94
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
94/100
191 owner reviews
Prices change daily — check the retailer for your size.
Head-to-head
Updated May 2026
Cooper Discoverer AT3 LT vs Dunlop Grandtrek AT20 — Compared (May 2026)
Our Relative Score blends 60% objective test data with 40% owner-review signal — so any two tires can be compared even if they were never tested on the same day.
VS
Tire B
Dunlop
Dunlop Grandtrek AT20
59
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
52/100
35 owner reviews
Prices change daily — check the retailer for your size.
VerdictWinner: Cooper Discoverer AT3 LT — better snow, wet and handling. It leads or ties in every category we score.
Read full
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Category breakdown
7 categories, side by side
Each bar is the Relative Score for that category. Expand a tile to see the test results and owner ratings behind it.
Dry
Score (0–100)
Discoverer AT3 LT leads by 24
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| Tire Rack owners | – | 50 |
| Tyre Reviews owners | 85 | 73 |
| SimpleTire owners | 100 | 89 |
| America's Tire owners | 97 | – |
Wet
Score (0–100)
Discoverer AT3 LT leads by 43
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| Tire Rack owners | – | 50 |
| Tyre Reviews owners | 85 | 52 |
| SimpleTire owners | 95 | 85 |
| America's Tire owners | 94 | – |
Snow
Score (0–100)
Discoverer AT3 LT leads by 67
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| Tire Rack owners | – | 62 |
| Tyre Reviews owners | 90 | 23 |
| SimpleTire owners | 93 | 82 |
Comfort
Score (0–100)
Discoverer AT3 LT leads by 25
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| Tire Rack owners | – | 38 |
| Tyre Reviews owners | 75 | 69 |
| SimpleTire owners | 95 | 87 |
| America's Tire owners | 94 | – |
Noise
Score (0–100)
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| SimpleTire owners | 93 | 83 |
| America's Tire owners | 92 | – |
Treadwear
Score (0–100)
Discoverer AT3 LT leads by 25
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| Tire Rack owners | – | 69 |
| Tyre Reviews owners | 40 | 68 |
| SimpleTire owners | 100 | 83 |
| America's Tire owners | 93 | – |
Handling
Score (0–100)
Discoverer AT3 LT leads by 30
Why this score
| Source | Discoverer AT3 LT | Grandtrek AT20 |
|---|---|---|
| Tyre Reviews owners | 45 | 64 |
| America's Tire owners | 94 | – |
Scores at a glance
| Category | Cooper Discoverer AT3 LT | Dunlop Grandtrek AT20 |
|---|---|---|
| Relative Score | 94 | 59 |
| Dry | 97 | 73 |
| Wet | 95 | 52 |
| Snow | 91 | 24 |
| Comfort | 94 | 69 |
| Noise | 92 | – |
| Treadwear | 93 | 68 |
| Handling | 94 | 64 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
Personalize
Weight the categories that matter to you
Wet grip and treadwear start at “Important” — the two things buyers rank highest. Move the sliders and the scores update instantly.
Neutral
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Neutral
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Neutral
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Recomputed
Headline score
94
/ 100
Tire A
59
/ 100
Tire B
Only categories both tires have data for count toward the headline score.
From owners
Pros, cons & observations
Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.
Not enough owner reviews yet to extract themes.
The Dunlop Grandtrek A/T20 is a polarizing tire that is frequently criticized for its poor wet-weather performance and limited off-road capability, despite being a common original equipment choice for various 4x4s. While a significant portion of users report exceptional tread longevity and acceptable dry-road comfort, many owners find the lack of confidence in rain and snow to be a safety concern that outweighs the tire's durability.
Pros
- Exceptional tread life and high mileage durability
- Quiet and comfortable ride on paved surfaces
- Reliable performance in dry, warm weather conditions
- Consistent availability as a factory-fitted original equipment tire
Cons
- Dangerous handling and poor traction on wet roads
- Inadequate performance in snow, ice, and mud
- Susceptibility to shoulder wear and uneven tread degradation
- Limited off-road durability and puncture resistance
Observations
- Owners of heavy 4x4s like the Toyota Land Cruiser and Mitsubishi Shogun frequently report that the tire's performance does not match the vehicle's off-road capabilities.
- Some users noted that adjusting tire pressure slightly above factory recommendations can help mitigate uneven shoulder wear, though this remains a recurring complaint across various models.
Specifications
Specs side by side
| Attribute | A · Cooper Discoverer AT3 LT | B · Dunlop Grandtrek AT20 |
|---|---|---|
| Category | Premium Touring All Season tire | — |
| Vehicle type | SUV and 4x4 | — |
| Sizes available | 9 | 2 |
| Rim diameters | 16″ – 18″ | 17″ – 18″ |
| Tread depth | 16 - 17/32″ | — |
| Treadwear warranty | 60,000 mi | — |
| Sidewall | Black Side Wall - Raised Outline White Lettering | Blackwall |
| Max pressure | 50 - 80 psi | — |
Final verdict
Which one should you actually buy?
94
/ 100
Cooper
59
/ 100
Dunlop
Winner: Cooper Discoverer AT3 LT — better snow, wet and handling. It leads or ties in every category we score.
Pick tire A
You drive through snowy winters
Cooper Discoverer AT3 LT scores 91 vs 24 on snow.
Pick tire A
Your priority is wet-weather safety
Cooper Discoverer AT3 LT scores 95 vs 52 on wet.
Pick tire A
You enjoy sharp, responsive handling
Cooper Discoverer AT3 LT scores 94 vs 64 on handling.
Pick tire A
You want the most comfortable ride
Cooper Discoverer AT3 LT scores 94 vs 69 on comfort.
Tire A · Cooper Discoverer AT3 LT
Tire B · Dunlop Grandtrek AT20
More comparisons
Also compared with
Cooper Discoverer AT3 LT also compared with
Dunlop Grandtrek AT20 also compared with
How do we compare tires?
Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements) normalized against the best tire in each test and weighted toward recent tests. 40% comes from thousands of owner reviews collected from retailers and review sites. When a tire has only one of the two, we use what exists and say so.
Community buzz from Reddit and forums is shown for context only — it never changes the score.