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Head-to-head Updated September 2026

Cooper Discoverer AT3 XLT vs Cooper WeatherMaster ST3 — 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.

Tire A Cooper

Cooper Discoverer AT3 XLT

Premium Touring All Season tire

Cooper Discoverer AT3 XLT tread pattern
Objective (60%)
–/100
No test data yet
User signal (40%)
94/100
478 owner reviews
Dry
97
Wet
94
Snow
89
Comfort
93
Noise
93
Treadwear
93
Handling
94
Check price on Amazon

Prices change daily — check the retailer for your size.

VS
Tire B Cooper

Cooper WeatherMaster ST3

Touring Winter tire

Cooper WeatherMaster ST3 tread pattern
Objective (60%)
–/100
No test data yet
User signal (40%)
62/100
Owner ratings
Dry
78
Wet
55
Snow
60
Comfort
65
Noise
–
Treadwear
70
Handling
75
Check price on Amazon

Prices change daily — check the retailer for your size.

VerdictWinner: Cooper Discoverer AT3 XLT — better wet, snow and comfort. It leads or ties in every category we score.
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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

Weight: Neutral
Score (0–100) Discoverer AT3 XLT leads by 19
A
97
B
78
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
Tire Rack owners 89 –
Tyre Reviews owners 83 –
SimpleTire owners 98 –
America's Tire owners 97 –

Wet

Weight: Important
Score (0–100) Discoverer AT3 XLT leads by 39
A
94
B
55
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
Tire Rack owners 87 –
Tyre Reviews owners 78 –
SimpleTire owners 97 –
America's Tire owners 94 –

Snow

Weight: Neutral
Score (0–100) Discoverer AT3 XLT leads by 29
A
89
B
60
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
Tire Rack owners 92 –
Tyre Reviews owners 70 –
SimpleTire owners 90 –

Comfort

Weight: Neutral
Score (0–100) Discoverer AT3 XLT leads by 28
A
93
B
65
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
Tire Rack owners 83 –
Tyre Reviews owners 88 –
SimpleTire owners 96 –
America's Tire owners 93 –

Noise

Weight: Neutral
Score (0–100)
A
93
B
–
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
SimpleTire owners 92 –
America's Tire owners 93 –

Treadwear

Weight: Important
Score (0–100) Discoverer AT3 XLT leads by 23
A
93
B
70
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
Tire Rack owners 87 –
Tyre Reviews owners 78 –
SimpleTire owners 91 –
America's Tire owners 93 –

Handling

Weight: Neutral
Score (0–100) Discoverer AT3 XLT leads by 19
A
94
B
75
Why this score
SourceDiscoverer AT3 XLTWeatherMaster ST3
Tyre Reviews owners 83 –
America's Tire owners 94 –

Scores at a glance

CategoryCooper Discoverer AT3 XLTCooper WeatherMaster ST3
Relative Score 93 66
Dry 97 78
Wet 94 55
Snow 89 60
Comfort 93 65
Noise 93 –
Treadwear 93 70
Handling 94 75

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
NoneLessNeutralMoreMost
Important
NoneLessNeutralMoreMost
Neutral
NoneLessNeutralMoreMost
Neutral
NoneLessNeutralMoreMost
Neutral
NoneLessNeutralMoreMost
Important
NoneLessNeutralMoreMost
Neutral
NoneLessNeutralMoreMost
Recomputed
Headline score

Tire A

Tire B

Only categories both tires have data for count toward the headline score.

Community buzz

What real owners are saying

From Reddit, forums and review threads. Not part of our score

Tire A

Cooper Discoverer AT3 XLT

Positive

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 WeatherMaster ST3

We haven't collected enough community discussion about this tire yet.

Specifications

Specs side by side

Attribute A · Cooper Discoverer AT3 XLT B · Cooper WeatherMaster ST3
CategoryPremium Touring All Season tireTouring Winter tire
Vehicle typeSUV and 4x4Passenger Car / Crossover
Sizes available3—
Rim diameters16″ – 20″—
Tread depth16 - 18/32″—
Treadwear warranty60,000 mi—
SidewallBlack Side Wall - Raised White Lettering—
Max pressure35 - 80 psi—
Final verdict

Which one should you actually buy?

Cooper

Cooper

Winner: Cooper Discoverer AT3 XLT — better wet, snow and comfort. It leads or ties in every category we score.

Pick tire A Your priority is wet-weather safety

Cooper Discoverer AT3 XLT scores 94 vs 55 on wet.

Pick tire A You drive through snowy winters

Cooper Discoverer AT3 XLT scores 89 vs 60 on snow.

Pick tire A You want the most comfortable ride

Cooper Discoverer AT3 XLT scores 93 vs 65 on comfort.

Pick tire A You want the longest tread life

Cooper Discoverer AT3 XLT scores 93 vs 70 on treadwear.

Tire A · Cooper Discoverer AT3 XLT
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Tire B · Cooper WeatherMaster ST3
Check price on Amazon

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.