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Cooper Discoverer AT3 XLT vs Nitto NT555 G2 — Compared

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

Discoverer AT3 XLT is ahead, 76–62

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Tire ACooper

Discoverer AT3 XLT

Premium Touring All Season tire

Tests – · none yet Owners 80 · 800 reviews

“New Cooper Discoverer AT3 XLT 275/75R20 these ride way better than my old Open Country A/T II”

Tire BNitto

NT555 G2

Summer

Tests 61 · 2 tests Owners 61 · 411 reviews

“Nitto NT555 G2 305/35/20 Just got my G2’s from American Muscle. 5% off and free shipping. Ready for that hot pavement of spring/summer. What summer tires you running? Read more”

Category by category

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

  1. 78

    Dry

    Discoverer AT3 XLT +20
    58
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Professional tests (TWG score)–52
    Reviews found online8467
  2. 80

    Wet

    Discoverer AT3 XLT +26
    54
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Professional tests (TWG score)–50
    Reviews found online8459
  3. 70

    Snow

    Discoverer AT3 XLT +22
    48
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Reviews found online7034
  4. 74

    Comfort

    Discoverer AT3 XLT +6
    68
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Reviews found online8067
  5. 72

    Noise

    Discoverer AT3 XLT +6
    66
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Reviews found online8065
  6. 72

    Treadwear

    NT555 G2 +3
    75
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Professional tests (TWG score)–80
    Reviews found online7767
  7. 78

    Handling

    Discoverer AT3 XLT +11
    67
    Why this score
    SourceDiscoverer AT3 XLTNT555 G2
    Reviews found online7867
Scores at a glance
CategoryCooper Discoverer AT3 XLTNitto NT555 G2
Relative Score 76 62
Dry 78 58
Wet 80 54
Snow 70 48
Comfort 74 68
Noise 72 66
Treadwear 72 75
Handling 78 67

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

Discoverer AT3 XLT

NT555 G2

Pros, cons & observations

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

Tire A 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

Tire B NT555 G2

Pros

  • Aggressive, visually appealing tread pattern and sidewall design
  • Exceptional value and lower price point compared to premium brands like Michelin or Pirelli
  • Long-lasting tread life and slow wear rates for a summer performance tire

Cons

  • Poor wet-weather traction, with multiple users reporting hydroplaning and a slippery feel in the rain
  • Lack of straight-line traction and wheel spin under heavy acceleration, especially on high-horsepower RWD vehicles
  • Subpar performance in cooler temperatures or cold conditions, requiring heat to grip properly
All owner themes in the NT555 G2 review

What real owners are saying

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

Tire A

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/Offroad ·1 upvote ·2025-10-02

“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.”
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

Tire B

Nitto NT555 G2

Mixed

Community opinions on the Nitto NT555 G2 are mixed, often positioning it as an affordable, good-looking tire with decent tread life that performs adequately in warm weather. However, many enthusiast drivers note that it struggles significantly with straight-line traction, wet weather grip, and cold temperatures compared to higher-end alternatives like the Michelin Pilot Sport 4S.

r/Autocross ·3 upvotes ·2021-06-21

“How to make the most of my nt555 g2s? Hey, I have 285 front 305 rear 20" 555 g2s on my Camaro 1LE and I'm really struggling at autocross. I find that my braking ability and front grip mid corner are aweful. I drove a friend's car on Better 200tw tire and loved out. How can I make the most of my G2? I ran 28psi last event. I'm not trying to win a class, just learning what I can. I plan on upgrading tires after I burn these but I don't want to drop 1400 on good tires until I need to since my car is not only used at Autocross. It's drag raced, autoXd, going to go to a road course, and I want to go to Canada and the tail of the Dragon lol. Yes, I know wheels/tires for the street and track Seperate would be the best idea Read more”
r/tires ·1 upvote ·2024-02-06

“i had some NT555 G2s on my bmw.. they are awesome tires but they DO NOT like to be cold.. if your area gets cold, id say under 60F do not drive aggressive until they warm up. they are a summer only tire.”
r/Mustang ·2 upvotes ·2021-02-02

“Nitto NT555 G2 is good for the price. It's decent all around. Great treadwear rating, looks good but does NOT want to perform at all if a little bit cold. MP4S if you don't mind spending extra. A bit more grippy and better in the rain for sure.”
Top themes
#straight-line traction#wet weather performance#cold temperature grip#price and value#treadwear and longevity#comparison to michelin ps4s

Based on 24 community posts

Specs side by side

Attribute A · Cooper Discoverer AT3 XLT B · Nitto NT555 G2
CategoryPremium Touring All Season tireSummer
Vehicle typeSUV and 4x4Passenger Car / Crossover
Sizes available488
Rim diameters16″ – 20″15″ – 22″
Tread depth16 - 18/32″10.2/32″
UTQG—320 A A
Treadwear warranty60,000 mi—
SidewallBlack Side Wall - Raised White LetteringBlackwall
Max pressure35 - 80 psi50 psi

Which one should you actually buy?

Cooper Discoverer AT3 XLT

Nitto NT555 G2

Winner: Cooper Discoverer AT3 XLT — better wet, snow and dry. Pick the Nitto NT555 G2 if treadwear matters most to you.

Pick tire A Your priority is wet-weather safety

Cooper Discoverer AT3 XLT scores 80 vs 54 on wet.

Pick tire A You drive through snowy winters

Cooper Discoverer AT3 XLT scores 70 vs 48 on snow.

Pick tire A You want the most grip on dry roads

Cooper Discoverer AT3 XLT scores 78 vs 58 on dry.

Pick tire A You enjoy sharp, responsive handling

Cooper Discoverer AT3 XLT scores 78 vs 67 on handling.

Tire A · Cooper Discoverer AT3 XLT
Check price on Amazon
Tire B · Nitto NT555 G2
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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

Leads

Discoverer AT3 XLT

Amazon