Tests – · none yet Owners – · 2 reviews (needs 5)
Yokohama Geolandar G91F looks discontinued: no new owner reviews or road tests in five years and no current EU tyre label.
Head-to-head
Updated
Yokohama Geolandar G91F vs Toyo Observe GSi-6 HP — 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 + 2 road tests and 2 + 14 owner reviews. How we score
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Tests 69 · 2 tests Owners 73 · 14 reviews
Best test result: #5 of 20 in 2020 Nordic and Studded Winter Tyre Test (dry braking)
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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Dry
No comparison75Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) · – / 1 tests – 73 Reviews found online – 77 Observe GSi-6 HP: 60% × 73 + 40% × 77.4 = 75
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Wet
No comparison75Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) · – / 2 tests – 71 Reviews found online – 81 Observe GSi-6 HP: 60% × 71.2 + 40% × 81 = 75
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Snow
No comparison66Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) · – / 2 tests – 60 Reviews found online – 75 Observe GSi-6 HP: 60% × 59.7 + 40% × 75.2 = 66
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Comfort
No comparison76Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) · – / 1 tests – 78 Reviews found online – 74 Observe GSi-6 HP: 40% × 77.5 + 60% × 74.4 = 76
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Noise
No comparison70Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) · – / 1 tests – 72 Reviews found online – ≈ 67 (est.) Observe GSi-6 HP: 60% × 71.7 + 40% × 66.6 (est.) = 70
No owner ratings of noise for Observe GSi-6 HP. The owner half is the owners’ average (67): owners’ noise ratings barely follow the road tests, so the tests say nothing about how owners would rate it.
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Treadwear
No comparison61Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) – ≈ 63 (est.) Reviews found online – 58 Observe GSi-6 HP: 60% × 63.4 (est.) + 40% × 58.3 = 61
No road tests of treadwear for Observe GSi-6 HP. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
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Handling (owners)
No comparison76Why this score
Source Geolandar G91F Observe GSi-6 HP Reviews found online – 76 -
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Efficiency
No comparison66Why this score
Source Geolandar G91F Observe GSi-6 HP Professional tests (TWG score) · – / 1 tests – 66
Scores at a glance
| Category | Yokohama Geolandar G91F | Toyo Observe GSi-6 HP |
|---|---|---|
| Relative Score | – | 72 |
| Dry | – | 75 |
| Wet | – | 75 |
| Snow | – | 66 |
| Comfort | – | 76 |
| Noise | – | 70 |
| Treadwear | – | 61 |
| Handling (owners) | – | 76 |
| Efficiency | – | 66 |
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
Not important
NotLessNeutralImportantMost
Recomputed
Headline score
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/ 100
Geolandar G91F
72
/ 100
Observe GSi-6 HP
Only categories both tires have data for count toward the headline score.
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Geolandar G91F
Not enough owner reviews yet to extract themes.
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 · Yokohama Geolandar G91F | B · Toyo Observe GSi-6 HP |
|---|---|---|
| Category | All-Season tire | Winter |
| Vehicle type | SUV and 4x4 | — |
| Sizes available | 1 | 39 |
| Rim diameters | 17″ | 16″ – 21″ |
| Tread depth | 10/32″ | 11 - 12/32″ |
| UTQG | 320 B A | — |
| Sidewall | Blackwall | Black Side Wall |
| Max pressure | 51 psi | 50 - 51 psi |
Which one should you actually buy?
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/ 100
Yokohama Geolandar G91F
72
/ 100
Toyo Observe GSi-6 HP
Only Toyo Observe GSi-6 HP has enough test and review data for a Relative Score, so there is no head-to-head winner yet.
Tire A · Yokohama Geolandar G91F
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.
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