tirewheelguide

Bridgestone Ecopia EP422 looks discontinued: no new owner reviews or road tests in five years and no current EU tyre label.

Michelin Latitude Diamaris looks discontinued: no new owner reviews or road tests in five years and no current EU tyre label.

Head-to-head Updated

Bridgestone Ecopia EP422 vs Michelin Latitude Diamaris — 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 15 + 5 owner reviews. How we score

Latitude Diamaris is ahead, 70–57

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Category by category

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

  1. 56

    Dry

    Latitude Diamaris +16
    72
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Professional tests (TWG score)≈ 60 (est.)≈ 70 (est.)
    Reviews found online4974

    Ecopia EP422: 60% × 60.1 (est.) + 40% × 49 = 56

    Latitude Diamaris: 60% × 70.5 (est.) + 40% × 73.7 = 72

    No road tests of dry for Ecopia EP422. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).

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

  2. 58

    Wet

    Latitude Diamaris +12
    70
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Professional tests (TWG score)≈ 61 (est.)≈ 70 (est.)
    Reviews found online5470

    Ecopia EP422: 60% × 61.3 (est.) + 40% × 53.7 = 58

    Latitude Diamaris: 60% × 70.2 (est.) + 40% × 69.8 = 70

    No road tests of wet for Ecopia EP422. 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 Latitude Diamaris. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).

  3. 55

    Snow

    No comparison
    –
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Professional tests (TWG score)≈ 62 (est.)–
    Reviews found online46–

    Ecopia EP422: 60% × 61.5 (est.) + 40% × 46.1 = 55

    No road tests of snow for Ecopia EP422. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).

  4. 54

    Comfort

    Latitude Diamaris +15
    69
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Professional tests (TWG score)≈ 65 (est.)≈ 69 (est.)
    Reviews found online4669

    Ecopia EP422: 40% × 65 (est.) + 60% × 46.4 = 54

    Latitude Diamaris: 40% × 69 (est.) + 60% × 68.6 = 69

    No road tests of comfort for Ecopia EP422 or Latitude Diamaris. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.

  5. 63

    Noise

    No comparison
    –
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Professional tests (TWG score)≈ 67 (est.)–
    Reviews found online57–

    Ecopia EP422: 60% × 66.6 (est.) + 40% × 57.1 = 63

    No road tests of noise for Ecopia EP422. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.

  6. 60

    Treadwear

    Latitude Diamaris +8
    68
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Professional tests (TWG score)≈ 63 (est.)≈ 67 (est.)
    Reviews found online5669

    Ecopia EP422: 60% × 62.5 (est.) + 40% × 55.9 = 60

    Latitude Diamaris: 60% × 67.3 (est.) + 40% × 69.4 = 68

    No road tests of treadwear for Ecopia EP422. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).

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

  7. –

    Handling (owners)

    No comparison
    68
    Why this score
    SourceEcopia EP422Latitude Diamaris
    Reviews found online–68
Scores at a glance
CategoryBridgestone Ecopia EP422Michelin Latitude Diamaris
Relative Score 57 70
Dry 56 72
Wet 58 70
Snow 55 –
Comfort 54 69
Noise 63 –
Treadwear 60 68
Handling (owners) – 68

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

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

Recomputed
Headline score
± 8

Ecopia EP422

± 8

Latitude Diamaris

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 Ecopia EP422

Not enough owner reviews yet to extract themes.

Tire B Latitude Diamaris

Pros

  • Exceptional tread life with many users reporting 40,000+ miles
  • High fuel efficiency compared to newer successor models
  • Strong dry-weather grip and handling feedback

Cons

  • Inconsistent wet-weather performance and susceptibility to hydroplaning
  • Poor traction in snow and icy conditions
  • High initial purchase price
All owner themes in the Latitude Diamaris review

Specs side by side

Attribute A · Bridgestone Ecopia EP422 B · Michelin Latitude Diamaris
CategoryAll-Season tireSummer
Vehicle typePassenger Car / CrossoverSUV and 4x4
Sizes available6—
Rim diameters15″ – 17″—
Tread depth10/32″—
UTQG480 A A—
Treadwear warranty65,000 mi—
SidewallBlackwall—
Max pressure51 psi—

Which one should you actually buy?

Bridgestone Ecopia EP422

Michelin Latitude Diamaris

Winner: Michelin Latitude Diamaris — better dry, comfort and wet. It leads or ties in every category we score. Bridgestone Ecopia EP422 rests on little evidence so far (0 tests, 15 reviews), so read this result as provisional. Michelin Latitude Diamaris rests on little evidence so far (0 tests, 5 reviews), so read this result as provisional.

Pick tire B You want the most grip on dry roads

Michelin Latitude Diamaris scores 72 vs 56 on dry.

Pick tire B You want the most comfortable ride

Michelin Latitude Diamaris scores 69 vs 54 on comfort.

Pick tire B Your priority is wet-weather safety

Michelin Latitude Diamaris scores 70 vs 58 on wet.

Pick tire B You want the longest tread life

Michelin Latitude Diamaris scores 68 vs 60 on treadwear.

Tire A · Bridgestone Ecopia EP422
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Tire B · Michelin Latitude Diamaris
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Ecopia EP422 or Latitude Diamaris?

Which is better in the wet, Ecopia EP422 or Latitude Diamaris?

Michelin Latitude Diamaris, 70 vs 58 on our wet score.

Which grips better on dry roads, Ecopia EP422 or Latitude Diamaris?

Michelin Latitude Diamaris, 72 vs 56 on our dry score.

Which is more comfortable, Ecopia EP422 or Latitude Diamaris?

Michelin Latitude Diamaris, 69 vs 54 on our comfort score.

Which lasts longer, Ecopia EP422 or Latitude Diamaris?

Michelin Latitude Diamaris, 68 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