Tests – · none yet Owners 71 · 26 reviews
Head-to-head
Updated
Sumitomo Encounter AT vs Cooper Discoverer AT3 LT — Compared
Relative Score (0–100): the weighted average of the categories below, each 60% road tests and 40% owner reviews (comfort 40/60). Based on 0 + 0 road tests and 26 + 251 owner reviews. How we score
Discoverer AT3 LT is ahead, 78–71
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Tests – · none yet Owners 81 · 251 reviews
“I got 80k (rotating every 10k) out of Coopers on my 2010 and have 40k on current 2019 SL ... Discoverer AT3 LT ... they are designed for heavier trucks... excellent noise, excellent in water. I got stuck in a grass field in the factory HT hancocks... same field few years later with coopers.. no issues.. never tried in snow but imagine they would do well...”
Category by category
Relative Score per category, 0–100. Open “Why this score” for the tests and owner ratings behind it.
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73
Dry
Discoverer AT3 LT +780Why this score
Source Encounter AT Discoverer AT3 LT Professional tests (TWG score) ≈ 71 (est.) ≈ 76 (est.) Reviews found online 75 86 Encounter AT: 60% × 71 (est.) + 40% × 75 = 73
Discoverer AT3 LT: 60% × 75.8 (est.) + 40% × 86.3 = 80
No road tests of dry for Encounter AT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
No road tests of dry for Discoverer AT3 LT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.42).
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75
Wet
Discoverer AT3 LT +782Why this score
Source Encounter AT Discoverer AT3 LT Professional tests (TWG score) ≈ 74 (est.) ≈ 79 (est.) Reviews found online 77 86 Encounter AT: 60% × 74.3 (est.) + 40% × 77.2 = 75
Discoverer AT3 LT: 60% × 79.1 (est.) + 40% × 85.8 = 82
No road tests of wet for Encounter AT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
No road tests of wet for Discoverer AT3 LT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.55).
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68
Snow
Discoverer AT3 LT +674Why this score
Source Encounter AT Discoverer AT3 LT Professional tests (TWG score) ≈ 69 (est.) ≈ 73 (est.) Reviews found online 66 77 Encounter AT: 60% × 69.1 (est.) + 40% × 66.2 = 68
Discoverer AT3 LT: 60% × 73 (est.) + 40% × 76.6 = 74
No road tests of snow for Encounter AT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
No road tests of snow for Discoverer AT3 LT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.37).
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67
Comfort
Discoverer AT3 LT +774Why this score
Source Encounter AT Discoverer AT3 LT Professional tests (TWG score) ≈ 69 (est.) ≈ 70 (est.) Reviews found online 66 77 Encounter AT: 40% × 68.6 (est.) + 60% × 66.4 = 67
Discoverer AT3 LT: 40% × 70.5 (est.) + 60% × 76.6 = 74
No road tests of comfort for Encounter AT or Discoverer AT3 LT. The test half is the tested tires’ average (69): owners’ comfort ratings barely follow the road tests.
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67
Noise
Discoverer AT3 LT +572Why this score
Source Encounter AT Discoverer AT3 LT Professional tests (TWG score) ≈ 67 (est.) ≈ 67 (est.) Reviews found online 68 81 Encounter AT: 60% × 66.6 (est.) + 40% × 68.2 = 67
Discoverer AT3 LT: 60% × 66.6 (est.) + 40% × 80.5 = 72
No road tests of noise for Encounter AT or Discoverer AT3 LT. The test half is the tested tires’ average (67): owners’ noise ratings barely follow the road tests.
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66
Treadwear
Discoverer AT3 LT +874Why this score
Source Encounter AT Discoverer AT3 LT Professional tests (TWG score) ≈ 66 (est.) ≈ 71 (est.) Reviews found online 66 79 Encounter AT: 60% × 66 (est.) + 40% × 65.8 = 66
Discoverer AT3 LT: 60% × 70.6 (est.) + 40% × 78.8 = 74
No road tests of treadwear for Encounter AT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
No road tests of treadwear for Discoverer AT3 LT. The test half is estimated from the owner ratings, as far as owners and testers agree (correlation 0.35).
-
–
Handling (owners)
No comparison71Why this score
Source Encounter AT Discoverer AT3 LT Reviews found online – 71
Scores at a glance
| Category | Sumitomo Encounter AT | Cooper Discoverer AT3 LT |
|---|---|---|
| Relative Score | 71 | 78 |
| Dry | 73 | 80 |
| Wet | 75 | 82 |
| Snow | 68 | 74 |
| Comfort | 67 | 74 |
| Noise | 67 | 72 |
| Treadwear | 66 | 74 |
| Handling (owners) | – | 71 |
Higher is better. The Relative Score follows your weights below; category scores do not change.
Weight the categories that matter to you
Wet grip starts at “Important”. Treadwear starts at “Neutral” here: road tests measured it for at most one of the two tires, so it rests on owner reviews. Move the sliders and the scores update instantly.
Important
NotLessNeutralImportantMost
Important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Neutral
NotLessNeutralImportantMost
Less important
NotLessNeutralImportantMost
Only one of the two tires has a score here, so this weight changes nothing in the head-to-head.
Recomputed
Headline score
71
/ 100
Encounter AT
78
/ 100
Discoverer AT3 LT
Only categories both tires have data for count toward the headline score.
Pros, cons & observations
Themes extracted from owner reviews found online — not the opinion of TireWheelGuide.
