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Cooper Discoverer AT3 4S vs Michelin Defender LTX M/S2 — Compared

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

Defender LTX M/S2 is ahead, 81–76

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Tire BMichelin

Defender LTX M/S2

Tests – · none yet Owners 87 · 3,650 reviews

“Tires 24 overtrail+ I'm at 20,000 miles now and need to change the stock tires that come with the overtrail +. I'm just looking for some recommendations, was thinking of getting the Michelin defender ltx m/s2 but wanted to see what other people were using. I do not off-road too much and do a lot of city and highway driving and when reading seems like the Michelin defender kind of fulfills what I need. Also, has anybody gone up a size and tires? I know the stock size is 265/70R18, but I was curious if anybody used a larger tire with the OEM wheels that come with it. I know the 24 is 1 inch shorter than the 25 and 26 so outcomes can be a little different. Appreciate anybody's experience they have dealt with. Thank you”

Category by category

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

  1. 78

    Dry

    Defender LTX M/S2 +4
    82
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Reviews found online8491
  2. 82

    Wet

    Defender LTX M/S2 +2
    84
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Reviews found online8689
  3. 72

    Snow

    Level
    72
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Reviews found online7474
  4. 76

    Comfort

    Defender LTX M/S2 +2
    78
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Reviews found online8387
  5. 72

    Noise

    Defender LTX M/S2 +4
    76
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Reviews found online8189
  6. 73

    Treadwear

    Defender LTX M/S2 +7
    80
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Professional tests (TWG score)71–
    Reviews found online7790
  7. 77

    Handling

    Defender LTX M/S2 +9
    86
    Why this score
    SourceDiscoverer AT3 4SDefender LTX M/S2
    Reviews found online7786
Scores at a glance
CategoryCooper Discoverer AT3 4SMichelin Defender LTX M/S2
Relative Score 76 81
Dry 78 82
Wet 82 84
Snow 72 72
Comfort 76 78
Noise 72 76
Treadwear 73 80
Handling 77 86

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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Headline score

Discoverer AT3 4S

Defender LTX M/S2

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 Defender LTX M/S2

Pros

  • Exceptionally long tread life and high mileage durability
  • Smooth, comfortable, and quiet highway ride quality
  • Improved fuel economy and low rolling resistance compared to factory or all-terrain tires

Cons

  • High upfront premium price point
  • Occasional minor wheel spin or reduced traction on wet surfaces during hard takeoffs
  • Treads can pack with snow, making them mediocre in deep winter conditions
All owner themes in the Defender LTX M/S2 review

What real owners are saying

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

Tire A

Cooper Discoverer AT3 4S

Positive

Community sentiment for the Cooper Discoverer AT3 4S is predominantly positive, with drivers praising its quiet highway ride, strong traction across snow, rain, and dry pavement, and appealing appearance. Several owners note that while it handles light off-road duties and daily driving well, tread life occasionally falls short of mileage expectations. In addition, multiple posts highlight frustration and concern regarding availability and recent discontinuation across various sizes.

r/3rdGen4Runner ·7 upvotes ·2021-07-25

“02 SR5 - New Cooper Discoverer AT3 4S P235/75R15 - beautiful tire - excellent handling/feel”
f150forum.com

“Quote: Originally Posted by ArizonaF1Fiddy I went with the Cooper Discoverer AT3 4s (275/65/18). The Michelin Primacy XC were on there when I purchased and they were terrible. I like the looks of the Coopers...the ride is much more controlled and a bit softer over broken surfaces. They do have some slip off the line of you give it full throttle real similar to the XCs. I was looking for an AT that would be great at hooking up in dry weather but probably not gong to find an AT that is sticky enough. They're brand-new so I'll give an update after a few hundred miles or so (I don't put a lot of miles so it'll take time). Thanks to the Forum for the info! This looks nice!”
r/4Runner ·2 upvotes ·2023-10-23

“Tire Question: Michelin Defenders or Cooper Discoverer AT3 4S I have a TRD ORP and want to replace the crappy stock Dunlops. Almost all my driving is on road so looking at the Michelin Defenders or the Cooper AT3 4S in the stock size. I prefer the looks of the coopers but am I going to notice any decrease in wet performance, road noise or mpg compared to the Michelins?”
Top themes
#Snow and wet traction#Quiet highway ride#Tread life and longevity#Discontinuation and availability#Comfortable ride quality#Mild off-road performance

Based on 27 community posts

Tire B

Michelin Defender LTX M/S2

Positive

The community widely views the Michelin Defender LTX M/S2 as an outstanding highway and daily driving tire, praising its smooth ride, low road noise, and reliable wet traction. While considered an ideal replacement for noisy all-terrain or OEM tires, some users question its performance in severe winter or deep mud conditions compared to dedicated off-road tires. A few owners also raised minor concerns regarding warranty differences, balancing, and tread life compared to prior generations.

r/tires ·1 upvote ·2025-12-12

“The Defender LTX M/S2s are the best tires I've ever run. They last forever. Great dry and wet traction. Quiet. Had them on a LR Disco and a fwd RX350z. Got around easily in ten inches of snow with the Lexus. I used to like Bridgestone but I've had better experiences with Michelins.”
r/RivianR2 ·1 upvote ·2026-09-06

“The Michelin Defender LTX m/s2 is available in 255/60/20 and is a fantastic tire. Not severe snow rated but it has a great reputation for being great in the snow. Lasts forever too.”
r/ToyotaTundra ·2 upvotes ·2026-01-18

“I have the same truck. I love my Defender LTX M/S2 tires. Very good on the rroadand in rain and snow. I haven't towed with them but have had no issues on forest service roads in Washington state. I would definitely get them again.”
Top themes
#highway ride comfort#wet weather traction#low road noise#fuel and range efficiency#light snow performance#all-terrain comparison

Based on 83 community posts

Specs side by side

Attribute A · Cooper Discoverer AT3 4S B · Michelin Defender LTX M/S2
CategoryAll Season—
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available141
Rim diameters15″ – 22″22″
Tread depth12 - 14/32″11 - 14/32″
UTQG620 A B820 B A
Treadwear warranty65,000 mi—
SidewallBlack Side Wall - Raised Outline White LetteringBlack Side Wall - Raised Outline White Lettering
Max pressure44 - 50 psi50 - 80 psi

Which one should you actually buy?

Cooper Discoverer AT3 4S

Michelin Defender LTX M/S2

Winner: Michelin Defender LTX M/S2 — better handling, treadwear and dry. It leads or ties in every category we score.

Pick tire B You enjoy sharp, responsive handling

Michelin Defender LTX M/S2 scores 86 vs 77 on handling.

Pick tire B You want the longest tread life

Michelin Defender LTX M/S2 scores 80 vs 73 on treadwear.

Pick tire B You want the most grip on dry roads

Michelin Defender LTX M/S2 scores 82 vs 78 on dry.

Pick tire B You want a quieter cabin

Michelin Defender LTX M/S2 scores 76 vs 72 on noise.

Tire A · Cooper Discoverer AT3 4S
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Tire B · Michelin Defender LTX M/S2
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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.

81

Leads

Defender LTX M/S2

Amazon