Discoverer AT3 XLT™

Fits Trucks/Pickups All-Season

Discoverer AT3 XLT™ is rated 4.7 out of 5 by 43.
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Standard Limited Warranty
Free 45-Day Road Test
96,000 km Treadwear Protection - LT-Metric Sizes


The Discoverer AT3 XLT™ with Durable Tread Technology™ haul heavy loads with less wear and are built to withstand ongoing assault from dirt and gravel.

  • Designed to prevent shredding on rocky and gravel terrain
  • Extreme durability for hauling
  • Rugged, biting edges on the shoulder of the tire, for extra grip and resistance to punctures
  • Stops on average at least 10 feet shorter on wet roads*


Dry Performance

The tire’s ability to grip the road in dry conditions.

Wet Performance

The tire’s ability to grip the road in wet conditions.

Tread Wear

The wear rate of the tire.

Quiet Ride

The measure of how quiet a tire is while driving.


How the tire is able to respond to driving such as accelerating, braking, steering and turning.

Off Road

The tire’s ability to have grip on unpaved surfaces such as dirt, mud, sand, rock or gravel.

*When compared to other Cooper® tires.

Tire Design

  • Even Wear Arc Technology™

    Tire shape engineered to strategically balance pressure at the tire-to-road contact area promoting even on-road treadwear and superior handling.

  • Whisper Grooves™

    The "Whisper Groove™" provides a sound barrier that reduces road noise.

  • Rugged Traction Shoulders

    Rugged traction shoulders provide increased off-road traction for boulder crawling and mud handling as well as additional resistance to abrasion and punctures.

  • Stone Ejector Ledges

    Ledges easily eject stones and gravel, protecting the tire from stones drilling into carcass and maintaining a clean tread for enhanced road traction.

Full Specs

Tire Size Service Description UTQG Load Range Sidewall Approved Rim Width Measured Rim Width Section Width Overall Diameter Tread Width Tire Weight Max Load Tread Depth (1/32")
31X10.50R15LT 109R C RWL 7 - 9 8.5 10.6 30.2 8.31 44 2270 16.5
32X11.50R15LT 113R C RWL 8 - 10 9 11.6 31.42 9.09 48 2535 17
33X12.50R15LT 108R C RWL 8.5 - 11 10 12.6 32.36 9.69 54 2205 17
LT285/75R16 126\123R E RWL 7.5 - 9 8 11.6 32.56 8.9 54 3750 17
LT295/75R16 128\125R E RWL 7.5 - 9.5 8 11.9 33.35 9.21 58 3970 17
LT315/75R16 127\0R E RWL 8 - 11 8.5 12.4 34.49 9.8 64 3860 17
LT305/70R16 124\121R E RWL 8 - 9.5 9 12.2 32.72 9.69 57 3525 17
LT285/75R17 121\118S E BLK 7.5 - 9.5 8 11.5 33.82 8.9 58 3195 17
LT285/70R17 121\118S E RWL 7.5 - 9 8.5 11.4 32.83 9.09 56 3195 17
LT295/70R17 121\118R E RWL 7.5 - 10 8.5 11.9 33.35 9.41 58 3195 17
LT305/70R17 121\118R E BLK 8 - 9.5 9 12.2 33.86 9.8 61 3195 17
LT315/70R17 121\118S E RWL 8 - 11 9.5 12.6 34.33 10 64 3195 17
37X12.50R17LT 124R D BLK 8.5 - 11 10 12.5 36.54 10 68 3525 18
LT285/75R18 129\126S E BLK 7.5 - 9.5 8 11.5 34.84 8.9 60 4080 17
LT265/70R18 124\121S E RWL 7 - 9 8 10.7 32.64 8.62 53 3525 16.5
LT275/70R18 125\122S E RWL 7 - 8.5 8 11.1 33.23 8.9 57 3640 16
LT295/70R18 129\126S E BLK 7.5 - 10 8.5 12 34.25 9.41 61 4080 17
LT285/65R18 125\122S E RWL 8 - 10 8.5 11.6 32.56 9.41 57 3640 16
LT305/65R18 124\121S E BLK 8.5 - 11 9 12.2 33.58 10 62 3525 16.5
LT325/65R18 127\124R E RWL 9 - 12 9.5 13 34.61 10.59 68 3860 16.5
LT325/60R18 124\121R E BLK 9 - 12 9.5 13 33.35 10.63 63 3525 16.5
35X12.50R18LT 123R E BLK 8.5 - 11 10 12.5 34.96 9.88 66 3415 16.5
LT275/65R20 126\123S E RWL 7.5 - 9.5 8 11.1 34.21 8.9 61 3750 16
LT285/65R20 127\124S E RWL 8 - 10 8.5 11.5 34.57 9.69 62 3860 16
LT265/60R20 121\118R E BLK 7.5 - 9.5 8 10.7 32.52 8.78 57 3195 16
LT275/60R20 123\120S E BLK 7.5 - 9.5 8 11 32.99 8.9 57 3415 16
LT285/60R20 125\122S E BLK 8 - 10 8.5 11.3 33.7 9.69 60 3640 16
LT295/60R20 126\123S E BLK 8 - 10 8.5 11.5 34.13 9.72 61 3750 16.5
LT325/60R20 126\123R E RWL 9 - 12 9.5 13 35.35 10.59 70 3750 16.5
LT275/55R20 120\117S E BLK 7.5 - 9.5 8.5 11.2 31.89 8.9 55 3085 16
LT285/55R20 122\119R E BLK 8 - 10 9 11.7 32.36 9.69 59 3305 16
LT305/55R20 121\118S E BLK 8.5 - 11 9.5 12.2 33.35 10.31 62 3195 16
35X12.50R20LT 121R E BLK 8.5 - 11 10 12.5 34.65 10 66 3195 16.5


