93
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
94/100
478 owner reviews
Prices change daily — check the retailer for your size.
Head-to-head
Updated September 2026
Cooper Discoverer AT3 XLT vs Dunlop Grandtrek ST30 — Compared (September 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
70
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
67/100
26 owner reviews
Prices change daily — check the retailer for your size.
VerdictWinner: Cooper Discoverer AT3 XLT — better snow, handling and noise. 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 XLT leads by 15
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| Tire Rack owners | 89 | 78 |
| Tyre Reviews owners | 83 | 84 |
| SimpleTire owners | 98 | 72 |
| America's Tire owners | 97 | – |
Wet
Score (0–100)
Discoverer AT3 XLT leads by 23
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| Tire Rack owners | 87 | 77 |
| Tyre Reviews owners | 78 | 71 |
| SimpleTire owners | 97 | 72 |
| America's Tire owners | 94 | – |
Snow
Score (0–100)
Discoverer AT3 XLT leads by 28
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| Tire Rack owners | 92 | 87 |
| Tyre Reviews owners | 70 | 60 |
| SimpleTire owners | 90 | 60 |
Comfort
Score (0–100)
Discoverer AT3 XLT leads by 22
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| Tire Rack owners | 83 | 70 |
| Tyre Reviews owners | 88 | 71 |
| SimpleTire owners | 96 | 72 |
| America's Tire owners | 93 | – |
Noise
Score (0–100)
Discoverer AT3 XLT leads by 25
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| SimpleTire owners | 92 | 68 |
| America's Tire owners | 93 | – |
Treadwear
Score (0–100)
Discoverer AT3 XLT leads by 25
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| Tire Rack owners | 87 | 76 |
| Tyre Reviews owners | 78 | 70 |
| SimpleTire owners | 91 | 60 |
| America's Tire owners | 93 | – |
Handling
Score (0–100)
Discoverer AT3 XLT leads by 26
Why this score
| Source | Discoverer AT3 XLT | Grandtrek ST30 |
|---|---|---|
| Tyre Reviews owners | 83 | 68 |
| America's Tire owners | 94 | – |
Scores at a glance
| Category | Cooper Discoverer AT3 XLT | Dunlop Grandtrek ST30 |
|---|---|---|
| Relative Score | 93 | 70 |
| Dry | 97 | 82 |
| Wet | 94 | 71 |
| Snow | 89 | 61 |
| Comfort | 93 | 71 |
| Noise | 93 | 68 |
| Treadwear | 93 | 68 |
| Handling | 94 | 68 |
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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Recomputed
Headline score
93
/ 100
Tire A
70
/ 100
Tire B
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 ST30 receives highly polarized feedback, often serving as polarizing original equipment on popular SUVs like the Honda CR-V and Toyota RAV4. While some users praise its dry-road stability, longevity, and value, a significant portion of owners report dissatisfaction regarding wet-weather confidence, excessive road noise, and inconsistent tread wear.
Pros
- Strong dry-pavement grip and straight-line stability
- Competitive price point and value for money
- High mileage potential for some drivers
- Capable performance on light unpaved or rural roads
Cons
- Poor wet-weather performance and susceptibility to aquaplaning
- High levels of road noise on various surfaces
- Inconsistent tread life, with reports of rapid wear
- Lack of confidence in winter conditions, including snow and ice
Observations
- Users of AWD vehicles like the Honda CR-V and Toyota RAV4 report highly variable experiences, ranging from excellent longevity to premature wear and poor wet-traction handling.
- The tire is frequently criticized for its lack of winter capability, with many owners noting it is unsuitable for anything beyond light, dry conditions.
Community buzz
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Tire A
Positive
Cooper Discoverer AT3 XLT
Community members express strong satisfaction with the Cooper Discoverer AT3 XLT, highlighting its smooth ride quality, impressive comfort, and quietness compared to competing all-terrain tires like BFG KO2 and Toyo Open Country A/T II. Users also appreciate the solid value when purchased through online retailers during holiday sales, though questions occasionally arise regarding specific winter rating designations.
r/f150
·51 upvotes ·2021-12-30
“New shoes this week, Cooper Discoverer At3 XLT. I’m really impressed so far.”
r/NissanTitan
·29 upvotes ·2023-03-29
“Put some new tires on the XD today. Cooper Discoverer AT3 XLT in 275/70R18. I usually run BFG KO2s on my trucks but wanted to try something different this time.”
r/ram_trucks
·27 upvotes ·2024-07-11
“Cooper Discoverer AT3 XLT Picked up a set of Discoverer AT3 XLT from simple tire. With the 4th of July discounts all 4 were under 1k before taxes. I had the AT3 4S on a previous ram and they held up so I’m expecting good things here.”
r/ram_trucks
·22 upvotes ·2021-11-19
“New Cooper Discoverer AT3 XLT 275/75R20 these ride way better than my old Open Country A/T II”
Top themes
#ride comfort and smoothness#low road noise#comparison to competing tires#value and pricing#winter and snow rating
Based on 7 community posts
Tire B
Dunlop Grandtrek ST30
We haven't collected enough community discussion about this tire yet.
Specifications
Specs side by side
| Attribute | A · Cooper Discoverer AT3 XLT | B · Dunlop Grandtrek ST30 |
|---|---|---|
| Category | Premium Touring All Season tire | All Season Premium Touring tires |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 3 | 2 |
| Rim diameters | 16″ – 20″ | 17″ – 18″ |
| Tread depth | 16 - 18/32″ | 10/32″ |
| UTQG | — | 360 A A |
| Treadwear warranty | 60,000 mi | — |
| Sidewall | Black Side Wall - Raised White Lettering | Blackwall |
| Max pressure | 35 - 80 psi | 51 psi |
Final verdict
Which one should you actually buy?
93
/ 100
Cooper
70
/ 100
Dunlop
Winner: Cooper Discoverer AT3 XLT — better snow, handling and noise. It leads or ties in every category we score.
Pick tire A
You drive through snowy winters
Cooper Discoverer AT3 XLT scores 89 vs 61 on snow.
Pick tire A
You enjoy sharp, responsive handling
Cooper Discoverer AT3 XLT scores 94 vs 68 on handling.
Pick tire A
You want a quieter cabin
Cooper Discoverer AT3 XLT scores 93 vs 68 on noise.
Pick tire A
You want the longest tread life
Cooper Discoverer AT3 XLT scores 93 vs 68 on treadwear.
Tire A · Cooper Discoverer AT3 XLT
Tire B · Dunlop Grandtrek ST30
More comparisons
Also compared with
Cooper Discoverer AT3 XLT also compared with
Dunlop Grandtrek ST30 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.