Head-to-head Updated

Cooper Discoverer AT3 4S vs Michelin Primacy 4 — Compared

Relative Score (0–100): 60% professional tests, 40% owner reviews.

Primacy 4 leads, 78–77 Narrow edge

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Tire ACooper

Discoverer AT3 4S

All Season

Tests – · 1 test Owners 81 · 688 reviews

Best test result: #5 of 18 in 2022 Consumer Reports All Terrain Truck Tires (overall ranking)

“New shoes today! Cooper Discoverer AT3 4S - 275/65/18”

Tire BMichelin

Primacy 4

Summer

Tests 82 · 23 tests Owners 74 · 13,344 reviews

Best test result: #1 of 10 in 2020 Teknikens 17 Inch Summer Tyre Test (overall ranking)

“Rapid wear on Michelin Primacy 4, 2017 Forester 2017 Forester in Mexico City, where there are lots of potholes and speed bumps and a LOT of rain. I got a set of Michelin Primacy 4+ tires at Costco three years ago and they've got about 30,000 kms -- 16,000 miles on them. Tread is down to about 3.5/32nds (in the middle, slightly less at the sides). The original Geolandars lasted very far beyond that in the same conditions. I'm getting a bit antsy at the tread depth. Wonder if anybody else has seen such rapid wear.”

Category by category

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

  1. 78

    Dry

    Primacy 4 +2
    80
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Professional tests (TWG score)–85
    Reviews found online8474
  2. 82

    Wet

    Discoverer AT3 4S +1
    81
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Professional tests (TWG score)–85
    Reviews found online8677
  3. 72

    Snow

    No comparison
    –
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Reviews found online73–
  4. 76

    Comfort

    Level
    76
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Professional tests (TWG score)–76
    Reviews found online8374
  5. 72

    Noise

    Discoverer AT3 4S +1
    71
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Professional tests (TWG score)–74
    Reviews found online81–
  6. 73

    Treadwear

    Primacy 4 +4
    77
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Professional tests (TWG score)7182
    Reviews found online7771
  7. 77

    Handling

    Discoverer AT3 4S +3
    74
    Why this score
    SourceDiscoverer AT3 4SPrimacy 4
    Reviews found online7774
Scores at a glance
Cooper Discoverer AT3 4S vs Michelin Primacy 4: scores by category (0–100)
CategoryCooper Discoverer AT3 4SMichelin Primacy 4
Relative Score 77 78
Dry 78 80
Wet 82 81
Snow 72 –
Comfort 76 76
Noise 72 71
Treadwear 73 77
Handling 77 74

Higher is better. The Relative Score follows your weights below; category scores do not change.

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Wet grip and treadwear start at “Important” — the two things buyers rank highest. Move the sliders and the scores update instantly.

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Neither tire has a score here yet, so this weight changes nothing.

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Recomputed
Headline score

Discoverer AT3 4S

Primacy 4

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

The professional test results behind the scores

Each result is shown as % of the best tire in that test. “Same test” rows are the strictest comparison: both tires were measured side by side.

DisciplineCategoryDiscoverer AT3 4SPrimacy 4ΔBoth?
Overall Ranking Overall 76% #5/18 · 2022 Consumer Reports All Terrain Truck Tires 100% #1/10 · 2020 Teknikens 17 Inch Summer Tyre Test −23.5 Different tests

Pros, cons & observations

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

Tire A Discoverer AT3 4S

Pros

  • Exceptionally quiet and smooth on-road ride compared to typical all-terrain tires
  • Superb traction in wet, rainy, and deep winter snow conditions
  • Strong value and competitive pricing relative to performance and lifespan

Cons

  • Potential for accelerated tread wear under heavy off-road use or demanding mountain driving
  • Occasional reports of balancing issues or out-of-round tires requiring multiple adjustments
  • Minor fuel economy drop or increased rolling resistance when switching from standard highway tires
All owner themes in the Discoverer AT3 4S review

Tire B Primacy 4

Pros

  • Exceptional tread life and long-lasting durability
  • Low road noise and a very quiet, comfortable ride
  • Reliable and consistent wet and dry grip

Cons

  • Vague, numb, or floaty steering feel with soft sidewalls under hard cornering
  • High price point compared to competitors
  • Occasional reports of increased road noise or harsher ride as the tread wears down
All owner themes in the Primacy 4 review

What real owners are saying

From Reddit, forums and review threads. Not part of our score

Tire A

Cooper Discoverer AT3 4S

Positive

The Cooper Discoverer AT3 4S is widely praised by the community for its quiet and comfortable highway ride, excellent wet and snow traction, and solid fuel efficiency. Drivers appreciate its balance of rugged aesthetics and daily drivability, though recent discussions highlight growing concerns over reported product discontinuations and sizing shortages.

