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Cooper Discoverer STT PRO vs Cooper Discoverer AT3 LT — Compared

Relative Score (0–100): 60% professional tests, 40% owner reviews.

Discoverer AT3 LT is ahead, 74–63

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Tire ACooper

Discoverer STT PRO

All Season

Tests – · none yet Owners 60 · 421 reviews

“Installed the stt pro's on the 10 duramax , so far I really like the tires . Put them to the test backcountry camping (towing 5th wheel) & they were good in the mud & towing. They arent the quietest tires , but did quiet down after some miles. Comparable in noise to the trail grapplers or slightly louder, they weren't squirmy when new, unlike the trailer grapplers I had on my old dodge diesel for the 1st few hundred miles Sent from AutoGuide.com Free App”

Tire BCooper

Discoverer AT3 LT

Premium Touring All Season tire

Tests – · none yet Owners 77 · 251 reviews

“From the Cooper site: Discoverer A/T3 55,000 Mile Treadwear Protection - Light Truck sizes 60,000 Mile Treadwear Protection - SUV sizes The Discoverer A/T3™ is an all-season, all-terrain tire designed to perform well on the highway and off for drivers of SUVs and light duty trucks. Excellent highway performance Excellent wet traction Improved treadwear and traction in rocky and gravel terrain M+S Rated Discoverer AT3 LT 60,000 Mile Treadwear Protection - LT-metric sizes The Discoverer AT3 LT™ with Durable Tread Technology™ hauls heavy loads with less wear and are built to withstand ongoing assault from dirt and gravel. Designed to prevent shredding on rocky and gravel terrain Extreme durability for hauling Superior control and braking in wet weather Cutting through the marketing-speak, it sounds like the A/T3 is more road biased and the AT3 LT is perhaps heavier duty and more offroad biased. And the AT3 LT is not rated for winter conditions. I've had Discount Tire try to feed me a load of BS on more than one occasion. It sounds like that's what they were doing to you. The A/T3 is definitely still available.”

Category by category

Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.

  1. 65

    Dry

    Discoverer AT3 LT +12
    77
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online6383
  2. 67

    Wet

    Discoverer AT3 LT +12
    79
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online6682
  3. 66

    Snow

    Discoverer AT3 LT +5
    71
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online6473
  4. 61

    Comfort

    Discoverer AT3 LT +11
    72
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online5275
  5. 54

    Noise

    Discoverer AT3 LT +17
    71
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online3478
  6. 63

    Treadwear

    Discoverer AT3 LT +8
    71
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online6274
  7. 54

    Handling

    Discoverer AT3 LT +16
    70
    Why this score
    SourceDiscoverer STT PRODiscoverer AT3 LT
    Reviews found online5470
Scores at a glance
CategoryCooper Discoverer STT PROCooper Discoverer AT3 LT
Relative Score 63 74
Dry 65 77
Wet 67 79
Snow 66 71
Comfort 61 72
Noise 54 71
Treadwear 63 71
Handling 54 70

Higher is better. The Relative Score follows your weights below; category scores do not change.

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Headline score

Discoverer STT PRO

Discoverer AT3 LT

Pros, cons & observations

Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.

Tire A Discoverer STT PRO

Pros

  • Outstanding off-road traction in mud, rocks, and dirt
  • Surprisingly low road noise and smooth ride for a mud-terrain tire
  • Aggressive and appealing visual design with tough sidewalls

Cons

  • Can be difficult to balance properly, leading to vibrations for some users
  • Faster tread wear reported by a subset of drivers under heavy use
  • Reduced traction in specific conditions like deep sand or packed snow/ice
All owner themes in the Discoverer STT PRO review

Tire B Discoverer AT3 LT

Pros

  • Excellent towing stability with minimal sidewall flex under heavy loads
  • Surprisingly quiet and smooth on the highway for an all-terrain tire
  • Strong durability and wear resistance on rough gravel, rock, and dirt roads

Cons

  • Subpar performance in heavy snow, ice, or deep mud for some users
  • Occasional reports of balancing difficulties or initial cold-weather tire thumping
  • Isolated incidents of sidewall splitting or premature wear
All owner themes in the Discoverer AT3 LT review

What real owners are saying

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

Tire A

Cooper Discoverer STT PRO

Positive

Community members widely praise the Cooper Discoverer STT PRO for its exceptional off-road traction, towing capability, and dependable handling in mud, rain, and snow. While users note it balances well and rides comfortably for a mud-terrain tire, the most common criticisms involve pavement road noise that increases with wear and concerns regarding tread life on heavy trucks.

