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Cooper Discoverer AT3 LT vs Toyo Open Country A20 — Compared

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

Check price on Amazon · Discoverer AT3 LT Check price on Amazon · Open Country A20
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Category by category

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

  1. 79

    Dry

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online84–
  2. 78

    Wet

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online81–
  3. 72

    Snow

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online73–
  4. 72

    Comfort

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online75–
  5. 72

    Noise

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online79–
  6. 71

    Treadwear

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online75–
  7. 71

    Handling

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 LTOpen Country A20
    Reviews found online71–
Scores at a glance
CategoryCooper Discoverer AT3 LTToyo Open Country A20
Relative Score 74 –
Dry 79 –
Wet 78 –
Snow 72 –
Comfort 72 –
Noise 72 –
Treadwear 71 –
Handling 71 –

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

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.

Important
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Important
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Neutral
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Less important
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Important
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Neutral
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Recomputed
Headline score

Discoverer AT3 LT

Open Country A20

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 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

Tire B Open Country A20

Not enough owner reviews yet to extract themes.

Specs side by side

Attribute A · Cooper Discoverer AT3 LT B · Toyo Open Country A20
CategoryPremium Touring All Season tire—
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available91
Rim diameters16″ – 18″17″
Tread depth16 - 17/32″10 - 11/32″
UTQG—300 A A
Treadwear warranty60,000 mi—
SidewallBlack Side Wall - Raised Outline White LetteringBlack Side Wall
Max pressure50 - 80 psi44 psi

Which one should you actually buy?

Cooper Discoverer AT3 LT

Toyo Open Country A20

Only Cooper Discoverer AT3 LT has enough test and review data for a Relative Score, so there is no head-to-head winner yet.

Tire A · Cooper Discoverer AT3 LT
Check price on Amazon
Tire B · Toyo Open Country A20
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.

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