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Head-to-head Updated

Goodyear Assurance All-Season vs Kumho IZen KW27 — 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 51 + 32 owner reviews. How we score

IZen KW27 is ahead, 65–60

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Kumho IZen KW27
Tire BKumho

IZen KW27

Winter

± 8

Tests – · none yet Owners 63 · 32 reviews

Category by category

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

  1. 61

    Dry

    Level
    61
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Professional tests (TWG score)≈ 64 (est.)≈ 63 (est.)
    Reviews found online5857

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

    IZen KW27: 60% × 63.4 (est.) + 40% × 57 = 61

    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).

    No road tests of dry for IZen KW27. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.41).

  2. 63

    Wet

    IZen KW27 +5
    68
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Professional tests (TWG score)≈ 65 (est.)≈ 68 (est.)
    Reviews found online6166

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

    IZen KW27: 60% × 68.4 (est.) + 40% × 66.4 = 68

    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).

    No road tests of wet for IZen KW27. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 56

    Snow

    IZen KW27 +11
    67
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Professional tests (TWG score)≈ 63 (est.)≈ 69 (est.)
    Reviews found online4664

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

    IZen KW27: 60% × 68.5 (est.) + 40% × 64.3 = 67

    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).

    No road tests of snow for IZen KW27. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.32).

  4. 61

    Comfort

    IZen KW27 +6
    67
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Professional tests (TWG score)≈ 67 (est.)≈ 68 (est.)
    Reviews found online5866

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

    IZen KW27: 40% × 68.1 (est.) + 60% × 66.1 = 67

    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).

    No road tests of comfort for IZen KW27. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.20).

  5. 65

    Noise

    No comparison
    –
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Professional tests (TWG score)≈ 66 (est.)–
    Reviews found online64–

    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. 60

    Treadwear

    IZen KW27 +5
    65
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Professional tests (TWG score)≈ 63 (est.)≈ 66 (est.)
    Reviews found online5765

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

    IZen KW27: 60% × 65.9 (est.) + 40% × 64.8 = 65

    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).

    No road tests of treadwear for IZen KW27. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.36).

  7. 54

    Handling (owners)

    IZen KW27 +6
    60
    Why this score
    SourceAssurance All-SeasonIZen KW27
    Reviews found online5460
Scores at a glance
CategoryGoodyear Assurance All-SeasonKumho IZen KW27
Relative Score 60 65
Dry 61 61
Wet 63 68
Snow 56 67
Comfort 61 67
Noise 65 –
Treadwear 60 65
Handling (owners) 54 60

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

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

Assurance All-Season

± 8

IZen KW27

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 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

Tire B IZen KW27

Pros

  • Exceptional traction and braking performance on snow and ice
  • High tread longevity and durability over long mileages
  • Quiet and comfortable ride quality

Cons

  • Poor wet-weather grip and high risk of hydroplaning
  • Vague steering feedback and 'floaty' handling characteristics
  • Performance drops significantly when temperatures rise above 8-10°C
All owner themes in the IZen KW27 review

Specs side by side

Attribute A · Goodyear Assurance All-Season B · Kumho IZen KW27
CategoryAll SeasonWinter
Vehicle typePassenger Car / CrossoverPassenger Car / Crossover
Sizes available51—
Rim diameters14″ – 20″—
Tread depth9/32″—
UTQG600 A B—
Treadwear warranty65,000 mi—
SidewallBlackwall—
Max pressure51 psi—

Which one should you actually buy?

Goodyear Assurance All-Season

Kumho IZen KW27

Winner: Kumho IZen KW27 — better snow, comfort and handling. It leads or ties in every category we score.

Pick tire B You drive through snowy winters

Kumho IZen KW27 scores 67 vs 56 on snow.

Pick tire B You want the most comfortable ride

Kumho IZen KW27 scores 67 vs 61 on comfort.

Pick tire B You enjoy sharp, responsive handling

Kumho IZen KW27 scores 60 vs 54 on handling.

Pick tire B Your priority is wet-weather safety

Kumho IZen KW27 scores 68 vs 63 on wet.

Tire A · Goodyear Assurance All-Season
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Tire B · Kumho IZen KW27
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Assurance All-Season or IZen KW27?

Which is better in the wet, Assurance All-Season or IZen KW27?

Kumho IZen KW27, 68 vs 63 on our wet score.

Which grips better on dry roads, Assurance All-Season or IZen KW27?

Neither, by our numbers: 61 vs 61 on the dry score, within 3 points.

Which is better in snow, Assurance All-Season or IZen KW27?

Kumho IZen KW27, 67 vs 56 on our snow score.

Which is more comfortable, Assurance All-Season or IZen KW27?

Kumho IZen KW27, 67 vs 61 on our comfort score.

Which lasts longer, Assurance All-Season or IZen KW27?

Kumho IZen KW27, 65 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