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Head-to-head Updated

Cooper Discoverer STT PRO vs General Grabber X3 — Compared

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

Grabber X3 leads, 67–63 Narrow edge

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Tire ACooper

Discoverer STT PRO

All Season

Tests – · none yet Owners 60 · 421 reviews

“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”

Tire BGeneral

Grabber X3

All Season

Tests – · none yet Owners 66 · 119 reviews

Category by category

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

  1. 65

    Dry

    Grabber X3 +5
    70
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online6371
  2. 67

    Wet

    Grabber X3 +4
    71
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online6671
  3. 66

    Snow

    Grabber X3 +4
    70
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online6470
  4. 61

    Comfort

    Grabber X3 +3
    64
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online5258
  5. 54

    Noise

    Grabber X3 +7
    61
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online3452
  6. 63

    Treadwear

    Grabber X3 +2
    65
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online6265
  7. 54

    Handling

    Grabber X3 +4
    58
    Why this score
    SourceDiscoverer STT PROGrabber X3
    Reviews found online5458
Scores at a glance
CategoryCooper Discoverer STT PROGeneral Grabber X3
Relative Score 63 67
Dry 65 70
Wet 67 71
Snow 66 70
Comfort 61 64
Noise 54 61
Treadwear 63 65
Handling 54 58

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

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Recomputed
Headline score

Discoverer STT PRO

Grabber X3

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 Grabber X3

Pros

  • Exceptional off-road traction in mud, sand, rocks, and snow
  • Surprisingly quiet on the highway for a mud-terrain tire
  • Aggressive and appealing visual design, including popular red lettering

Cons

  • Initial high-speed handling instability or 'squirminess' reported by some drivers
  • Prone to throwing rocks and debris, potentially chipping paint
  • Occasional reports of rapid or uneven tread wear and cupping
All owner themes in the Grabber X3 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.

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”
ford-trucks.com

“I had a set in 295/70R18. The first 50% was good all around. However they got really noisy as they wore to the point you couldn't hold a conversation in the cab. At that point they had to go.”
therangerstation.com ·1 upvote ·2019-09-30

“They (Cooper Discover SST Pro's) are louder than an all season for sure but not louder than my Buckshots that I ran years ago. A friend has them on his truck, '08 Ford F250 Super Duty diesel, his only complaint is how loud they were for him since the truck drives on pavement most times except on a construction site. I have driven this truck numerous times and the Cooper SST pro's have great traction both on and off road but seem, IMO, to wear quickly on pavement, for the reasons Jim Oaks mentioned, so He will not get them for his application again.... Wish they made them in my size though. So in short I agree with Jim that these are a good tire especially for its intended application.”
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

General Grabber X3

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

Specs side by side

Attribute A · Cooper Discoverer STT PRO B · General Grabber X3
CategoryAll SeasonAll Season
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available236
Rim diameters16″ – 20″16″ – 18″
Tread depth18 - 22/32″18 - 21/32″
UTQG—AA A
SidewallBlack Side Wall - Raised White LetteringBlack Side Wall - Serrated Raised Lettering
Max pressure35 - 80 psi35 - 80 psi

Which one should you actually buy?

Cooper Discoverer STT PRO

General Grabber X3

Winner: General Grabber X3 — better noise, dry and wet. It leads or ties in every category we score.

Pick tire B You want a quieter cabin

General Grabber X3 scores 61 vs 54 on noise.

Pick tire B You want the most grip on dry roads

General Grabber X3 scores 70 vs 65 on dry.

Pick tire B Your priority is wet-weather safety

General Grabber X3 scores 71 vs 67 on wet.

Pick tire B You drive through snowy winters

General Grabber X3 scores 70 vs 66 on snow.

Tire A · Cooper Discoverer STT PRO
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Tire B · General Grabber X3
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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.

67

Narrow edge

Grabber X3

Amazon