Tests 69 · 2 tests Owners 73 · 14 reviews
Best test result: #5 of 20 in 2020 Nordic and Studded Winter Tyre Test (dry braking)
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
Toyo Observe GSi-6 HP vs Yokohama Geolandar G91F — 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 2 + 0 road tests and 14 + 2 owner reviews. How we score
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Tests – · none yet Owners – · 2 reviews (needs 5)
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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75
Dry
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F 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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75
Wet
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F 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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66
Snow
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F 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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76
Comfort
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F 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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70
Noise
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F 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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61
Treadwear
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F 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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76
Handling (owners)
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F Reviews found online 76 – -
66
Efficiency
No comparison–Why this score
Source Observe GSi-6 HP Geolandar G91F Professional tests (TWG score) · 1 / – tests 66 –
Scores at a glance
| Category | Toyo Observe GSi-6 HP | Yokohama Geolandar G91F |
|---|---|---|
| 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
72
/ 100
Observe GSi-6 HP
–
/ 100
Geolandar G91F
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 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
Tire B Geolandar G91F
Not enough owner reviews yet to extract themes.
Specs side by side
| Attribute | A · Toyo Observe GSi-6 HP | B · Yokohama Geolandar G91F |
|---|---|---|
| Category | Winter | All-Season tire |
| Vehicle type | — | SUV and 4x4 |
| Sizes available | 39 | 1 |
| Rim diameters | 16″ – 21″ | 17″ |
| Tread depth | 11 - 12/32″ | 10/32″ |
| UTQG | — | 320 B A |
| Sidewall | Black Side Wall | Blackwall |
| Max pressure | 50 - 51 psi | 51 psi |
Which one should you actually buy?
72
/ 100
Toyo Observe GSi-6 HP
–
/ 100
Yokohama Geolandar G91F
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 · Toyo Observe GSi-6 HP
Tire B · Yokohama Geolandar G91F
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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