Head-to-head Updated

Cooper Discoverer STT PRO vs Nitto NT555 G2 — Compared

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

Discoverer STT PRO leads, 63–61 Narrow edge

Add your size for an exact match
/R

Both Amazon links then search this exact size.

TireWheelGuide may earn a commission from purchases made through these links.

Tire ACooper

Discoverer STT PRO

All Season

Tests – · none yet Owners 60 · 421 reviews

“I have them on my 12' 2500 with a Hemi work pickup. I have a little over 15,000 miles on them and they are holding up great. They are a little noisy on the pavement but they are a mud tread.”

Tire BNitto

NT555 G2

Summer

Tests 59 · 2 tests Owners 61 · 411 reviews

“It’s been about 8 months and about 17,000 miles or so. I have 120 miles total a day to work and back home. Tread depth is still plenty in the front and the rears aren’t bad either. I didn’t have a tread depth gauge on me for an accurate measure. The tires still grip very well through these cold, rainy days we’ve been having lately. Front left tire Front right tire. Rear right tire Rear left tire”

Category by category

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

  1. 65

    Dry

    Discoverer STT PRO +9
    56
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Professional tests (TWG score)–49
    Reviews found online6367
  2. 67

    Wet

    Discoverer STT PRO +15
    52
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Professional tests (TWG score)–48
    Reviews found online6659
  3. 66

    Snow

    Discoverer STT PRO +18
    48
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Reviews found online6434
  4. 61

    Comfort

    NT555 G2 +7
    68
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Reviews found online5267
  5. 54

    Noise

    NT555 G2 +12
    66
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Reviews found online3465
  6. 63

    Treadwear

    NT555 G2 +12
    75
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Professional tests (TWG score)–80
    Reviews found online6267
  7. 54

    Handling

    NT555 G2 +13
    67
    Why this score
    SourceDiscoverer STT PRONT555 G2
    Reviews found online5467
Scores at a glance
Cooper Discoverer STT PRO vs Nitto NT555 G2: scores by category (0–100)
CategoryCooper Discoverer STT PRONitto NT555 G2
Relative Score 63 61
Dry 65 56
Wet 67 52
Snow 66 48
Comfort 61 68
Noise 54 66
Treadwear 63 75
Handling 54 67

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

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.

Important
NoneLessNeutralMoreMost
Important
NoneLessNeutralMoreMost
Neutral
NoneLessNeutralMoreMost
Less important
NoneLessNeutralMoreMost
Less important
NoneLessNeutralMoreMost
Important
NoneLessNeutralMoreMost
Neutral
NoneLessNeutralMoreMost
Recomputed
Headline score

Discoverer STT PRO

NT555 G2

Pros, cons & observations

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

Tire A Discoverer STT PRO

Pros

  • Outstanding off-road traction in mud, rocks, and dirt
  • Surprisingly low road noise and smooth ride for a mud-terrain tire
  • Aggressive and appealing visual design with tough sidewalls

Cons

  • Can be difficult to balance properly, leading to vibrations for some users
  • Faster tread wear reported by a subset of drivers under heavy use
  • Reduced traction in specific conditions like deep sand or packed snow/ice
All owner themes in the Discoverer STT PRO 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 STT PRO

Positive

Community members widely praise the Cooper Discoverer STT PRO for its exceptional off-road traction, towing capability, and dependable handling in mud, rain, and snow. While users note it balances well and rides comfortably for a mud-terrain tire, the most common criticisms involve pavement road noise that increases with wear and concerns regarding tread life on heavy trucks.

Top themes
#off-road traction#highway road noise#mud and snow performance#tread wear life#heavy truck towing#balancing and ride quality

Based on 38 community posts

Tire B

Nitto NT555 G2

Mixed

Community sentiment regarding the Nitto NT555 G2 is divided, with many owners appreciating its affordable price point, quiet street ride, good tread life, and availability in hard-to-find wide sizes. However, numerous drivers express frustration over poor straight-line traction on higher-horsepower vehicles, significant loss of grip in cold temperatures, and dangerous handling or hydroplaning in wet weather. Additionally, several users report persistent issues with flat-spotting when vehicles are parked for extended periods.

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”

corvetteforum.com

“If you daily drive them, and the temps stay up (you are in Florida) you should be ok. As I have stated a bunch of times (as well as others) they flat spot quick. In my case 3 days. NTB replaced them for me, under warranty, customer satisfaction after less that 5000 miles. I will never own another Nitto tire again. Once they flat spot (in my experience, can't say for others) it will take 10 to 20 miles of driving to warm them up enough to go over 55 mph without severely shaking the car. I talked to Nitto and their BS response was to put the car on jackstands when it was not being driven. No care about the customer, no thought that they might not be the right tire for where I live with a car that is not driven daily. They should come with a set of those plastic blocks that help prevent flat spotting while keeping the tire round when it is parked, not being driven.”

r/Challenger ·40 upvotes ·2025-02-27

“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”

Top themes
#Wet traction issues#Cold weather performance#Affordable budget option#Straight line grip#Temporary flat spotting#Wide size availability#Michelin tire comparisons

Based on 84 community posts

Specs side by side

Attribute A · Cooper Discoverer STT PRO B · Nitto NT555 G2
CategoryAll SeasonSummer
Vehicle typeSUV and 4x4Passenger Car / Crossover
Sizes available2388
Rim diameters16″ – 20″15″ – 22″
Tread depth18 - 22/32″10.2/32″
UTQG—320 A A
SidewallBlack Side Wall - Raised White LetteringBlackwall
Max pressure35 - 80 psi50 psi

Which one should you actually buy?

Cooper Discoverer STT PRO

Nitto NT555 G2

Winner: Cooper Discoverer STT PRO — better snow, wet and dry. Pick the Nitto NT555 G2 if handling, noise and treadwear matter most to you.

Pick tire A You drive through snowy winters

Cooper Discoverer STT PRO scores 66 vs 48 on snow.

Pick tire A Your priority is wet-weather safety

Cooper Discoverer STT PRO scores 67 vs 52 on wet.

Pick tire B You enjoy sharp, responsive handling

Nitto NT555 G2 scores 67 vs 54 on handling.

Pick tire B You want a quieter cabin

Nitto NT555 G2 scores 66 vs 54 on noise.

Tire A · Cooper Discoverer STT PRO
Tire B · Nitto NT555 G2

TireWheelGuide may earn a commission from purchases made through these links.

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.

63

Narrow edge

Discoverer STT PRO

Amazon