tirewheelguide
Head-to-head Updated

Cooper Discoverer STT PRO vs Toyo Open Country M/T — 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 422 + 241 owner reviews. How we score

Open Country M/T is ahead, 68–63

Check price on Amazon · Open Country M/T or Discoverer STT PRO on Amazon
Add your size for an exact match
/R

Both Amazon links then search this exact size.

TireWheelGuide may earn a commission from purchases made through these links.

Toyo Open Country M/T
Tire BToyo

Open Country M/T

Mud-Terrain tire

± 7

Tests – · none yet Owners 67 · 241 reviews

Category by category

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

  1. 64

    Dry

    Open Country M/T +4
    68
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Professional tests (TWG score)≈ 66 (est.)≈ 68 (est.)
    Reviews found online6369

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

    Open Country M/T: 60% × 68.2 (est.) + 40% × 68.5 = 68

    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).

    No road tests of dry for Open Country M/T. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 68

    Wet

    Open Country M/T +4
    72
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Professional tests (TWG score)≈ 68 (est.)≈ 71 (est.)
    Reviews found online6772

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

    Open Country M/T: 60% × 71.3 (est.) + 40% × 71.8 = 72

    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).

    No road tests of wet for Open Country M/T. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 67

    Snow

    Open Country M/T +1
    68
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Professional tests (TWG score)≈ 69 (est.)≈ 69 (est.)
    Reviews found online6567

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

    Open Country M/T: 60% × 69.4 (est.) + 40% × 67.1 = 68

    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).

    No road tests of snow for Open Country M/T. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

  4. 54

    Comfort

    Open Country M/T +8
    62
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Professional tests (TWG score)≈ 64 (est.)≈ 67 (est.)
    Reviews found online4858

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

    Open Country M/T: 40% × 66.6 (est.) + 60% × 58.2 = 62

    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).

    No road tests of comfort for Open Country M/T. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  5. 53

    Noise

    Open Country M/T +11
    64
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Professional tests (TWG score)≈ 66 (est.)≈ 66 (est.)
    Reviews found online3260

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

    Open Country M/T: 60% × 66.4 (est.) + 40% × 59.6 = 64

    No road tests of noise for Discoverer STT PRO or Open Country M/T. The test half is the tested tires’ average (66): owners’ noise ratings barely follow the road tests.

  6. 62

    Treadwear

    Open Country M/T +3
    65
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Professional tests (TWG score)≈ 64 (est.)≈ 66 (est.)
    Reviews found online6064

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

    Open Country M/T: 60% × 65.7 (est.) + 40% × 64.3 = 65

    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).

    No road tests of treadwear for Open Country M/T. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

  7. 52

    Handling (owners)

    Open Country M/T +11
    63
    Why this score
    SourceDiscoverer STT PROOpen Country M/T
    Reviews found online5263
Scores at a glance
CategoryCooper Discoverer STT PROToyo Open Country M/T
Relative Score 63 68
Dry 64 68
Wet 68 72
Snow 67 68
Comfort 54 62
Noise 53 64
Treadwear 62 65
Handling (owners) 52 63

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
± 7

Discoverer STT PRO

± 7

Open Country M/T

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 Open Country M/T

Pros

  • Exceptional off-road traction in mud, sand, gravel, and snow
  • Surprisingly low road noise and smooth ride quality for a mud-terrain tire
  • Rugged, durable sidewalls with high puncture resistance

Cons

  • High initial purchase price
  • Negative impact on vehicle fuel economy (MPG)
  • Reduced grip or slight slickness on wet pavement or icy roads
All owner themes in the Open Country M/T 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.

duramaxforum.com ·2015-09-14

“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”
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”
r/XTerra ·99 upvotes ·2023-03-31

“New shoes. Cooper Discoverer STT Pro. 285/75/16”
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

Toyo Open Country M/T

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

Specs side by side

Attribute A · Cooper Discoverer STT PRO B · Toyo Open Country M/T
CategoryMud-Terrain tireMud-Terrain tire
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available2335
Rim diameters16″ – 20″16″ – 24″
Tread depth18 - 22/32″18 - 22/32″
SidewallBlack Side Wall - Raised White LetteringBlack Side Wall
Max pressure35 - 80 psi35 - 80 psi
Sizes in common1919

Which one should you actually buy?

Cooper Discoverer STT PRO

Toyo Open Country M/T

Winner: Toyo Open Country M/T — better noise, handling and comfort. It leads or ties in every category we score.

Pick tire B You want a quieter cabin

Toyo Open Country M/T scores 64 vs 53 on noise.

Pick tire B You enjoy sharp, responsive handling

Toyo Open Country M/T scores 63 vs 52 on handling.

Pick tire B You want the most comfortable ride

Toyo Open Country M/T scores 62 vs 54 on comfort.

Pick tire B You want the most grip on dry roads

Toyo Open Country M/T scores 68 vs 64 on dry.

Tire A · Cooper Discoverer STT PRO
Check price on Amazon
Tire B · Toyo Open Country M/T
Check price on Amazon

TireWheelGuide may earn a commission from purchases made through these links.

Discoverer STT PRO or Open Country M/T?

Which is better in the wet, Discoverer STT PRO or Open Country M/T?

Toyo Open Country M/T, 72 vs 68 on our wet score.

Which grips better on dry roads, Discoverer STT PRO or Open Country M/T?

Toyo Open Country M/T, 68 vs 64 on our dry score.

Which is better in snow, Discoverer STT PRO or Open Country M/T?

Neither, by our numbers: 67 vs 68 on the snow score, within 3 points.

Which is quieter, Discoverer STT PRO or Open Country M/T?

Toyo Open Country M/T, 64 vs 53 on our noise score.

Which is more comfortable, Discoverer STT PRO or Open Country M/T?

Toyo Open Country M/T, 62 vs 54 on our comfort score.

Which lasts longer, Discoverer STT PRO or Open Country M/T?

Toyo Open Country M/T, 65 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