tirewheelguide
Head-to-head Updated

Pirelli Sottozero Serie II 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 31 + 14 owner reviews. How we score

Too close to call: Sottozero Serie II and Observe GSi-6 HP are level at 71.

Check price on Amazon · Sottozero Serie II Check price on Amazon · Observe GSi-6 HP
Add your size for an exact match
/R

Both Amazon links then search this exact size.

TireWheelGuide may earn a commission from purchases made through these links.

Toyo Observe GSi-6 HP
Tire BToyo

Observe GSi-6 HP

Winter

± 6

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.

  1. 70

    Dry

    Observe GSi-6 HP +5
    75
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score) · – / 1 tests≈ 70 (est.)73
    Reviews found online7277

    Sottozero Serie II: 60% × 69.5 (est.) + 40% × 71.8 = 70

    Observe GSi-6 HP: 60% × 73 + 40% × 76.9 = 75

    No road tests of dry for Sottozero Serie II. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 77

    Wet

    Sottozero Serie II +2
    75
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score) · – / 2 tests≈ 75 (est.)71
    Reviews found online7981

    Sottozero Serie II: 60% × 75.4 (est.) + 40% × 79.2 = 77

    Observe GSi-6 HP: 60% × 71.5 + 40% × 80.7 = 75

    No road tests of wet for Sottozero Serie II. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 66

    Snow

    Level
    66
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score) · – / 2 tests≈ 68 (est.)60
    Reviews found online6375

    Sottozero Serie II: 60% × 68.2 (est.) + 40% × 63.4 = 66

    Observe GSi-6 HP: 60% × 59.5 + 40% × 74.7 = 66

    No road tests of snow for Sottozero Serie II. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

  4. 72

    Comfort

    Observe GSi-6 HP +3
    75
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score) · – / 1 tests≈ 70 (est.)77
    Reviews found online7474

    Sottozero Serie II: 40% × 69.8 (est.) + 60% × 74.1 = 72

    Observe GSi-6 HP: 40% × 76.6 + 60% × 73.8 = 75

    No road tests of comfort for Sottozero Serie II. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  5. –

    Noise

    No comparison
    69
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score) · – / 1 tests–72
    Reviews found online–≈ 66 (est.)

    Observe GSi-6 HP: 60% × 71.6 + 40% × 66.3 (est.) = 69

    No owner ratings of noise for Observe GSi-6 HP. The owner half is the owners’ average (66): owners’ noise ratings barely follow the road tests, so the tests say nothing about how owners would rate it.

  6. 70

    Treadwear

    Sottozero Serie II +8
    62
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score)≈ 68 (est.)≈ 64 (est.)
    Reviews found online7259

    Sottozero Serie II: 60% × 68.3 (est.) + 40% × 71.6 = 70

    Observe GSi-6 HP: 60% × 63.7 (est.) + 40% × 58.5 = 62

    No road tests of treadwear for Sottozero Serie II. 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 Observe GSi-6 HP. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

  7. 74

    Handling (owners)

    Observe GSi-6 HP +1
    75
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Reviews found online7475
  8. –

    Efficiency

    No comparison
    66
    Why this score
    SourceSottozero Serie IIObserve GSi-6 HP
    Professional tests (TWG score) · – / 1 tests–66
Scores at a glance
CategoryPirelli Sottozero Serie IIToyo Observe GSi-6 HP
Relative Score 71 71
Dry 70 75
Wet 77 75
Snow 66 66
Comfort 72 75
Noise – 69
Treadwear 70 62
Handling (owners) 74 75
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
Important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost

Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.

Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Not important
NotLessNeutralImportantMost

Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.

Recomputed
Headline score
± 8

Sottozero Serie II

± 6

Observe GSi-6 HP

Only categories both tires have data for count toward the headline score.

The professional test results behind the scores

Per discipline: the average % of the best tire over every test both tires were in, and how many of those tests each one won. “Different tests” rows compare results from separate tests.

DisciplineCategorySottozero Serie IIObserve GSi-6 HPΔHead-to-head
Also published by the testers (not in the score)
Overall Ranking Overall #2/9 2012 Auto Bild Performance Winter Tyre Test #12/20 2025 Studded, Friction and European Winter Tyre Test – Different tests

Pros, cons & observations

Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.

Tire A Sottozero Serie II

Pros

  • Exceptional wet and standing water grip with strong resistance to aquaplaning
  • Surprisingly confident, communicative handling and short braking distances on dry roads
  • High levels of ride comfort and remarkably low road noise, even on low-profile sizes

Cons

  • Subpar traction and grip in deep snow or severe ice according to a minority of reviewers
  • High initial purchase price
  • Soften up and exhibit slightly reduced predictability or increased noise in warmer temperatures above 7°C (45°F)
All owner themes in the Sottozero Serie II review

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
All owner themes in the Observe GSi-6 HP review

Specs side by side

Attribute A · Pirelli Sottozero Serie II B · Toyo Observe GSi-6 HP
CategoryWinterWinter
Vehicle typePassenger Car / Crossover—
Sizes available—39
Rim diameters—16″ – 21″
Tread depth—11 - 12/32″
Sidewall—Black Side Wall
Max pressure—50 - 51 psi

Which one should you actually buy?

Pirelli Sottozero Serie II

Toyo Observe GSi-6 HP

Too close to call: Pirelli Sottozero Serie II and Toyo Observe GSi-6 HP are within 2 points overall. Pirelli Sottozero Serie II is stronger on treadwear. Toyo Observe GSi-6 HP is stronger on dry and comfort.

Pick tire A You want the longest tread life

Pirelli Sottozero Serie II scores 70 vs 62 on treadwear.

Pick tire B You want the most grip on dry roads

Toyo Observe GSi-6 HP scores 75 vs 70 on dry.

Pick tire B You want the most comfortable ride

Toyo Observe GSi-6 HP scores 75 vs 72 on comfort.

Tire A · Pirelli Sottozero Serie II
Check price on Amazon
Tire B · Toyo Observe GSi-6 HP
Check price on Amazon

TireWheelGuide may earn a commission from purchases made through these links.

Sottozero Serie II or Observe GSi-6 HP?

Which is better in the wet, Sottozero Serie II or Observe GSi-6 HP?

Neither, by our numbers: 77 vs 75 on the wet score, within 3 points.

Which grips better on dry roads, Sottozero Serie II or Observe GSi-6 HP?

Toyo Observe GSi-6 HP, 75 vs 70 on our dry score.

Which is better in snow, Sottozero Serie II or Observe GSi-6 HP?

Neither, by our numbers: 66 vs 66 on the snow score, within 3 points.

Which is more comfortable, Sottozero Serie II or Observe GSi-6 HP?

Toyo Observe GSi-6 HP, 75 vs 72 on our comfort score.

Which lasts longer, Sottozero Serie II or Observe GSi-6 HP?

Pirelli Sottozero Serie II, 70 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