Rated 1 out of 5 by from Different tire with the same results. Let me start off by saying I've run Coopers for years and until 3 sets ago was happy with them. These tires are the third set of Coopers in a row that I've purchased and had balance issues with specifically Very high radial force variation. My first set on this truck were AT3's in size LT 2756018, I work as a technician for a Chevy dealer and the tires are mounted on a Silverado 2500HD with a diesel engine. That set wasn't to bad for the initial balance but would never stay balanced even after using multiple GM dealer equipment Hunter GEN 3 road force balancers. When I did measure the road force variation I found 2 of the 4 tires were way high on road force. ( 1 was 60lbs and the other 73lbs, I measured the wheels for runout and found none, tried to matchmount them but they only lost around 5 lbs of roadforce. Ran those till they wore out with vibration the whole time, Next set were Discoverer ATP's which I had to buy at discount tire online. Initial balance on every wheel was a lot of weight ( around 6 ounces or more per tire). Truck had vibration just as bad or worse than before, drove the tires several thousand miles before measuring the road force variation and again found 2 of 4 tires road force off the charts. First was 75lbs and second 120lbs. Emailed cooper about them and was told to call discount tire, got nowhere there and just gave up and drove the vibrating truck another 38k till they wore out. Now like a dummy I bought a set of AT3 XLT's and again have vibration and again checked the tires after driving several thousand miles and found 1 tire with a whopping 130lbs of road force. Called Cooper and was told to call where I bought them, All I know is I'm done with this company after years of using them on both our vehicles and cannot recommend them anymore.
Date published: 2019-07-15
Rated 5 out of 5 by from So quiet.. I bought these tires today, and I thought the air pressures had to be off. Rides so smoothly and quiet. On a F350. Amazingly the pressures were dead on. I don’t get off road much, went to the tire shop with the intent of downgrading to more of a highway tire from my previous at3’s. These tires were the same money with 10,000 miles more warranty. I never thought this truck would float like a Buick. Amazing.
Date published: 2019-06-25
Rated 5 out of 5 by from Wow, just wow. Running some 295/60 20 on a stock height ram eco diesel 2016. lets just say the tires out-perform stock tires like crazy. Its just amazing how the tires ride. This tire is so aggressive looking that I will never buy a different tire for now on for this truck. The ride is stupid quiet that its unbelievable. I don't sound like a tank coming down the road. The stopping performance on a rainy day is unreal. I had to slam on my brakes on an occasion and I was shocked to see how quicker the truck stoped vs my stock ones. the tire itself is great, no more worried about the wife hitting the curb as they take the punches like a champ. Crawling on rocky roads is no match, the tire withstands punctures very well that I don't worry about where I go anymore. The tires do catch on some rocks so get some mud flaps. Overall the tire is great but I can't say much about thread wear for now as I only had them for maybe 2k miles. I want to thank Mr Ali at USA tires in Woodland California for not trying to up sell me but for simply letting me know how great of a product COOPERTIRES makes. I purchased the tires based on his knowledge and I am sold because he is right on this set of outstanding tires. Thank you.
