Tests – · none yet Owners 59 · 422 reviews
“New shoes. Cooper Discoverer STT Pro. 285/75/16”
Head-to-head
Updated
Cooper Discoverer STT PRO vs General Grabber X3 — 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 + 119 owner reviews. How we score
Grabber X3 leads, 65–63 Narrow edge
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Tests – · none yet Owners 64 · 119 reviews
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
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64
Dry
Grabber X3 +468Why this score
Source Discoverer STT PRO Grabber X3 Professional tests (TWG score) ≈ 66 (est.) ≈ 68 (est.) Reviews found online 63 69 Discoverer STT PRO: 60% × 65.7 (est.) + 40% × 62.5 = 64
Grabber X3: 60% × 68.3 (est.) + 40% × 68.8 = 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 Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).
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68
Wet
Grabber X3 +169Why this score
Source Discoverer STT PRO Grabber X3 Professional tests (TWG score) ≈ 68 (est.) ≈ 70 (est.) Reviews found online 67 69 Discoverer STT PRO: 60% × 68.5 (est.) + 40% × 66.6 = 68
Grabber X3: 60% × 69.8 (est.) + 40% × 69 = 69
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 Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
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67
Snow
Grabber X3 +269Why this score
Source Discoverer STT PRO Grabber X3 Professional tests (TWG score) ≈ 69 (est.) ≈ 70 (est.) Reviews found online 65 68 Discoverer STT PRO: 60% × 68.6 (est.) + 40% × 64.5 = 67
Grabber X3: 60% × 69.8 (est.) + 40% × 68.4 = 69
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 Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).
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54
Comfort
Grabber X3 +357Why this score
Source Discoverer STT PRO Grabber X3 Professional tests (TWG score) ≈ 64 (est.) ≈ 65 (est.) Reviews found online 48 51 Discoverer STT PRO: 40% × 64.4 (est.) + 60% × 47.6 = 54
Grabber X3: 40% × 65.2 (est.) + 60% × 51.3 = 57
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 Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).
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53
Noise
Grabber X3 +659Why this score
Source Discoverer STT PRO Grabber X3 Professional tests (TWG score) ≈ 66 (est.) ≈ 66 (est.) Reviews found online 32 48 Discoverer STT PRO: 60% × 66.4 (est.) + 40% × 32 = 53
Grabber X3: 60% × 66.4 (est.) + 40% × 47.5 = 59
No road tests of noise for Discoverer STT PRO or Grabber X3. The test half is the tested tires’ average (66): owners’ noise ratings barely follow the road tests.
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62
Treadwear
Grabber X3 +365Why this score
Source Discoverer STT PRO Grabber X3 Professional tests (TWG score) ≈ 64 (est.) ≈ 65 (est.) Reviews found online 60 63 Discoverer STT PRO: 60% × 64.1 (est.) + 40% × 59.7 = 62
Grabber X3: 60% × 65.4 (est.) + 40% × 63.4 = 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 Grabber X3. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).
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52
Handling (owners)
Grabber X3 +153Why this score
Source Discoverer STT PRO Grabber X3 Reviews found online 52 53
Scores at a glance
| Category | Cooper Discoverer STT PRO | General Grabber X3 |
|---|---|---|
| Relative Score | 63 | 65 |
| Dry | 64 | 68 |
| Wet | 68 | 69 |
| Snow | 67 | 69 |
| Comfort | 54 | 57 |
| Noise | 53 | 59 |
| Treadwear | 62 | 65 |
| Handling (owners) | 52 | 53 |
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
63
/ 100
Discoverer STT PRO
65
/ 100
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
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
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Tire A
Positive
Cooper Discoverer STT PRO
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
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 |
|---|---|---|
| Category | Mud-Terrain tire | Mud-Terrain tire |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 23 | 6 |
| Rim diameters | 16″ – 20″ | 16″ – 18″ |
| Tread depth | 18 - 22/32″ | 18 - 21/32″ |
| UTQG | — | AA A |
| Sidewall | Black Side Wall - Raised White Lettering | Black Side Wall - Serrated Raised Lettering |
| Max pressure | 35 - 80 psi | 35 - 80 psi |
| Sizes in common | 6 | 6 |
Which one should you actually buy?
63
/ 100
Cooper Discoverer STT PRO
65
/ 100
General Grabber X3
Narrow edge: General Grabber X3 — better noise, dry and comfort. It leads or ties in every category we score.
Pick tire B
You want a quieter cabin
General Grabber X3 scores 59 vs 53 on noise.
Pick tire B
You want the most grip on dry roads
General Grabber X3 scores 68 vs 64 on dry.
Pick tire B
You want the most comfortable ride
General Grabber X3 scores 57 vs 54 on comfort.
Pick tire B
You want the longest tread life
General Grabber X3 scores 65 vs 62 on treadwear.
Tire A · Cooper Discoverer STT PRO
Tire B · General Grabber X3
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Discoverer STT PRO or Grabber X3?
Which is better in the wet, Discoverer STT PRO or Grabber X3?
Neither, by our numbers: 68 vs 69 on the wet score, within 3 points.
Which grips better on dry roads, Discoverer STT PRO or Grabber X3?
General Grabber X3, 68 vs 64 on our dry score.
Which is better in snow, Discoverer STT PRO or Grabber X3?
Neither, by our numbers: 67 vs 69 on the snow score, within 3 points.
Which is quieter, Discoverer STT PRO or Grabber X3?
General Grabber X3, 59 vs 53 on our noise score.
Which is more comfortable, Discoverer STT PRO or Grabber X3?
General Grabber X3, 57 vs 54 on our comfort score.
Which lasts longer, Discoverer STT PRO or Grabber X3?
General Grabber X3, 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