tirewheelguide
Head-to-head Updated

Dunlop Grandtrek ST20 vs Goodyear Assurance All-Season — 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 9 + 51 owner reviews. How we score

Grandtrek ST20 is ahead, 70–61

Check price on Amazon · Grandtrek ST20 or Assurance All-Season on Amazon
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.

Dunlop Grandtrek ST20
Tire ADunlop

Grandtrek ST20

All Season

± 8Provisional

Tests – · none yet Owners 71 · 9 reviews

Category by category

Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.

  1. 69

    Dry

    Grandtrek ST20 +8
    61
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Professional tests (TWG score)≈ 68 (est.)≈ 64 (est.)
    Reviews found online6958

    Grandtrek ST20: 60% × 68.4 (est.) + 40% × 69 = 69

    Assurance All-Season: 60% × 63.8 (est.) + 40% × 57.8 = 61

    No road tests of dry for Grandtrek ST20. 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 Assurance All-Season. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 72

    Wet

    Grandtrek ST20 +9
    63
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Professional tests (TWG score)≈ 72 (est.)≈ 65 (est.)
    Reviews found online7361

    Grandtrek ST20: 60% × 72 (est.) + 40% × 73.1 = 72

    Assurance All-Season: 60% × 65.3 (est.) + 40% × 60.8 = 63

    No road tests of wet for Grandtrek ST20. 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 Assurance All-Season. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. –

    Snow

    No comparison
    56
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Professional tests (TWG score)–≈ 63 (est.)
    Reviews found online–46

    Assurance All-Season: 60% × 62.6 (est.) + 40% × 45.7 = 56

    No road tests of snow for Assurance All-Season. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

  4. 68

    Comfort

    Grandtrek ST20 +7
    61
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Professional tests (TWG score)≈ 68 (est.)≈ 67 (est.)
    Reviews found online6758

    Grandtrek ST20: 40% × 68.3 (est.) + 60% × 67.1 = 68

    Assurance All-Season: 40% × 66.5 (est.) + 60% × 58 = 61

    No road tests of comfort for Grandtrek ST20. 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 Assurance All-Season. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  5. –

    Noise

    No comparison
    65
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Professional tests (TWG score)–≈ 66 (est.)
    Reviews found online–64

    Assurance All-Season: 60% × 66.4 (est.) + 40% × 63.7 = 65

    No road tests of noise for Assurance All-Season. The test half is the tested tires’ average (66): owners’ noise ratings barely follow the road tests.

  6. 69

    Treadwear

    Grandtrek ST20 +9
    60
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Professional tests (TWG score)≈ 68 (est.)≈ 63 (est.)
    Reviews found online7157

    Grandtrek ST20: 60% × 68.2 (est.) + 40% × 71.2 = 69

    Assurance All-Season: 60% × 62.9 (est.) + 40% × 56.5 = 60

    No road tests of treadwear for Grandtrek ST20. 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 Assurance All-Season. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

  7. 71

    Handling (owners)

    Grandtrek ST20 +17
    54
    Why this score
    SourceGrandtrek ST20Assurance All-Season
    Reviews found online7154
Scores at a glance
CategoryDunlop Grandtrek ST20Goodyear Assurance All-Season
Relative Score 70 61
Dry 69 61
Wet 72 63
Snow – 56
Comfort 68 61
Noise – 65
Treadwear 69 60
Handling (owners) 71 54

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

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

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
Recomputed
Headline score
± 8

Grandtrek ST20

± 8

Assurance All-Season

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 Grandtrek ST20

Pros

  • Impressive tread life and overall durability
  • Consistent and predictable handling in mixed weather conditions
  • Strong performance for light off-road and towing applications

Cons

  • Noticeable reduction in wet grip at lower tread depths (below 3mm)
  • Tendency for sidewalls to develop cracks or crazing over time
  • Increased road noise on rough or concrete surfaces
All owner themes in the Grandtrek ST20 review

Tire B Assurance All-Season

Pros

  • High level of ride comfort and low road noise
  • Excellent value for the price point
  • Reliable dry and wet weather traction for non-aggressive drivers

Cons

  • Inconsistent tread life, with reports of premature wear well before the warranty limit
  • Poor performance in winter conditions, specifically on ice and deep snow
  • Occasional reports of vibration and balance issues immediately after installation
All owner themes in the Assurance All-Season review

Specs side by side

Attribute A · Dunlop Grandtrek ST20 B · Goodyear Assurance All-Season
CategoryAll SeasonAll Season
Vehicle typeSUV and 4x4Passenger Car / Crossover
Sizes available351
Rim diameters16″ – 17″14″ – 20″
Tread depth—9/32″
UTQG300 B A - B600 A B
Treadwear warranty—65,000 mi
Sidewall—Blackwall
Max pressure—51 psi
Sizes in common33

Which one should you actually buy?

Dunlop Grandtrek ST20

Goodyear Assurance All-Season

Winner: Dunlop Grandtrek ST20 — better handling, wet and treadwear. It leads or ties in every category we score. Dunlop Grandtrek ST20 rests on little evidence so far (0 tests, 9 reviews), so read this result as provisional.

Pick tire A You enjoy sharp, responsive handling

Dunlop Grandtrek ST20 scores 71 vs 54 on handling.

Pick tire A Your priority is wet-weather safety

Dunlop Grandtrek ST20 scores 72 vs 63 on wet.

Pick tire A You want the longest tread life

Dunlop Grandtrek ST20 scores 69 vs 60 on treadwear.

Pick tire A You want the most grip on dry roads

Dunlop Grandtrek ST20 scores 69 vs 61 on dry.

Tire A · Dunlop Grandtrek ST20
Check price on Amazon
Tire B · Goodyear Assurance All-Season
Check price on Amazon

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

Grandtrek ST20 or Assurance All-Season?

Which is better in the wet, Grandtrek ST20 or Assurance All-Season?

Dunlop Grandtrek ST20, 72 vs 63 on our wet score.

Which grips better on dry roads, Grandtrek ST20 or Assurance All-Season?

Dunlop Grandtrek ST20, 69 vs 61 on our dry score.

Which is more comfortable, Grandtrek ST20 or Assurance All-Season?

Dunlop Grandtrek ST20, 68 vs 61 on our comfort score.

Which lasts longer, Grandtrek ST20 or Assurance All-Season?

Dunlop Grandtrek ST20, 69 vs 60 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