Date published: 2019-06-22
Rated 5 out of 5 by from Highly Recommend and Look Great These are great tires for the person who wants the look in a comfortable ride tire that occasionally goes off the beaten path. I like these tires so much that I bought a brand new truck and had my old pair of tires put on my new truck.I wish Cooper would make it in a 37x12.50r20
Date published: 2019-06-11
Rated 5 out of 5 by from Great tire so far 35x12.5-18 put on my Dodge Ram 3500. I had the SST mud tires on it but got tired of them making so much noise plus they road really hard. Put on these AT3 XLT and what a difference. Nice and QUIET plus truck rides a lot better. It's still a 1-ton truck and E-rated tire but it made a lot of difference. Drives nice....use truck to tow a fifth wheel camper no problems. Happy I got them. Will see how they hold up.
Date published: 2019-06-07
Rated 5 out of 5 by from Great Heavy Duty Tire Great traction. Quiet ride. Confident handling on wet pavement. That’s nice considering they look good too. Best highway biased all-terrain tire I could find. I needed something with great road manners and wet traction here in Houston. I regularly visit construction sites, enjoy the outdoors and log a lot of miles on various road surfaces. The 10-ply was the right choice for me. Pros: traction in wet/dry environments, smooth and quiet ride, look great Cons: above average weight for this size 10-ply tire This review is after a couple hundred miles. Will update after an oil change and rotation.
Date published: 2019-06-06
Rated 5 out of 5 by from Best truck tire on the market. Fire Department tough! Best truck tire yet in the Cooper lineup. I have had ATP and AT3, which are outstanding, but Cooper went to the moon with the XLT.
Date published: 2019-05-11
Rated 4 out of 5 by from After lots of research Currently I drive a 2012 Ram 3500 single rear wheel Crew Cab 4x4 Diesel. After countless hours of research and numerous contacts with Cooper Tires I had it down to the Falken AT3W and CoooerAT3 XLT. I finally pulled the trigger and went with the Cooper's. I had good experiences with their STT tires on my old 1500. They offered a great mileage warranty on the XLT tires. I do Search and Rescue with my truck in the Mojave Desert of Southern California. So I need s reliable tire both on and off the road. I believe these tires will deliver. So far they have awesome on road and highway manners. We have had recent rain so I got to test them out in the desert in both wet and dry conditions. All I need now is time to tow my travel trailer and see how well the tread holds up. The mist I've gotten from any tire was 42000 miles. This Ram weighs 8500# so I not time will tell how they hold up. I have high expectations and will update in about 20000 miles
Date published: 2019-05-11
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Standard Limited Warranty
Free 45-Day Road Test
96,000 km Treadwear Protection - LT-Metric Sizes

Download the 2019 Consumer Replacement Tire Guide, Limited Warranty & Registration Booklet.


  • 70

    Discoverer AT3 XLT™

  • Wet stopping distance as compared to leading LT-denoted all-terrain tires reviewed on well-known consumer ratings sites. Individual on-road results may vary.