Head-to-head Updated

Cooper Discoverer AT3 XLT vs Cooper Discoverer STT PRO — Compared

Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 0 + 0 road tests and 800 + 422 owner reviews. How we score

Discoverer AT3 XLT is ahead, 78–63

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Cooper Discoverer AT3 XLT
Tire ACooper

Discoverer AT3 XLT

All-Terrain tire

± 7

Tests – · none yet Owners 82 · 800 reviews

“New shoes this week, Cooper Discoverer At3 XLT. I’m really impressed so far.”

Category by category

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

  1. 79

    Dry

    Discoverer AT3 XLT +15
    64
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Professional tests (TWG score)≈ 75 (est.)≈ 66 (est.)
    Reviews found online8563

    Discoverer AT3 XLT: 60% × 75.1 (est.) + 40% × 85.3 = 79

    Discoverer STT PRO: 60% × 65.7 (est.) + 40% × 62.5 = 64

    No road tests of dry for Discoverer AT3 XLT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

    No road tests of dry for Discoverer STT PRO. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 83

    Wet

    Discoverer AT3 XLT +15
    68
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Professional tests (TWG score)≈ 80 (est.)≈ 68 (est.)
    Reviews found online8767

    Discoverer AT3 XLT: 60% × 79.7 (est.) + 40% × 87.2 = 83

    Discoverer STT PRO: 60% × 68.5 (est.) + 40% × 66.6 = 68

    No road tests of wet for Discoverer AT3 XLT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

    No road tests of wet for Discoverer STT PRO. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 71

    Snow

    Discoverer AT3 XLT +4
    67
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Professional tests (TWG score)≈ 71 (est.)≈ 69 (est.)
    Reviews found online7265

    Discoverer AT3 XLT: 60% × 70.9 (est.) + 40% × 71.7 = 71

    Discoverer STT PRO: 60% × 68.6 (est.) + 40% × 64.5 = 67

    No road tests of snow for Discoverer AT3 XLT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

    No road tests of snow for Discoverer STT PRO. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

  4. 77

    Comfort

    Discoverer AT3 XLT +23
    54
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Professional tests (TWG score)≈ 71 (est.)≈ 64 (est.)
    Reviews found online8048

    Discoverer AT3 XLT: 40% × 71 (est.) + 60% × 80.3 = 77

    Discoverer STT PRO: 40% × 64.4 (est.) + 60% × 47.6 = 54

    No road tests of comfort for Discoverer AT3 XLT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

    No road tests of comfort for Discoverer STT PRO. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  5. 73

    Noise

    Discoverer AT3 XLT +20
    53
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Professional tests (TWG score)≈ 66 (est.)≈ 66 (est.)
    Reviews found online8232

    Discoverer AT3 XLT: 60% × 66.4 (est.) + 40% × 82.4 = 73

    Discoverer STT PRO: 60% × 66.4 (est.) + 40% × 32 = 53

    No road tests of noise for Discoverer AT3 XLT or Discoverer STT PRO. The test half is the tested tires’ average (66): owners’ noise ratings barely follow the road tests.

  6. 74

    Treadwear

    Discoverer AT3 XLT +12
    62
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Professional tests (TWG score)≈ 71 (est.)≈ 64 (est.)
    Reviews found online7960

    Discoverer AT3 XLT: 60% × 71.2 (est.) + 40% × 79.4 = 74

    Discoverer STT PRO: 60% × 64.1 (est.) + 40% × 59.7 = 62

    No road tests of treadwear for Discoverer AT3 XLT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

    No road tests of treadwear for Discoverer STT PRO. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

  7. 78

    Handling (owners)

    Discoverer AT3 XLT +26
    52
    Why this score
    SourceDiscoverer AT3 XLTDiscoverer STT PRO
    Reviews found online7852
Scores at a glance
Cooper Discoverer AT3 XLT vs Cooper Discoverer STT PRO: scores by category (0–100)
CategoryCooper Discoverer AT3 XLTCooper Discoverer STT PRO
Relative Score 78 63
Dry 79 64
Wet 83 68
Snow 71 67
Comfort 77 54
Noise 73 53
Treadwear 74 62
Handling (owners) 78 52

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

Weight the categories that matter to you

Wet grip starts at “Important”. Treadwear starts at “Neutral” here: road tests measured it for at most one of the two tires, so it rests on owner reviews. Move the sliders and the scores update instantly.

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Neutral
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Neutral
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Recomputed
Headline score
± 7

Discoverer AT3 XLT

± 7

Discoverer STT PRO

Pros, cons & observations

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

Tire A Discoverer AT3 XLT

Pros

  • Significantly lower road noise than comparable aggressive all-terrain tires
  • Excellent wet weather, snow, and slush traction
  • Sturdy sidewalls and stable performance when towing heavy loads

Cons

  • Some users report difficulty with balancing, leading to vibrations or a rough ride
  • Tread life occasionally falls short of expectations for certain drivers
  • Can struggle or get gummed up in deep mud
All owner themes in the Discoverer AT3 XLT review

Tire B 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

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 report high satisfaction with the Cooper Discoverer AT3 XLT, highlighting its quiet ride, long tread life, and strong winter performance. Several owners praise its smooth ride quality and durability under towing conditions compared to rival all-terrain tires. Discussion also commonly centers around sizing, fitment, and snow ratings.

clubfrontier.org ·2 upvotes ·2023-02-23

“COOPER DISCOVERER AT3 XLT / NO STUD / 32.56" / 54 LBS / 3 PEAK / $265.99 This is what I came here to suggest ^ BFG also has the KO3s coming out soon right? Pictures KO3s release for Spring 2023 Patagonia Milestars are also pretty great tires I hear, but I've never had them. They are a subsidiary company of Nankang, made in Taiwan.”

