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 Cooper Discoverer STT PRO — 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
88
/ 100
Objective (60%)
–/100
No test data yet
User signal (40%)
88/100
356 owner reviews
Prices change daily — check the retailer for your size.
VerdictWinner: Cooper Discoverer AT3 XLT — better noise, treadwear and comfort. 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 2
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| Tire Rack owners | 89 | 87 |
| Tyre Reviews owners | 83 | 81 |
| SimpleTire owners | 98 | 94 |
| America's Tire owners | 97 | 96 |
Wet
Score (0–100)
Discoverer AT3 XLT leads by 3
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| Tire Rack owners | 87 | 93 |
| Tyre Reviews owners | 78 | 71 |
| SimpleTire owners | 97 | 91 |
| America's Tire owners | 94 | 91 |
Snow
Score (0–100)
Discoverer AT3 XLT leads by 1
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| Tire Rack owners | 92 | 90 |
| Tyre Reviews owners | 70 | 63 |
| SimpleTire owners | 90 | 91 |
Comfort
Score (0–100)
Discoverer AT3 XLT leads by 5
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| Tire Rack owners | 83 | 81 |
| Tyre Reviews owners | 88 | 66 |
| SimpleTire owners | 96 | 89 |
| America's Tire owners | 93 | 88 |
Noise
Score (0–100)
Discoverer AT3 XLT leads by 15
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| SimpleTire owners | 92 | 79 |
| America's Tire owners | 93 | 78 |
Treadwear
Score (0–100)
Discoverer AT3 XLT leads by 7
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| Tire Rack owners | 87 | 75 |
| Tyre Reviews owners | 78 | 90 |
| SimpleTire owners | 91 | 84 |
| America's Tire owners | 93 | 87 |
Handling
Score (0–100)
Discoverer AT3 XLT leads by 5
Why this score
| Source | Discoverer AT3 XLT | Discoverer STT PRO |
|---|---|---|
| Tyre Reviews owners | 83 | 70 |
| America's Tire owners | 94 | 90 |
Scores at a glance
| Category | Cooper Discoverer AT3 XLT | Cooper Discoverer STT PRO |
|---|---|---|
| Relative Score | 93 | 88 |
| Dry | 97 | 95 |
| Wet | 94 | 91 |
| Snow | 89 | 88 |
| Comfort | 93 | 88 |
| Noise | 93 | 78 |
| Treadwear | 93 | 86 |
| Handling | 94 | 89 |
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
93
/ 100
Tire A
88
/ 100
Tire B
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
Cooper Discoverer STT PRO
We haven't collected enough community discussion about this tire yet.
Specifications
Specs side by side
| Attribute | A · Cooper Discoverer AT3 XLT | B · Cooper Discoverer STT PRO |
|---|---|---|
| Category | Premium Touring All Season tire | All Season All Terrain and Off Road tires |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 3 | 23 |
| Rim diameters | 16″ – 20″ | 16″ – 20″ |
| Tread depth | 16 - 18/32″ | 18 - 22/32″ |
| Treadwear warranty | 60,000 mi | — |
| Sidewall | Black Side Wall - Raised White Lettering | Black Side Wall - Raised White Lettering |
| Max pressure | 35 - 80 psi | 35 - 80 psi |
Final verdict
Which one should you actually buy?
93
/ 100
Cooper
88
/ 100
Cooper
Winner: Cooper Discoverer AT3 XLT — better noise, treadwear and comfort. It leads or ties in every category we score.
Pick tire A
You want a quieter cabin
Cooper Discoverer AT3 XLT scores 93 vs 78 on noise.
Pick tire A
You want the longest tread life
Cooper Discoverer AT3 XLT scores 93 vs 86 on treadwear.
Pick tire A
You want the most comfortable ride
Cooper Discoverer AT3 XLT scores 93 vs 88 on comfort.
Pick tire A
You enjoy sharp, responsive handling
Cooper Discoverer AT3 XLT scores 94 vs 89 on handling.
Tire A · Cooper Discoverer AT3 XLT
Tire B · Cooper Discoverer STT PRO
More comparisons
Also compared with
Cooper Discoverer AT3 XLT also compared with
Cooper Discoverer STT PRO 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.