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Cooper Discoverer STT PRO vs Pirelli Scorpion All Terrain Plus — 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 + 1 road tests and 422 + 94 owner reviews. How we score

Scorpion All Terrain Plus is ahead, 73–63

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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. 64

    Dry

    Scorpion All Terrain Plus +7
    71
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Professional tests (TWG score)≈ 66 (est.)≈ 70 (est.)
    Reviews found online6373

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

    Scorpion All Terrain Plus: 60% × 69.9 (est.) + 40% × 72.6 = 71

    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 Scorpion All Terrain Plus. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 68

    Wet

    Scorpion All Terrain Plus +10
    78
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Professional tests (TWG score)≈ 68 (est.)≈ 76 (est.)
    Reviews found online6781

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

    Scorpion All Terrain Plus: 60% × 76.2 (est.) + 40% × 80.8 = 78

    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 Scorpion All Terrain Plus. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 67

    Snow

    Scorpion All Terrain Plus +6
    73
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Professional tests (TWG score)≈ 69 (est.)≈ 72 (est.)
    Reviews found online6576

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

    Scorpion All Terrain Plus: 60% × 72.1 (est.) + 40% × 75.5 = 73

    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 Scorpion All Terrain Plus. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

  4. 54

    Comfort

    Scorpion All Terrain Plus +17
    71
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Professional tests (TWG score)≈ 64 (est.)≈ 69 (est.)
    Reviews found online4872

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

    Scorpion All Terrain Plus: 40% × 69.2 (est.) + 60% × 71.6 = 71

    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 Scorpion All Terrain Plus. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  5. 53

    Noise

    Scorpion All Terrain Plus +14
    67
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Professional tests (TWG score)≈ 66 (est.)≈ 66 (est.)
    Reviews found online3267

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

    Scorpion All Terrain Plus: 60% × 66.4 (est.) + 40% × 66.6 = 67

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

  6. 62

    Treadwear

    Scorpion All Terrain Plus +6
    68
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Professional tests (TWG score) · – / 1 tests≈ 64 (est.)67
    Reviews found online6070

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

    Scorpion All Terrain Plus: 60% × 66.9 + 40% × 69.9 = 68

    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. 52

    Handling (owners)

    Scorpion All Terrain Plus +23
    75
    Why this score
    SourceDiscoverer STT PROScorpion All Terrain Plus
    Reviews found online5275
Scores at a glance
CategoryCooper Discoverer STT PROPirelli Scorpion All Terrain Plus
Relative Score 63 73
Dry 64 71
Wet 68 78
Snow 67 73
Comfort 54 71
Noise 53 67
Treadwear 62 68
Handling (owners) 52 75

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

± 8

Scorpion All Terrain Plus

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 Scorpion All Terrain Plus

Pros

  • Exceptional wet, mud, and winter/snow traction (3-peak mountain snowflake certified)
  • Surprisingly quiet and smooth ride on the highway compared to aggressive competitors
  • Aggressive, attractive sidewall and tread styling that enhances vehicle appearance

Cons

  • Some users reported persistent balancing issues or vibrations at highway speeds
  • A few drivers noted increased road noise or uneven shoulder wear as the tires aged
  • Minor reduction in fuel economy reported by some truck and SUV owners
All owner themes in the Scorpion All Terrain Plus 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

Pirelli Scorpion All Terrain Plus

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

Specs side by side

Attribute A · Cooper Discoverer STT PRO B · Pirelli Scorpion All Terrain Plus
CategoryMud-Terrain tireAll-Terrain tire
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available2329
Rim diameters16″ – 20″16″ – 20″
Tread depth18 - 22/32″12 - 16/32″
UTQG—640 A B
Treadwear warranty—50,000 mi
SidewallBlack Side Wall - Raised White LetteringBlack Side Wall - Raised White Lettering
Max pressure35 - 80 psi44 - 80 psi
Sizes in common88

Which one should you actually buy?

Cooper Discoverer STT PRO

Pirelli Scorpion All Terrain Plus

Winner: Pirelli Scorpion All Terrain Plus — better handling, comfort and noise. It leads or ties in every category we score.

Pick tire B You enjoy sharp, responsive handling

Pirelli Scorpion All Terrain Plus scores 75 vs 52 on handling.

Pick tire B You want the most comfortable ride

Pirelli Scorpion All Terrain Plus scores 71 vs 54 on comfort.

Pick tire B You want a quieter cabin

Pirelli Scorpion All Terrain Plus scores 67 vs 53 on noise.

Pick tire B Your priority is wet-weather safety

Pirelli Scorpion All Terrain Plus scores 78 vs 68 on wet.

Tire A · Cooper Discoverer STT PRO
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Tire B · Pirelli Scorpion All Terrain Plus
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Discoverer STT PRO or Scorpion All Terrain Plus?

Which is better in the wet, Discoverer STT PRO or Scorpion All Terrain Plus?

Pirelli Scorpion All Terrain Plus, 78 vs 68 on our wet score.

Which grips better on dry roads, Discoverer STT PRO or Scorpion All Terrain Plus?

Pirelli Scorpion All Terrain Plus, 71 vs 64 on our dry score.

Which is better in snow, Discoverer STT PRO or Scorpion All Terrain Plus?

Pirelli Scorpion All Terrain Plus, 73 vs 67 on our snow score.

Which is quieter, Discoverer STT PRO or Scorpion All Terrain Plus?

Pirelli Scorpion All Terrain Plus, 67 vs 53 on our noise score.

Which is more comfortable, Discoverer STT PRO or Scorpion All Terrain Plus?

Pirelli Scorpion All Terrain Plus, 71 vs 54 on our comfort score.

Which lasts longer, Discoverer STT PRO or Scorpion All Terrain Plus?

Pirelli Scorpion All Terrain Plus, 68 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