Tire A Encounter AT
Pros
- Smooth and exceptionally quiet on-road ride
- Great value and attractive price point
- Aggressive, appealing sidewall and tread design
Cons
- Polarizing winter and snow performance despite the 3PMSF rating
- Inadequate mud-clearing ability in heavy or sloppy conditions
- Occasional balancing difficulties reported by some users
Tire B Discoverer AT3 LT
Pros
- Excellent towing stability with minimal sidewall flex under heavy loads
- Surprisingly quiet and smooth on the highway for an all-terrain tire
- Strong durability and wear resistance on rough gravel, rock, and dirt roads
Cons
- Subpar performance in heavy snow, ice, or deep mud for some users
- Occasional reports of balancing difficulties or initial cold-weather tire thumping
- Isolated incidents of sidewall splitting or premature wear
What real owners are saying
From Reddit, forums and review threads. Not part of our score
Tire A
Sumitomo Encounter AT
We haven't collected enough community discussion about this tire yet.
Tire B
Mixed
Cooper Discoverer AT3 LT
Community sentiment regarding the Cooper Discoverer AT3 LT is mixed with a positive lean. Drivers appreciate its wet and snow traction, low noise, and strong tread life under heavy loads, though some report irregular wear and persistent balancing or vibration issues after accumulating mileage.
clubfrontier.org
·2 upvotes ·2023-02-26
“I got 80k (rotating every 10k) out of Coopers on my 2010 and have 40k on current 2019 SL ... Discoverer AT3 LT ... they are designed for heavier trucks... excellent noise, excellent in water. I got stuck in a grass field in the factory HT hancocks... same field few years later with coopers.. no issues.. never tried in snow but imagine they would do well...”
hdrams.com
·1 upvote ·2026-01-17
“I ran a set of 295/70r18 Discoverer AT3 LT’s for about 25k miles. I had seen lots of negative reviews but figured that I would be OK with them for my needs ( I drive in snow 4 - 5 times per year). Initially I was happy with the tires as they performed well in the snow and the rain but after 10k miles they developed a balance issue and started to wear irregularly. I had never experienced anything like it before. I actually purchased new shocks but never installed them. As I drive a lot of miles I just never had any time to deal with chasing the vibration / balance issue and just replaced the tires with Bridgestone Dueler AT Ascent. I now have about 20k miles on the Bridgestone’s and they are still ride very smooth and are wearing great.”
wanderthewest.com
·2020-07-08
“I have the Cooper Discoverer AT3 LT tires on my 2010 Tundra with Hawk. They are E series tires. Found this link that discusses the differences between the LT and XLT. Really like my LT's. The increased tire mileage would probably be a good thing of the price difference isn't too great. Paul”
Top themes
#Wet traction performance#Treadwear and longevity#Heavy load handling#Balancing and vibration#Snow traction capability
Based on 5 community posts
Specs side by side
| Attribute | A · Sumitomo Encounter AT | B · Cooper Discoverer AT3 LT |
|---|---|---|
| Category | All-Terrain tire | All-Terrain tire |
| Vehicle type | SUV and 4x4 | SUV and 4x4 |
| Sizes available | 15 | 14 |
| Rim diameters | 16″ – 20″ | 16″ – 18″ |
| Tread depth | 13/32″ | 16 - 17/32″ |
| UTQG | 660 A B | — |
| Treadwear warranty | 60,000 mi | 60,000 mi |
| Sidewall | Blackwall | Black Side Wall - Raised Outline White Lettering |
| Max pressure | 51 psi | 50 - 80 psi |
| Sizes in common | 1 | 1 |
Which one should you actually buy?
71
/ 100
Sumitomo Encounter AT
78
/ 100
Cooper Discoverer AT3 LT
Winner: Cooper Discoverer AT3 LT — better treadwear, dry and wet. It leads or ties in every category we score.
Pick tire B
You want the longest tread life
Cooper Discoverer AT3 LT scores 74 vs 66 on treadwear.
Pick tire B
You want the most grip on dry roads
Cooper Discoverer AT3 LT scores 80 vs 73 on dry.
Pick tire B
Your priority is wet-weather safety
Cooper Discoverer AT3 LT scores 82 vs 75 on wet.
Pick tire B
You want the most comfortable ride
Cooper Discoverer AT3 LT scores 74 vs 67 on comfort.
Tire A · Sumitomo Encounter AT
Tire B · Cooper Discoverer AT3 LT
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Encounter AT or Discoverer AT3 LT?
Which is better in the wet, Encounter AT or Discoverer AT3 LT?
Cooper Discoverer AT3 LT, 82 vs 75 on our wet score.
Which grips better on dry roads, Encounter AT or Discoverer AT3 LT?
Cooper Discoverer AT3 LT, 80 vs 73 on our dry score.
Which is better in snow, Encounter AT or Discoverer AT3 LT?
Cooper Discoverer AT3 LT, 74 vs 68 on our snow score.
Which is quieter, Encounter AT or Discoverer AT3 LT?
Cooper Discoverer AT3 LT, 72 vs 67 on our noise score.
Which is more comfortable, Encounter AT or Discoverer AT3 LT?
Cooper Discoverer AT3 LT, 74 vs 67 on our comfort score.
Which lasts longer, Encounter AT or Discoverer AT3 LT?
Cooper Discoverer AT3 LT, 74 vs 66 on our treadwear score.
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.
Handling is the exception: road tests measure it inside the dry and wet scores, so its own row comes from owner ratings only and starts as less important.
Community buzz from Reddit and forums is shown for context only — it never changes the score. Full methodology