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Head-to-head Updated May 2026

Cooper Discoverer AT3 LT vs Michelin Latitude Diamaris — Compared (May 2026)

Our Relative Score blends 60% objective test data with 40% owner-review signal — so any two tires can be compared even if they were never tested on the same day.

Tire A Cooper

Cooper Discoverer AT3 LT

Premium Touring All Season tire

Cooper Discoverer AT3 LT tread pattern
Objective (60%)
–/100
No test data yet
User signal (40%)
94/100
191 owner reviews
Dry
97
Wet
95
Snow
91
Comfort
94
Noise
92
Treadwear
93
Handling
94
Check price on Amazon

Prices change daily — check the retailer for your size.

VS
Tire B Michelin

Michelin Latitude Diamaris

Summer Ultra High Performance tires

Michelin Latitude Diamaris tread pattern
Objective (60%)
–/100
No test data yet
User signal (40%)
78/100
5 owner reviews
Dry
95
Wet
75
Snow
–
Comfort
85
Noise
–
Treadwear
85
Handling
77
Check price on Amazon

Prices change daily — check the retailer for your size.

VerdictWinner: Cooper Discoverer AT3 LT — better wet, handling and comfort. It leads or ties in every category we score.
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Category breakdown

7 categories, side by side

Each bar is the Relative Score for that category. Expand a tile to see the test results and owner ratings behind it.

Dry

Weight: Neutral
Score (0–100) Discoverer AT3 LT leads by 2
A
97
B
95
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
Tyre Reviews owners 85 95
SimpleTire owners 100 –
America's Tire owners 97 –

Wet

Weight: Important
Score (0–100) Discoverer AT3 LT leads by 20
A
95
B
75
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
Tyre Reviews owners 85 75
SimpleTire owners 95 –
America's Tire owners 94 –

Snow

Weight: Neutral
Score (0–100)
A
91
B
–
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
Tyre Reviews owners 90 –
SimpleTire owners 93 –

Comfort

Weight: Neutral
Score (0–100) Discoverer AT3 LT leads by 9
A
94
B
85
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
Tyre Reviews owners 75 85
SimpleTire owners 95 –
America's Tire owners 94 –

Noise

Weight: Neutral
Score (0–100)
A
92
B
–
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
SimpleTire owners 93 –
America's Tire owners 92 –

Treadwear

Weight: Important
Score (0–100) Discoverer AT3 LT leads by 8
A
93
B
85
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
Tyre Reviews owners 40 85
SimpleTire owners 100 –
America's Tire owners 93 –

Handling

Weight: Neutral
Score (0–100) Discoverer AT3 LT leads by 17
A
94
B
77
Why this score
SourceDiscoverer AT3 LTLatitude Diamaris
Tyre Reviews owners 45 77
America's Tire owners 94 –

Scores at a glance

CategoryCooper Discoverer AT3 LTMichelin Latitude Diamaris
Relative Score 94 83
Dry 97 95
Wet 95 75
Snow 91 –
Comfort 94 85
Noise 92 –
Treadwear 93 85
Handling 94 77

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

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Weight the categories that matter to you

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

Neutral
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Recomputed
Headline score

Tire A

Tire B

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

From owners

Pros, cons & observations

Themes extracted from owner reviews across retailers and review sites — not the opinion of TireWheelGuide.

Tire A Cooper Discoverer AT3 LT

Not enough owner reviews yet to extract themes.

Tire B Michelin Latitude Diamaris

The Michelin Latitude Diamaris is widely regarded for its exceptional tread longevity and fuel efficiency, particularly when fitted to luxury SUVs like the BMW X5. While users praise its dry-weather performance and quiet ride, opinions on wet-weather traction are polarized, with some drivers reporting concerns regarding hydroplaning in standing water.

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
  • Quiet and comfortable ride quality

Cons

  • Inconsistent wet-weather performance and susceptibility to hydroplaning
  • Poor traction in snow and icy conditions
  • High initial purchase price
  • Traction control intervention reported in standing water

Observations

  • BMW X5 owners consistently report high mileage figures, often exceeding 40,000 miles per set.
  • Users suggest that the wide tire profiles (e.g., 275mm) may contribute to increased hydroplaning risks in deep standing water.
Specifications

Specs side by side

Attribute A · Cooper Discoverer AT3 LT B · Michelin Latitude Diamaris
CategoryPremium Touring All Season tireSummer Ultra High Performance tires
Vehicle typeSUV and 4x4SUV and 4x4
Sizes available9—
Rim diameters16″ – 18″—
Tread depth16 - 17/32″—
Treadwear warranty60,000 mi—
SidewallBlack Side Wall - Raised Outline White Lettering—
Max pressure50 - 80 psi—
Final verdict

Which one should you actually buy?

Cooper

Michelin

Winner: Cooper Discoverer AT3 LT — better wet, handling and comfort. It leads or ties in every category we score.

Pick tire A Your priority is wet-weather safety

Cooper Discoverer AT3 LT scores 95 vs 75 on wet.

Pick tire A You enjoy sharp, responsive handling

Cooper Discoverer AT3 LT scores 94 vs 77 on handling.

Pick tire A You want the most comfortable ride

Cooper Discoverer AT3 LT scores 94 vs 85 on comfort.

Pick tire A You want the longest tread life

Cooper Discoverer AT3 LT scores 93 vs 85 on treadwear.

Tire A · Cooper Discoverer AT3 LT
Check price on Amazon
Tire B · Michelin Latitude Diamaris
Check price on Amazon

How do we compare tires?

Every category score blends two independent signals. 60% comes from professional tire tests (braking distances, lap times, noise measurements) normalized against the best tire in each test and weighted toward recent tests. 40% comes from thousands of owner reviews collected from retailers and review sites. When a tire has only one of the two, we use what exists and say so.

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