Tests – · 1 test Owners 84 · 688 reviews
Best test result: #5 of 18 in 2022 Consumer Reports All Terrain Truck Tires (tested tread life (miles))
“Got some 225/75/16 Cooper Discoverer AT3 4s - Great fit on stock setup.”
Head-to-head
Updated
Cooper Discoverer AT3 4S vs Nitto Terra Grappler G3 — 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 688 + 32 owner reviews. How we score
Discoverer AT3 4S leads, 79–77 Narrow edge
Add your size for an exact match
/R
Both Amazon links then search this exact size.
TireWheelGuide may earn a commission from purchases made through these links.
Tests 74 · 1 test Owners 83 · 32 reviews
Best test result: #1 of 12 in 2024 Tire Rack All Terrain Tyres On-Road Test (wet braking)
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
-
81
Dry
Terra Grappler G3 +384Why this score
Source Discoverer AT3 4S Terra Grappler G3 Professional tests (TWG score) · – / 1 tests ≈ 77 (est.) 86 Reviews found online 88 81 Discoverer AT3 4S: 60% × 76.5 (est.) + 40% × 88.4 = 81
Terra Grappler G3: 60% × 86.2 + 40% × 81.2 = 84
No road tests of dry for Discoverer AT3 4S. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
-
85
Wet
Terra Grappler G3 +186Why this score
Source Discoverer AT3 4S Terra Grappler G3 Professional tests (TWG score) · – / 1 tests ≈ 82 (est.) 87 Reviews found online 91 84 Discoverer AT3 4S: 60% × 81.5 (est.) + 40% × 90.5 = 85
Terra Grappler G3: 60% × 87.1 + 40% × 83.5 = 86
No road tests of wet for Discoverer AT3 4S. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.54).
-
73
Snow
Discoverer AT3 4S +2152Why this score
Source Discoverer AT3 4S Terra Grappler G3 Professional tests (TWG score) · – / 1 tests ≈ 72 (est.) 33 Reviews found online 74 80 Discoverer AT3 4S: 60% × 71.6 (est.) + 40% × 74.3 = 73
Terra Grappler G3: 60% × 32.8 + 40% × 80.2 = 52
No road tests of snow for Discoverer AT3 4S. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).
-
80
Comfort
Discoverer AT3 4S +476Why this score
Source Discoverer AT3 4S Terra Grappler G3 Professional tests (TWG score) · – / 1 tests ≈ 72 (est.) 71 Reviews found online 86 80 Discoverer AT3 4S: 40% × 72 (est.) + 60% × 85.5 = 80
Terra Grappler G3: 40% × 70.8 + 60% × 79.5 = 76
No road tests of comfort for Discoverer AT3 4S. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
-
73
Noise
Discoverer AT3 4S +271Why this score
Source Discoverer AT3 4S Terra Grappler G3 Professional tests (TWG score) · – / 1 tests ≈ 67 (est.) 66 Reviews found online 83 78 Discoverer AT3 4S: 60% × 66.5 (est.) + 40% × 83.1 = 73
Terra Grappler G3: 60% × 66.2 + 40% × 78.4 = 71
No road tests of noise for Discoverer AT3 4S. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
-
75
Treadwear
Terra Grappler G3 +479Why this score
Source Discoverer AT3 4S Terra Grappler G3 Professional tests (TWG score) · 1 / – tests 71 ≈ 74 (est.) Reviews found online 80 87 Discoverer AT3 4S: 60% × 71.1 + 40% × 79.9 = 75
Terra Grappler G3: 60% × 73.7 (est.) + 40% × 87 = 79
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 0.35).
-
80
Handling (owners)
No comparison–Why this score
Source Discoverer AT3 4S Terra Grappler G3 Reviews found online 80 –
Scores at a glance
| Category | Cooper Discoverer AT3 4S | Nitto Terra Grappler G3 |
|---|---|---|
| Relative Score | 79 | 77 |
| Dry | 81 | 84 |
| Wet | 85 | 86 |
| Snow | 73 | 52 |
| Comfort | 80 | 76 |
| Noise | 73 | 71 |
| Treadwear | 75 | 79 |
| Handling (owners) | 80 | – |
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
79
/ 100
Discoverer AT3 4S
77
/ 100
Terra Grappler G3
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.
