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Toyo Open Country A/T II vs Cooper Discoverer A/T3 — Compared

Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews. Based on 0 + 0 road tests and 2 + 973 owner reviews. How we score

Check price on Amazon · Open Country A/T II Check price on Amazon · Discoverer A/T3
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Cooper Discoverer A/T3
Tire BCooper

Discoverer A/T3

All-Terrain tire

Tests – · none yet Owners 67 · 973 reviews

“I have a set of 275/60R20 on my dodge work truck. Coming up on 35k. Oilfield roads. These tires are ride smooth and are quiet. They have done well in the snow and mud for me. I will purchase a set of these for my own personal truck once needed. These are great tires.”

Category by category

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

  1. –

    Dry

    No comparison
    71
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Professional tests (TWG score)–≈ 70 (est.)
    Reviews found online–73

    Discoverer A/T3: 60% × 69.9 (est.) + 40% × 73.1 = 71

    No road tests of dry for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.40).

  2. –

    Wet

    No comparison
    73
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Professional tests (TWG score)–≈ 72 (est.)
    Reviews found online–74

    Discoverer A/T3: 60% × 72.3 (est.) + 40% × 74.3 = 73

    No road tests of wet for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.56).

  3. –

    Snow

    No comparison
    68
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Professional tests (TWG score)–≈ 69 (est.)
    Reviews found online–66

    Discoverer A/T3: 60% × 68.6 (est.) + 40% × 66.1 = 68

    No road tests of snow for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.33).

  4. –

    Comfort

    No comparison
    69
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Professional tests (TWG score)–≈ 69 (est.)
    Reviews found online–68

    Discoverer A/T3: 60% × 68.9 (est.) + 40% × 68 = 69

    No road tests of comfort for Discoverer A/T3. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.

  5. –

    Noise

    No comparison
    67
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Professional tests (TWG score)–≈ 67 (est.)
    Reviews found online–66

    Discoverer A/T3: 60% × 67.3 (est.) + 40% × 65.8 = 67

    No road tests of noise for Discoverer A/T3. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.

  6. –

    Treadwear

    No comparison
    59
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Professional tests (TWG score)–≈ 62 (est.)
    Reviews found online–54

    Discoverer A/T3: 60% × 62 (est.) + 40% × 53.7 = 59

    No road tests of treadwear for Discoverer A/T3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.31).

  7. –

    Handling (owners)

    No comparison
    65
    Why this score
    SourceOpen Country A/T IIDiscoverer A/T3
    Reviews found online–65
Scores at a glance
CategoryToyo Open Country A/T IICooper Discoverer A/T3
Relative Score – 69
Dry – 71
Wet – 73
Snow – 68
Comfort – 69
Noise – 67
Treadwear – 59
Handling (owners) – 65

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.

Important
NotLessNeutralImportantMost
Important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Recomputed
Headline score

Open Country A/T II

Discoverer A/T3

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

Pros, cons & observations

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

Tire A Open Country A/T II

Not enough owner reviews yet to extract themes.

Tire B Discoverer A/T3

Pros

  • Exceptionally quiet and smooth highway ride for an all-terrain tire
  • Great traction and handling on dry and wet pavement
  • Strong value and competitive pricing compared to major brand competitors

Cons

  • Some users experienced balancing issues and persistent road vibrations
  • Faster-than-expected tread wear or premature wear reported by a subset of drivers
  • Subpar performance on ice and hard-packed snow for certain vehicle applications
All owner themes in the Discoverer A/T3 review

What real owners are saying

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

Tire A

Toyo Open Country A/T II

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

Tire B

Cooper Discoverer A/T3

Positive

Community sentiment for the Cooper Discoverer A/T3 is overwhelmingly positive, with users frequently praising its low road noise, smooth ride, and strong snow and wet traction. Owners appreciate its long tread life, solid towing capability, and reasonable value, though some note it packs up quickly in thick mud and can become slightly louder as it wears.

f150forum.com

“Put a set on a day after I purchased my truck. Have about 8500 miles on them and no complaints whatsoever. Been on a 3000 trip with them not towing and a 2400 mile trip towing a 8K travel trailer. No problems on either trip. I'll get another set when these wear out, hopefully many miles down the road. No sign of wear yet!”
bobistheoilguy.com ·2012-09-08

“I have a set of 275/60R20 on my dodge work truck. Coming up on 35k. Oilfield roads. These tires are ride smooth and are quiet. They have done well in the snow and mud for me. I will purchase a set of these for my own personal truck once needed. These are great tires.”
ford-trucks.com

“Been running them on the wifes truck for 3 or 4 years now. They are a good tire, very little noise on pavement, does fine on snow. Cooper Discoverer A/T3 Review”
Top themes
#low road noise#snow and wet traction#treadwear and longevity#ride comfort and quality#mud performance limitations#towing and hauling capability#value and pricing

Based on 24 community posts

Specs side by side

Attribute A · Toyo Open Country A/T II B · Cooper Discoverer A/T3
CategoryAll-Terrain tireAll-Terrain tire
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available—14
Rim diameters—15″ – 22″
Tread depth13 - 17/32″14 - 17/32″
UTQG600 A B560 A B
SidewallBlack Side Wall - Raised Outline White LetteringBlack Side Wall - Raised Outline White Lettering
Max pressure44 - 80 psi44 - 80 psi

Which one should you actually buy?

Toyo Open Country A/T II

Cooper Discoverer A/T3

Only Cooper Discoverer A/T3 has enough test and review data for a Relative Score, so there is no head-to-head winner yet.

Tire A · Toyo Open Country A/T II
Check price on Amazon
Tire B · Cooper Discoverer A/T3
Check price on Amazon

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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.

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