Tests – · none yet Owners 67 · 973 reviews
Best test result: #13 of 13 in 2018 SA4x4 All-Terrain Tire Test R17 (overall ranking)
Head-to-head
Updated
Cooper Discoverer A/T3 vs Toyo Observe GSi-6 HP — Compared
Relative Score (0–100): 60% professional tests, 40% owner reviews.
Observe GSi-6 HP is ahead, 72–67
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Tests 69 · 2 tests Owners 75 · 14 reviews
Best test result: #12 of 20 in 2025 Studded, Friction and European Winter Tyre Test (overall ranking)
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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71
Dry
Observe GSi-6 HP +475Why this score
Source Discoverer A/T3 Observe GSi-6 HP Professional tests (TWG score) – 73 Reviews found online 73 79 -
73
Wet
Observe GSi-6 HP +275Why this score
Source Discoverer A/T3 Observe GSi-6 HP Professional tests (TWG score) – 71 Reviews found online 75 81 -
68
Snow
Discoverer A/T3 +266Why this score
Source Discoverer A/T3 Observe GSi-6 HP Professional tests (TWG score) – 60 Reviews found online 66 75 -
69
Comfort
Observe GSi-6 HP +877Why this score
Source Discoverer A/T3 Observe GSi-6 HP Professional tests (TWG score) – 77 Reviews found online 68 77 -
66
Noise
Observe GSi-6 HP +470Why this score
Source Discoverer A/T3 Observe GSi-6 HP Professional tests (TWG score) – 72 Reviews found online 65 – -
59
Treadwear
Observe GSi-6 HP +665Why this score
Source Discoverer A/T3 Observe GSi-6 HP Reviews found online 54 65 -
65
Handling
Observe GSi-6 HP +1277Why this score
Source Discoverer A/T3 Observe GSi-6 HP Reviews found online 65 77
Scores at a glance
| Category | Cooper Discoverer A/T3 | Toyo Observe GSi-6 HP |
|---|---|---|
| Relative Score | 67 | 72 |
| Dry | 71 | 75 |
| Wet | 73 | 75 |
| Snow | 68 | 66 |
| Comfort | 69 | 77 |
| Noise | 66 | 70 |
| Treadwear | 59 | 65 |
| Handling | 65 | 77 |
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.
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Recomputed
Headline score
67
/ 100
Discoverer A/T3
72
/ 100
Observe GSi-6 HP
The professional test results behind the scores
Each result is shown as % of the best tire in that test. “Same test” rows are the strictest comparison: both tires were measured side by side.
| Discipline | Category | Discoverer A/T3 | Observe GSi-6 HP | Δ | Both? |
|---|---|---|---|---|---|
| Overall Ranking | Overall | 20% #13/13 · 2018 SA4x4 All-Terrain Tire Test R17 | 8% #12/20 · 2025 Studded, Friction and European Winter Tyre Test | +11.7 | Different tests |
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Discoverer A/T3
Pros
- Exceptionally quiet and smooth highway ride for an all-terrain tire
- Great traction and handling on dry and wet pavement
- Strong value and competitive pricing compared to major brand competitors
Cons
- Some users experienced balancing issues and persistent road vibrations
- Faster-than-expected tread wear or premature wear reported by a subset of drivers
- Subpar performance on ice and hard-packed snow for certain vehicle applications
Tire B Observe GSi-6 HP
Pros
- Exceptional traction and stability in snow and slush
- Impressive wet-weather performance and hydroplaning resistance
- Remarkably quiet ride quality for a winter tire
Cons
- Inconsistent tread life reports, with some users experiencing premature wear
- Occasional reports of structural failure or tread separation
- Slightly vague steering feel at lower speeds
Specs side by side
| Attribute | A · Cooper Discoverer A/T3 | B · Toyo Observe GSi-6 HP |
|---|---|---|
| Category | All Season | Winter |
| Vehicle type | SUV and 4x4 | — |
| Sizes available | 14 | 39 |
| Rim diameters | 15″ – 22″ | 16″ – 21″ |
| Tread depth | 14 - 17/32″ | 11 - 12/32″ |
| UTQG | 560 A B | — |
| Sidewall | Black Side Wall - Raised Outline White Lettering | Black Side Wall |
| Max pressure | 44 - 80 psi | 50 - 51 psi |
Which one should you actually buy?
67
/ 100
Cooper Discoverer A/T3
72
/ 100
Toyo Observe GSi-6 HP
Winner: Toyo Observe GSi-6 HP — better handling, comfort and treadwear. It leads or ties in every category we score.
Pick tire B
You enjoy sharp, responsive handling
Toyo Observe GSi-6 HP scores 77 vs 65 on handling.
Pick tire B
You want the most comfortable ride
Toyo Observe GSi-6 HP scores 77 vs 69 on comfort.
Pick tire B
You want the longest tread life
Toyo Observe GSi-6 HP scores 65 vs 59 on treadwear.
Pick tire B
You want the most grip on dry roads
Toyo Observe GSi-6 HP scores 75 vs 71 on dry.
Tire A · Cooper Discoverer A/T3
Tire B · Toyo Observe GSi-6 HP
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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.