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Head-to-head Updated

Michelin Defender LTX M/S vs Cooper Discoverer AT3 XLT — Compared

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

Too close to call: Defender LTX M/S and Discoverer AT3 XLT are level at 76.

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Tire BCooper

Discoverer AT3 XLT

Premium Touring All Season tire

Tests – · none yet Owners 80 · 800 reviews

“I’ve run Hankook dynapro’s, BFG ko2, Nokian outpost nat, and fallen wild peaks. Currently running Cooper discoverer AT3 XLT - they are definitely the quietest all terrains I’ve had. I would recommend them if they are available in your size - many places like simpletire or priority tire carry them.”

Category by category

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

  1. 76

    Dry

    Discoverer AT3 XLT +2
    78
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Reviews found online8184
  2. 78

    Wet

    Discoverer AT3 XLT +2
    80
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Reviews found online8184
  3. 72

    Snow

    Defender LTX M/S +2
    70
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Reviews found online7370
  4. 73

    Comfort

    Discoverer AT3 XLT +1
    74
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Reviews found online7680
  5. 69

    Noise

    Discoverer AT3 XLT +3
    72
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Reviews found online7480
  6. 76

    Treadwear

    Defender LTX M/S +4
    72
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Professional tests (TWG score)74–
    Reviews found online7877
  7. 78

    Handling

    Level
    78
    Why this score
    SourceDefender LTX M/SDiscoverer AT3 XLT
    Reviews found online7878
Scores at a glance
CategoryMichelin Defender LTX M/SCooper Discoverer AT3 XLT
Relative Score 76 76
Dry 76 78
Wet 78 80
Snow 72 70
Comfort 73 74
Noise 69 72
Treadwear 76 72
Handling 78 78

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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Recomputed
Headline score

Defender LTX M/S

Discoverer AT3 XLT

Pros, cons & observations

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

Tire A Defender LTX M/S

Pros

  • Exceptional tread longevity and mileage lifespan
  • Quiet and smooth ride quality at highway speeds
  • Strong year-round traction across dry, wet, and light snow conditions

Cons

  • High upfront purchase price
  • Subpar performance in deep mud, sand, and off-road environments
  • Limited ice and severe winter capability compared to dedicated winter tires
All owner themes in the Defender LTX M/S review

Tire B Discoverer AT3 XLT

Pros

  • Significantly lower road noise than comparable aggressive all-terrain tires
  • Excellent wet weather, snow, and slush traction
  • Sturdy sidewalls and stable performance when towing heavy loads

Cons

  • Some users report difficulty with balancing, leading to vibrations or a rough ride
  • Tread life occasionally falls short of expectations for certain drivers
  • Can struggle or get gummed up in deep mud
All owner themes in the Discoverer AT3 XLT review

What real owners are saying

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

Tire A

Michelin Defender LTX M/S

We haven't collected enough community discussion about this tire yet.

Tire B

Cooper Discoverer AT3 XLT

Positive

Community opinion of the Cooper Discoverer AT3 XLT is overwhelmingly positive, with users frequently praising its smooth ride quality, exceptional quietness on the highway, and long-term durability compared to competitors like BFG KO2 and Toyo Open Country. Drivers also appreciate its solid value and performance when towing. A few users occasionally confuse the M+S marking with the Three-Peak Mountain Snowflake rating for severe winter conditions.

r/f150 ·51 upvotes ·2021-12-30

“New shoes this week, Cooper Discoverer At3 XLT. I’m really impressed so far.”
r/ram_trucks ·22 upvotes ·2021-11-19

“New Cooper Discoverer AT3 XLT 275/75R20 these ride way better than my old Open Country A/T II”
r/Trucks ·3 upvotes ·2021-03-26

“Are my Discoverer AT3 XLT snow rated? Going snowboarding and roads require snow tires or chains /cables. I was looking at the sidewall of my Cooper Discoverer XLT and saw there is a small M+S next to the tire size. Is it stupid to assume these are snow rated? I'm not trying to get a ticket for not having chains if I need them, which most places seem to be sold out locally.”
Top themes
#ride comfort#low road noise#tread longevity#winter and snow ratings#comparison to competitors#pricing and value#towing performance

Based on 8 community posts

Specs side by side

Attribute A · Michelin Defender LTX M/S B · Cooper Discoverer AT3 XLT
CategoryAll SeasonPremium Touring All Season tire
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available—4
Rim diameters—16″ – 20″
Tread depth—16 - 18/32″
Treadwear warranty—60,000 mi
Sidewall—Black Side Wall - Raised White Lettering
Max pressure—35 - 80 psi

Which one should you actually buy?

Michelin Defender LTX M/S

Cooper Discoverer AT3 XLT

Too close to call: Michelin Defender LTX M/S and Cooper Discoverer AT3 XLT are within 2 points overall. Michelin Defender LTX M/S is stronger on treadwear. Cooper Discoverer AT3 XLT is stronger on noise.

Pick tire A You want the longest tread life

Michelin Defender LTX M/S scores 76 vs 72 on treadwear.

Pick tire B You want a quieter cabin

Cooper Discoverer AT3 XLT scores 72 vs 69 on noise.

Tire A · Michelin Defender LTX M/S
Check price on Amazon
Tire B · Cooper Discoverer AT3 XLT
Check price on Amazon

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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.

76

Too close to call

Defender LTX M/S

Amazon