Tests – · none yet Owners 80 · 800 reviews
“Put some new tires on the XD today. Cooper Discoverer AT3 XLT in 275/70R18. I usually run BFG KO2s on my trucks but wanted to try something different this time.”
Head-to-head
Updated
Cooper Discoverer AT3 XLT vs Firestone Transforce AT — Compared
Relative Score (0–100): 60% professional tests, 40% owner reviews.
Discoverer AT3 XLT is ahead, 76–48
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Tests – · none yet Owners 39 · 26 reviews
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
-
78
Dry
Discoverer AT3 XLT +2949Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 84 39 -
80
Wet
Discoverer AT3 XLT +3446Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 84 37 -
70
Snow
Discoverer AT3 XLT +1555Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 70 45 -
74
Comfort
Discoverer AT3 XLT +2252Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 79 36 -
72
Noise
Discoverer AT3 XLT +1062Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 81 56 -
72
Treadwear
Discoverer AT3 XLT +2745Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 77 31 -
78
Handling
Discoverer AT3 XLT +3840Why this score
Source Discoverer AT3 XLT Transforce AT Reviews found online 78 40
Scores at a glance
| Category | Cooper Discoverer AT3 XLT | Firestone Transforce AT |
|---|---|---|
| Relative Score | 76 | 48 |
| Dry | 78 | 49 |
| Wet | 80 | 46 |
| Snow | 70 | 55 |
| Comfort | 74 | 52 |
| Noise | 72 | 62 |
| Treadwear | 72 | 45 |
| Handling | 78 | 40 |
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
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Neutral
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Less important
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Less important
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Important
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Neutral
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Recomputed
Headline score
76
/ 100
Discoverer AT3 XLT
48
/ 100
Transforce AT
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
Tire B Transforce AT
Not enough owner reviews yet to extract themes.
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Tire A
Positive
Cooper Discoverer AT3 XLT
Community members report high satisfaction with the Cooper Discoverer AT3 XLT, highlighting its quiet ride, long tread life, and strong winter performance. Several owners praise its smooth ride quality and durability under towing conditions compared to rival all-terrain tires. Discussion also commonly centers around sizing, fitment, and snow ratings.
r/ram_trucks
·27 upvotes ·2024-07-11
“Cooper Discoverer AT3 XLT Picked up a set of Discoverer AT3 XLT from simple tire. With the 4th of July discounts all 4 were under 1k before taxes. I had the AT3 4S on a previous ram and they held up so I’m expecting good things here.”
cumminsforum.com
·2024-08-31
“I figure any tire review is good, even if late. I'm nearing the end of use for Cooper Discoverer AT3 XLT in LT275/70R18E 125S on OE 18x8" chrome clad wheels. They have been fantastic tires , great in the snow, quiet, never felt like they were giving up any traction except for the fourth (last) winter, but they never felt dangerous. They wore dead flat across the tread, kept the fronts at 65# and rears at 75#, rotated about every 5k miles, used Thuren alignment specs. They made 50k miles (the warranty in 2020) no problem. I have no problem getting them again or recommending them, but I like trying something different. If the different tires I chose this time don't work out (45 days), I'll just get these Coopers again.”
f150forum.com
“Quote: Originally Posted by SodiumMonkey Thanks for the reply. I actually read through your entire build thread last night. Wow. Awesome stuff there. Im planning on keeping the OEM Platinum trim 20 wheels. So I could run the Discoverer AT3 XLT 275/65 R20 without any rub at all with either a 2 spacer level or something like this kit from Fox? I dont want to trim anything and dont want any rub even when suspension is flexed. It seems like most info online indicates a 33 tire is the max for a 2 level and no rubbing. I believe the 275/65 R20 is a 34 tire. Thanks for the advice! I only ever rubbed with my 285/65R20s when I was reversing and turning right down an angled driveway, on the street and flat ground it never rubbed. Offroad is where I had the most rubbing but that is expected. A 275/65R20 is what a lot of people run with only a 2 inch level. It fills the wheel wells nice and it will very rarely rub in any on road circumstance, no matter how you level the truck. A 33" tire is too small in my personal opinion.”
Top themes
#low road noise#tread longevity and wear#snow and winter traction#tire sizing and fitment#ride quality and comfort#towing performance
Based on 13 community posts
Tire B
Firestone Transforce AT
We haven't collected enough community discussion about this tire yet.
Specs side by side
| Attribute | A · Cooper Discoverer AT3 XLT | B · Firestone Transforce AT |
|---|---|---|
| Category | Premium Touring All Season tire | — |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 4 | 2 |
| Rim diameters | 16″ – 20″ | 17″ – 20″ |
| Tread depth | 16 - 18/32″ | 17/32″ |
| Treadwear warranty | 60,000 mi | — |
| Sidewall | Black Side Wall - Raised White Lettering | Blackwall |
| Max pressure | 35 - 80 psi | 80 psi |
Which one should you actually buy?
76
/ 100
Cooper Discoverer AT3 XLT
48
/ 100
Firestone Transforce AT
Winner: Cooper Discoverer AT3 XLT — better handling, wet and dry. It leads or ties in every category we score.
Pick tire A
You enjoy sharp, responsive handling
Cooper Discoverer AT3 XLT scores 78 vs 40 on handling.
Pick tire A
Your priority is wet-weather safety
Cooper Discoverer AT3 XLT scores 80 vs 46 on wet.
Pick tire A
You want the most grip on dry roads
Cooper Discoverer AT3 XLT scores 78 vs 49 on dry.
Pick tire A
You want the longest tread life
Cooper Discoverer AT3 XLT scores 72 vs 45 on treadwear.
Tire A · Cooper Discoverer AT3 XLT
Tire B · Firestone Transforce AT
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.