f150forum.com

“Quote: Originally Posted by Stadt This was while I was running a ReadyLift 2.25" level only. The ride was good with only the level, just normal body roll and bed hop. Upgrading to the Bilstein 6112 and 5160 made the truck handle much better. You can gain this same set up with Bilsteins as well. The 285/65R20 did not rub unless the suspension was flexed, but under normal driving conditions, no issues. This tire size is perfect for a 2" level while running the stock wheels. Aftermarket wheels will require a smaller size, 275/65R20 is typically largest before significant rubbing. Thanks for the reply. I actually read through your entire build thread last night. Wow. Awesome stuff there. I’m planning on keeping the OEM Platinum trim 20” wheels. So I could run the Discoverer AT3 XLT 275/65 R20 without any rub at all with either a 2” spacer level or something like this kit from Fox? I don’t want to trim anything and don’t want any rub even when suspension is flexed. It seems like most info online indicates a 33” tire is the max for a 2” level and no rubbing. I believe the 275/65 R20 is a 34” tire. Thanks for the advice!”

r/overlanding ·2 upvotes ·2026-09-28

“Cooper adventurer (pep boys exclusive version of the discoverer), and then Cooper discoverer at3 xlt have been the tires on my tundra for the last +10yrs. I have put 80-100k on each set. I tow a smaller camp trailer regularly. They discontinued that tire, so I'm going to try the stronghold AT next.”

Top themes
#low road noise#tread longevity and wear#snow and winter traction#tire sizing and fitment#ride quality and comfort#towing performance

Based on 13 community posts

Tire B

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.

r/FJCruiser ·2 upvotes ·2026-03-21

“I thought I'd throw my two cents in! I put 5 Cooper Discoverer STT Pro tires on my 2015 Nissan Xterra Pro-4 X in 2021. It cannot be overstated - I LOVE these tires! They're great in dry conditions, they're great in the rain, they're great in the snow, they're great on ice - they even drove over a frozen iceberg in my driveway during a winter emergency as though it wasn't even there. There's a little bit of road noise, but nothing terrible. You can definitely "feel" them when you're driving - but I kind of like that. My truck sits outside during all kinds of Ohio weather, and they don't appear to be cracking/dry rotting quite yet. It will technically be "due" for me to get a new set of tires next year. Without a doubt, I'm getting another set of these!! Happy trails, all!”

ford-trucks.com

“I run a set of Nankang Mudstar tires on my 94 F350, also overseas cheap MTs. For the price, they are about what you'd expect. Very loud, very rough riding, wear fairly quickly. But they were like $600 shipped to my door for a set of 315/75R16, E load range. On my 89 F350 that I drive more often and pull trailers with, I have a set of Cooper Discoverer STT Pros. Night and day difference, but I can buy 2 sets of Nankangs for the cost of 1 set of Coopers. I don't know that I'd risk cheaper tires on my daily driver though. That being said, I do like the look of those Crosswinds.”

subaruoutback.org ·2023-09-21

“I have never been let down by Cooper Discoverer STT PRO or BFGoodrich KO2 off road tires. I love the traction the Cooper STT PRO give me off-roading in the desert. I drove on KO2 from the 2018 until I got my STT PRO. I had Firestone’s as original equipment on a couple different vehicles and never had so many flats (on road or off road).”

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

Specs side by side

Attribute A · Cooper Discoverer AT3 XLT B · Cooper Discoverer STT PRO
CategoryAll-Terrain tireMud-Terrain tire
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available423
Rim diameters16″ – 20″16″ – 20″
Tread depth16 - 18/32″18 - 22/32″
Treadwear warranty60,000 mi—
SidewallBlack Side Wall - Raised White LetteringBlack Side Wall - Raised White Lettering
Max pressure35 - 80 psi35 - 80 psi
Sizes in common33

Which one should you actually buy?

Cooper Discoverer AT3 XLT

Cooper Discoverer STT PRO

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

Pick tire A You enjoy sharp, responsive handling

Cooper Discoverer AT3 XLT scores 78 vs 52 on handling.

Pick tire A You want the most comfortable ride

Cooper Discoverer AT3 XLT scores 77 vs 54 on comfort.

Pick tire A You want a quieter cabin

Cooper Discoverer AT3 XLT scores 73 vs 53 on noise.

Pick tire A You want the most grip on dry roads

Cooper Discoverer AT3 XLT scores 79 vs 64 on dry.

Tire A · Cooper Discoverer AT3 XLT
Tire B · Cooper Discoverer STT PRO

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Discoverer AT3 XLT or Discoverer STT PRO?

Which is better in the wet, Discoverer AT3 XLT or Discoverer STT PRO?

Cooper Discoverer AT3 XLT, 83 vs 68 on our wet score.

Which grips better on dry roads, Discoverer AT3 XLT or Discoverer STT PRO?

Cooper Discoverer AT3 XLT, 79 vs 64 on our dry score.

Which is better in snow, Discoverer AT3 XLT or Discoverer STT PRO?

Cooper Discoverer AT3 XLT, 71 vs 67 on our snow score.

Which is quieter, Discoverer AT3 XLT or Discoverer STT PRO?

Cooper Discoverer AT3 XLT, 73 vs 53 on our noise score.

Which is more comfortable, Discoverer AT3 XLT or Discoverer STT PRO?

Cooper Discoverer AT3 XLT, 77 vs 54 on our comfort score.

Which lasts longer, Discoverer AT3 XLT or Discoverer STT PRO?

Cooper Discoverer AT3 XLT, 74 vs 62 on our treadwear score.

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.

Handling is the exception: road tests measure it inside the dry and wet scores, so its own row comes from owner ratings only and starts as less important.

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