Top themes
#Highway performance and low noise#Wet and snow traction#Tread wear and longevity#Availability and discontinuation rumors#Light off-road capability#Fuel economy and MPG

Based on 15 community posts

Tire B

Michelin Primacy 4

Positive

Community feedback for the Michelin Primacy 4 is largely positive, highlighting its excellent balance of low road noise, high comfort, dependable wet and dry grip, and strong longevity for daily driving. While some users note concerns over rapid wear on specific heavy or EV applications, and poor snow performance due to its summer tire nature, most drivers find it a superior touring tire compared to factory options.

r/TyreReviews ·3 upvotes ·2026-05-04

“6 year old MICHELIN PRIMACY 4(free) vs new Hankook Ventus prime 4 (290 eur) I currently have a set of Primacy 4 that still have thread and haven't given me any issues. (Dry or wet) . Do you guys think i should change them or will they be good for another year or so? I think they are ok but I've had someone say they're a bit old. Thanks”

r/nzev ·1 upvote ·2026-02-11

“Both our Polestar2 (new) and 2016 Leaf (Jap import) arrived with Primacy 4s on them. The FWD Polestar needed fronts replaced at ~35k km and being 245/45 R19s Primacy were too pricey so went with Kumho Ecsta PS71 equivalents for a lot cheaper and negligible difference in performance. The rears on the Polestar are still going strong at 45k km and look like at least 60k km will be likely. We also fitted Kumhos on our previous Leaf and were very satisfied with performance and life.”

r/AutomobileRO ·2 upvotes ·2025-09-22

“Am avut primacy 4 pe o electrica. Destul de dezamagit de faptul ca dupa ~ 28.000 km s-au tocit rau de au ajuns cam la 3 mm. Placute la condus, silentioase, dar nu cele mai aderente. Pilot sport 4 pe aceiasi electrica cu primacy 4. Huruie de te doare capul. Aderenta nu o simt neaparat wow fata de primacy 4. Nu le mai suport si abia astept sa le trec pe iarna, oricum asta fiind ultima incaltare cu ele. Pe o termica am primacy 5, si sunt cele mai ok din experienta mea. Cele mai silentioase si aderente din cele 3. Dupa 20.000 km uzura a scazut cam cu 1 mm. Recomandarea mea e sa alegi primacy 5 fara ezitare.”

Top themes
#Ride Comfort and Smoothness#Low Road Noise#Wet and Dry Grip#Tread Life and Longevity#Comparison with Pilot Sport 4#Winter and Snow Limitations

Based on 32 community posts

Specs side by side

Attribute A · Cooper Discoverer AT3 4S B · Michelin Primacy 4
CategoryAll SeasonSummer
Vehicle typeSUV and 4x4Passenger Car / Crossover
Sizes available1457
Rim diameters15″ – 22″15″ – 20″
Tread depth12 - 14/32″—
UTQG620 A B—
Treadwear warranty65,000 mi—
SidewallBlack Side Wall - Raised Outline White Lettering—
Max pressure44 - 50 psi—

Which one should you actually buy?

Cooper Discoverer AT3 4S

Michelin Primacy 4

Too close to call: Cooper Discoverer AT3 4S and Michelin Primacy 4 are within 2 points overall. Cooper Discoverer AT3 4S is stronger on handling. Michelin Primacy 4 is stronger on treadwear.

Pick tire B You want the longest tread life

Michelin Primacy 4 scores 77 vs 73 on treadwear.

Pick tire A You enjoy sharp, responsive handling

Cooper Discoverer AT3 4S scores 77 vs 74 on handling.

Tire A · Cooper Discoverer AT3 4S
Tire B · Michelin Primacy 4

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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.

Community buzz from Reddit and forums is shown for context only — it never changes the score.

78

Narrow edge

Primacy 4

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