| Discipline | Category | Discoverer AT3 4S | Terra Grappler G3 | Δ | Head-to-head |
|---|---|---|---|---|---|
| Also published by the testers (not in the score) | |||||
| Overall Ranking | Overall | #5/18 2022 Consumer Reports All Terrain Truck Tires | #27/30 2026 Tire Rack All Terrain Tyre Snow Test | – | Different tests |
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Discoverer AT3 4S
Pros
- Exceptionally quiet and smooth on-road ride compared to typical all-terrain tires
- Superb traction in wet, rainy, and deep winter snow conditions
- Strong value and competitive pricing relative to performance and lifespan
Cons
- Potential for accelerated tread wear under heavy off-road use or demanding mountain driving
- Occasional reports of balancing issues or out-of-round tires requiring multiple adjustments
- Minor fuel economy drop or increased rolling resistance when switching from standard highway tires
Tire B 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
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Tire A
Positive
Cooper Discoverer AT3 4S
Community sentiment for the Cooper Discoverer AT3 4S is predominantly positive, with drivers praising its quiet highway ride, strong traction across snow, rain, and dry pavement, and appealing appearance. Several owners note that while it handles light off-road duties and daily driving well, tread life occasionally falls short of mileage expectations. In addition, multiple posts highlight frustration and concern regarding availability and recent discontinuation across various sizes.
r/f150
·23 upvotes ·2022-09-03
“New tire day. Cooper Discoverer AT3 4S. So far so good. They ride great and they’re really quiet.”
r/subaru
·130 upvotes ·2019-04-20
“New tires 👌 cooper discoverer at3 4s 215/70/16”
r/SubaruForester
·4 upvotes ·2022-12-02
“Cooper Discoverer AT3 4S discontinued, good alternative? I was hoping to replace my stock tires with the Discoverer AT3 tires since I hear really good things about them and they are a bit more aggressive. Seems like they are discontinued at all the normal tire shops online. So what are my alternatives for an AT style tire? Looking for 235/60R17 to put on Drag DR-31 rims. I live in CO so snow and some light off roading are things to consider. Read more”
Top themes
#Snow and wet traction#Quiet highway ride#Tread life and longevity#Discontinuation and availability#Comfortable ride quality#Mild off-road performance
Based on 27 community posts
Tire B
Nitto Terra Grappler G3
We haven't collected enough community discussion about this tire yet.
Specs side by side
| Attribute | A · Cooper Discoverer AT3 4S | B · Nitto Terra Grappler G3 |
|---|---|---|
| Category | All-Terrain tire | All-Terrain tire |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 14 | 75 |
| Rim diameters | 15″ – 22″ | 16″ – 22″ |
| Tread depth | 12 - 14/32″ | 12.7/32″ |
| UTQG | 620 A B | 600 A B |
| Treadwear warranty | 65,000 mi | 70,000 mi |
| Sidewall | Black Side Wall - Raised Outline White Lettering | Blackwall |
| Max pressure | 44 - 50 psi | 50 psi |
| Sizes in common | 10 | 10 |
Which one should you actually buy?
79
/ 100
Cooper Discoverer AT3 4S
77
/ 100
Nitto Terra Grappler G3
Narrow edge: Cooper Discoverer AT3 4S — better snow and comfort. Pick the Nitto Terra Grappler G3 if treadwear and dry matter most to you.
Pick tire A
You drive through snowy winters
Cooper Discoverer AT3 4S scores 73 vs 52 on snow.
Pick tire A
You want the most comfortable ride
Cooper Discoverer AT3 4S scores 80 vs 76 on comfort.
Pick tire B
You want the longest tread life
Nitto Terra Grappler G3 scores 79 vs 75 on treadwear.
Pick tire B
You want the most grip on dry roads
Nitto Terra Grappler G3 scores 84 vs 81 on dry.
Tire A · Cooper Discoverer AT3 4S
Tire B · Nitto Terra Grappler G3
TireWheelGuide may earn a commission from purchases made through these links.
Discoverer AT3 4S or Terra Grappler G3?
Which is better in the wet, Discoverer AT3 4S or Terra Grappler G3?
Neither, by our numbers: 85 vs 86 on the wet score, within 3 points.
Which grips better on dry roads, Discoverer AT3 4S or Terra Grappler G3?
Nitto Terra Grappler G3, 84 vs 81 on our dry score.
Which is better in snow, Discoverer AT3 4S or Terra Grappler G3?
Cooper Discoverer AT3 4S, 73 vs 52 on our snow score.
Which is quieter, Discoverer AT3 4S or Terra Grappler G3?
Neither, by our numbers: 73 vs 71 on the noise score, within 3 points.
Which is more comfortable, Discoverer AT3 4S or Terra Grappler G3?
Cooper Discoverer AT3 4S, 80 vs 76 on our comfort score.
Which lasts longer, Discoverer AT3 4S or Terra Grappler G3?
Nitto Terra Grappler G3, 79 vs 75 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