powerstroke.org ·2022-04-14

“I have used Cooper Discoverer STT Pro's in mud, rain, snow, ice, sand, etc. They have performed just fine in each. They are a bit louder on the highway, but it's not that noticable. -jokester”
ford-trucks.com

“I had a set in 295/70R18. The first 50% was good all around. However they got really noisy as they wore to the point you couldn't hold a conversation in the cab. At that point they had to go.”
therangerstation.com ·1 upvote ·2019-09-30

“They (Cooper Discover SST Pro's) are louder than an all season for sure but not louder than my Buckshots that I ran years ago. A friend has them on his truck, '08 Ford F250 Super Duty diesel, his only complaint is how loud they were for him since the truck drives on pavement most times except on a construction site. I have driven this truck numerous times and the Cooper SST pro's have great traction both on and off road but seem, IMO, to wear quickly on pavement, for the reasons Jim Oaks mentioned, so He will not get them for his application again.... Wish they made them in my size though. So in short I agree with Jim that these are a good tire especially for its intended application.”
Top themes
#off-road traction#highway road noise#mud and snow performance#tread wear life#heavy truck towing#balancing and ride quality

Based on 38 community posts

Tire B

Cooper Discoverer AT3 LT

Mixed

Community sentiment regarding the Cooper Discoverer AT3 LT is mixed with a positive lean. Drivers appreciate its wet and snow traction, low noise, and strong tread life under heavy loads, though some report irregular wear and persistent balancing or vibration issues after accumulating mileage.

clubfrontier.org ·2 upvotes ·2023-02-26

“I got 80k (rotating every 10k) out of Coopers on my 2010 and have 40k on current 2019 SL ... Discoverer AT3 LT ... they are designed for heavier trucks... excellent noise, excellent in water. I got stuck in a grass field in the factory HT hancocks... same field few years later with coopers.. no issues.. never tried in snow but imagine they would do well...”
hdrams.com ·1 upvote ·2026-01-17

“I ran a set of 295/70r18 Discoverer AT3 LT’s for about 25k miles. I had seen lots of negative reviews but figured that I would be OK with them for my needs ( I drive in snow 4 - 5 times per year). Initially I was happy with the tires as they performed well in the snow and the rain but after 10k miles they developed a balance issue and started to wear irregularly. I had never experienced anything like it before. I actually purchased new shocks but never installed them. As I drive a lot of miles I just never had any time to deal with chasing the vibration / balance issue and just replaced the tires with Bridgestone Dueler AT Ascent. I now have about 20k miles on the Bridgestone’s and they are still ride very smooth and are wearing great.”
wanderthewest.com ·2020-07-08

“I have the Cooper Discoverer AT3 LT tires on my 2010 Tundra with Hawk. They are E series tires. Found this link that discusses the differences between the LT and XLT. Really like my LT's. The increased tire mileage would probably be a good thing of the price difference isn't too great. Paul”
Top themes
#Wet traction performance#Treadwear and longevity#Heavy load handling#Balancing and vibration#Snow traction capability

Based on 5 community posts

Specs side by side

Attribute A · Cooper Discoverer STT PRO B · Cooper Discoverer AT3 LT
CategoryAll SeasonPremium Touring All Season tire
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available2314
Rim diameters16″ – 20″16″ – 18″
Tread depth18 - 22/32″16 - 17/32″
Treadwear warranty—60,000 mi
SidewallBlack Side Wall - Raised White LetteringBlack Side Wall - Raised Outline White Lettering
Max pressure35 - 80 psi50 - 80 psi

Which one should you actually buy?

Cooper Discoverer STT PRO

Cooper Discoverer AT3 LT

Winner: Cooper Discoverer AT3 LT — better noise, handling and dry. It leads or ties in every category we score.

Pick tire B You want a quieter cabin

Cooper Discoverer AT3 LT scores 71 vs 54 on noise.

Pick tire B You enjoy sharp, responsive handling

Cooper Discoverer AT3 LT scores 70 vs 54 on handling.

Pick tire B You want the most grip on dry roads

Cooper Discoverer AT3 LT scores 77 vs 65 on dry.

Pick tire B Your priority is wet-weather safety

Cooper Discoverer AT3 LT scores 79 vs 67 on wet.

Tire A · Cooper Discoverer STT PRO
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Tire B · Cooper Discoverer AT3 LT
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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.

Community buzz from Reddit and forums is shown for context only — it never changes the score.

74

Leads

Discoverer AT3 LT

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