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Head-to-head Updated

Dunlop Grandtrek AT20 vs General Altimax One S — 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 + 4 road tests and 57 + 17 owner reviews. How we score

Altimax One S is ahead, 65–43

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General Altimax One S
Tire BGeneral

Altimax One S

Summer

± 6

Tests 61 · 4 tests Owners 71 · 17 reviews

Best test result: #16 of 50 in 2023 ADAC Summer Tyre Test (wear)

Category by category

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

  1. 41

    Dry

    Altimax One S +18
    59
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score) · – / 4 tests≈ 51 (est.)50
    Reviews found online2772

    Grandtrek AT20: 60% × 50.9 (est.) + 40% × 27.3 = 41

    Altimax One S: 60% × 50.4 + 40% × 71.7 = 59

    No road tests of dry for Grandtrek AT20. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).

  2. 42

    Wet

    Altimax One S +22
    64
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score) · – / 4 tests≈ 49 (est.)59
    Reviews found online3272

    Grandtrek AT20: 60% × 49 (est.) + 40% × 31.5 = 42

    Altimax One S: 60% × 59.3 + 40% × 71.8 = 64

    No road tests of wet for Grandtrek AT20. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 49

    Snow

    No comparison
    –
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score)≈ 58 (est.)–
    Reviews found online36–

    Grandtrek AT20: 60% × 57.9 (est.) + 40% × 36.3 = 49

    No road tests of snow for Grandtrek AT20. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).

  4. 43

    Comfort

    Altimax One S +24
    67
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score)≈ 62 (est.)≈ 69 (est.)
    Reviews found online3066

    Grandtrek AT20: 40% × 62 (est.) + 60% × 30.1 = 43

    Altimax One S: 40% × 68.6 (est.) + 60% × 66.1 = 67

    No road tests of comfort for Grandtrek AT20 or Altimax One S. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.

  5. 56

    Noise

    No comparison
    –
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score)≈ 67 (est.)–
    Reviews found online40–

    Grandtrek AT20: 60% × 66.6 (est.) + 40% × 39.7 = 56

    No road tests of noise for Grandtrek AT20. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.

  6. 51

    Treadwear

    Altimax One S +21
    72
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score) · – / 1 tests≈ 57 (est.)72
    Reviews found online4172

    Grandtrek AT20: 60% × 57.5 (est.) + 40% × 41.2 = 51

    Altimax One S: 60% × 72 + 40% × 72.2 = 72

    No road tests of treadwear for Grandtrek AT20. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).

  7. 33

    Handling (owners)

    Altimax One S +36
    69
    Why this score
    SourceGrandtrek AT20Altimax One S
    Reviews found online3369
  8. –

    Efficiency

    No comparison
    73
    Why this score
    SourceGrandtrek AT20Altimax One S
    Professional tests (TWG score) · – / 1 tests–73
Scores at a glance
CategoryDunlop Grandtrek AT20General Altimax One S
Relative Score 43 65
Dry 41 59
Wet 42 64
Snow 49 –
Comfort 43 67
Noise 56 –
Treadwear 51 72
Handling (owners) 33 69
Efficiency – 73

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
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

Grandtrek AT20

± 6

Altimax One S

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 AT20

Pros

  • Exceptional tread life and high mileage capability (often exceeding 40,000 to 60,000+ miles)
  • Comfortable, smooth, and quiet ride on tarmac and highways
  • Good stability and predictable handling in dry, warm weather conditions

Cons

  • Extremely poor and potentially unsafe traction on wet roads, leading to sliding and long braking distances
  • Unreliable or hazardous performance in winter conditions like snow and ice
  • Subpar off-road capabilities, including low puncture resistance on gravel and poor traction in mud or sand
All owner themes in the Grandtrek AT20 review

Tire B Altimax One S

Pros

  • Exceptional wet-weather grip and high driver confidence in the rain
  • High level of ride comfort and quietness for most daily driving conditions
  • Good tread wear longevity and overall value for money compared to premium brands

Cons

  • Notable tire and road noise reported by multiple users
  • Unresponsive steering feel and lack of sporty handling characteristics
  • Very soft sidewalls that are vulnerable to punctures from minor hazards like thorns
All owner themes in the Altimax One S review

Specs side by side

Attribute A · Dunlop Grandtrek AT20 B · General Altimax One S
CategoryAll-Terrain tireSummer
Vehicle typeSUV and 4x4Passenger Car / Crossover
Sizes available981
Rim diameters15″ – 18″15″ – 20″
SidewallBlackwall—
Sizes in common00

Which one should you actually buy?

Dunlop Grandtrek AT20

General Altimax One S

Winner: General Altimax One S — better handling, comfort and wet. It leads or ties in every category we score.

Pick tire B You enjoy sharp, responsive handling

General Altimax One S scores 69 vs 33 on handling.

Pick tire B You want the most comfortable ride

General Altimax One S scores 67 vs 43 on comfort.

Pick tire B Your priority is wet-weather safety

General Altimax One S scores 64 vs 42 on wet.

Pick tire B You want the longest tread life

General Altimax One S scores 72 vs 51 on treadwear.

Tire A · Dunlop Grandtrek AT20
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Tire B · General Altimax One S
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Grandtrek AT20 or Altimax One S?

Which is better in the wet, Grandtrek AT20 or Altimax One S?

General Altimax One S, 64 vs 42 on our wet score.

Which grips better on dry roads, Grandtrek AT20 or Altimax One S?

General Altimax One S, 59 vs 41 on our dry score.

Which is more comfortable, Grandtrek AT20 or Altimax One S?

General Altimax One S, 67 vs 43 on our comfort score.

Which lasts longer, Grandtrek AT20 or Altimax One S?

General Altimax One S, 72 vs 51 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