those tests each one won. “Different tests” rows compare results from separate tests.
In the overall rankings of 2 tests that ran both, Nitto Terra Grappler G3 finished ahead 0 times and Cooper Discoverer Road Trail A/T 2 times.
| Discipline | Category | Terra Grappler G3 | Discoverer Road Trail A/T | Δ | Head-to-head |
|---|---|---|---|---|---|
| Dry Braking | Dry | 100% | 94% | +6.0 | 1–0 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Dry Circle | Dry | 100% | 100% | 0.0 | 0–0 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Wet Braking | Wet | 100% | 92% | +8.1 | 1–0 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Wet Circle | Wet | 100% | 97% | +3.3 | 1–0 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Wet Handling | Wet | 100% | 98% | +2.5 | 1–0 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Ice Braking | Snow | 85% | 91% | −6.7 | 0–1 in 1 shared test Newest: 2026 Tire Rack All Terrain Tyre Snow Test · 265/70 R17 |
| Ice Traction | Snow | 89% | 93% | −4.2 | 0–1 in 1 shared test Newest: 2026 Tire Rack All Terrain Tyre Snow Test · 265/70 R17 |
| Snow Braking | Snow | 78% | 95% | −16.7 | 0–1 in 1 shared test Newest: 2026 Tire Rack All Terrain Tyre Snow Test · 265/70 R17 |
| Snow Handling | Snow | 88% | 95% | −7.1 | 0–1 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Snow Handling (tester's mark) | Snow | 65% | 85% | −20.5 | 0–1 in 1 shared test Newest: 2026 Tire Rack All Terrain Tyre Snow Test · 265/70 R17 |
| Snow Traction | Snow | 81% | 86% | −5.1 | 0–1 in 1 shared test Newest: 2026 Tire Rack All Terrain Tyre Snow Test · 265/70 R17 |
| Comfort (tester's mark) | Comfort | 87% | 97% | −10.0 | 0–1 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Noise (tester's mark) | Noise | 80% | 93% | −13.3 | 0–1 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Also published by the testers (not in the score) | |||||
| Road Rating (tester's mark) | Other | 87% | 93% | −6.6 | 0–1 in 1 shared test Newest: 2024 Tire Rack All Terrain Tyres On-Road Test · 265/70 R17 |
| Overall Ranking | Overall | #27/30 | #9/30 | – | 0–2 in 2 shared tests Newest: 2026 Tire Rack All Terrain Tyre Snow Test · 265/70 R17 |
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Terra Grappler G3
Pros
- Exceptionally smooth and quiet highway ride compared to other all-terrain tires
- Impressive multi-weather traction excelling in rain, snow, ice, and mud
- Aggressive sidewall styling that enhances the overall aesthetic appearance of trucks and SUVs
Cons
- Minor road noise or a low-pitch hum with slight vibration reported by a few users around specific speeds (30-40 mph or highway cruising)
- Potential for isolated quality control issues, such as a difficult-to-balance or defective individual tire
- A slight reduction in fuel economy noted when upgrading to certain larger sizes
Tire B Discoverer Road Trail A/T
Pros
- Exceptionally quiet and smooth ride on pavement
- Confidence-inspiring wet traction and strong resistance to hydroplaning
- Good overall comfort and fuel efficiency for a mild all-terrain tire
Cons
- Slight increase in road noise and diminished dry grip as tread wears toward higher mileage
- Compound can struggle slightly on slicker, chilly asphalt during heavy rain
- Potential for initial rapid wear if tire pressure is set incorrectly
Specs side by side
| Attribute | A · Nitto Terra Grappler G3 | B · Cooper Discoverer Road Trail A/T |
|---|---|---|
| Category | All-Terrain tire | All-Terrain tire |
| Vehicle type | SUV and 4x4 | — |
| Sizes available | 76 | — |
| Rim diameters | 16″ – 22″ | — |
| Tread depth | 12.7/32″ | — |
| UTQG | 600 A B | — |
| Treadwear warranty | 70,000 mi | — |
| Sidewall | Blackwall | — |
| Max pressure | 50 psi | — |
Which one should you actually buy?
77
/ 100
Nitto Terra Grappler G3
75
/ 100
Cooper Discoverer Road Trail A/T
Narrow edge: Nitto Terra Grappler G3 — better dry, treadwear and wet. Pick the Cooper Discoverer Road Trail A/T if snow and comfort matter most to you. Cooper Discoverer Road Trail A/T rests on little evidence so far (1 test, 7 reviews), so read this result as provisional.
Pick tire B
You drive through snowy winters
Cooper Discoverer Road Trail A/T scores 72 vs 52 on snow.
Pick tire A
You want the most grip on dry roads
Nitto Terra Grappler G3 scores 84 vs 74 on dry.
Pick tire A
You want the longest tread life
Nitto Terra Grappler G3 scores 79 vs 70 on treadwear.
Pick tire A
Your priority is wet-weather safety
Nitto Terra Grappler G3 scores 86 vs 81 on wet.
Tire A · Nitto Terra Grappler G3
Tire B · Cooper Discoverer Road Trail A/T
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Terra Grappler G3 or Discoverer Road Trail A/T?
Which is better in the wet, Terra Grappler G3 or Discoverer Road Trail A/T?
Nitto Terra Grappler G3, 86 vs 81 on our wet score.
Which grips better on dry roads, Terra Grappler G3 or Discoverer Road Trail A/T?
Nitto Terra Grappler G3, 84 vs 74 on our dry score.
Which is better in snow, Terra Grappler G3 or Discoverer Road Trail A/T?
Cooper Discoverer Road Trail A/T, 72 vs 52 on our snow score.
Which is quieter, Terra Grappler G3 or Discoverer Road Trail A/T?
Neither, by our numbers: 71 vs 72 on the noise score, within 3 points.
Which is more comfortable, Terra Grappler G3 or Discoverer Road Trail A/T?
Cooper Discoverer Road Trail A/T, 79 vs 76 on our comfort score.
Which lasts longer, Terra Grappler G3 or Discoverer Road Trail A/T?
Nitto Terra Grappler G3, 79 vs 70 on our treadwear score.
How do we compare tires?
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