Discoverer AT3 4S™

Fits SUVs/CUVs and Trucks/Pickups All-Season

Discoverer A/T3 4S™ is rated 4.8 out of 5 by 30.
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Standard Limited Warranty
Free 45-Day Road Test
105,000 km Treadwear Protection - Euro-Metric Sizes

 

The Discoverer AT3 4S™ with Adaptive-Traction Technology grips the surface, rocky or smooth, under the most severe weather, hot or cold, wet or dry.

  • On road comfort with off-road durability
  • Maximum grip and handling on wet roads
  • Stops on average over 20 feet shorter on snow*

Severe Weather Rated

Features

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.

Handling

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

  • Snow Groove Technology

    Patented saw-tooth technology traps snow in the tread to provide superior snow-on-snow traction.

  • Aqua Vac™ Channels

    Uniquely shaped, deep center grooves improve the tire's resistance to hydroplaning.

  • Secure-Grip™ All-Terrain Design

    Specially designed 5-rib all-terrain pattern provides greater off-road driving capability and improved wet/dry traction.

  • Micro-Gauge™ Zigzag Sipes

    Smaller gauge sipes in all tread blocks provide increased vehicle stability and control, while reducing stone retention and drilling. Zigzags create more biting edges for optimal wet/dry 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")
235/75R15 109T 620 A B XL OWL 6 - 8 6.5 9.3 28.74 6.73 34 2271 14
235/75R15 105T 620 A B STD OWL 6 - 8 6.5 9.3 28.74 6.73 31 2039 14
265/75R15 112T 620 A B STD OWL 7 - 9 7.5 10.5 30.55 7.72 39 2469 14
225/70R15 100T 620 A B STD OWL 6 - 7.5 6.5 9 27.68 6.97 31 1764 13.5
255/70R15 108T 620 A B STD OWL 6.5 - 8.5 7.5 10.3 29.09 7.95 38 2205 14
265/70R15 112T 620 A B STD OWL 7 - 9 8 10.9 29.65 8.27 39 2469 14
225/75R16 104T 620 A B STD OWL 6 - 7.5 6 8.6 29.13 6.38 30 1984 13.5
235/75R16 108T 620 A B STD OWL 6 - 8 6.5 9.3 29.72 6.73 33 2205 14
245/75R16 111T 620 A B STD OWL 6.5 - 8 7 9.6 30.31 7.05 37 2403 14
265/75R16 116T 620 A B STD OWL 7 - 9 7.5 10.5 31.57 7.72 41 2756 14
215/70R16 100T 620 A B STD OWL 5.5 - 7 6.5 8.7 27.72 6.89 30 1764 13.5
225/70R16 103T 620 A B STD OWL 6 - 7.5 6.5 9 28.66 6.97 32 1929 13.5
235/70R16 106T 620 A B STD OWL 6 - 8 7 9.4 28.82 7.4 34 2094 13.5
245/70R16 111T 620 A B XL OWL 6.5 - 8 7 9.8 29.45 7.64 36 2403 13.5
245/70R16 107T 620 A B STD OWL 6.5 - 8 7 9.8 29.45 7.64 36 2149 13.5
255/70R16 111T 620 A B STD OWL 6.5 - 8.5 7.5 10.2 30.04 7.95 38 2403 14
265/70R16 112T 620 A B STD OWL 7 - 9 8 10.8 30.39 8.27 42 2469 14
235/75R17 109T 620 A B STD OWL 6 - 8 6.5 9.3 30.75 6.85 35 2271 14
255/75R17 115T 620 A B STD OWL 6.5 - 8.5 7 10 31.97 7.44 39 2679 14
235/70R17 109T 620 A B XL OWL 6 - 8 7 9.5 30 7.44 37 2271 13.5
245/70R17 110T 620 A B STD OWL 6.5 - 8 7 9.7 30.47 7.72 37 2337 13.5
255/70R17 112T 620 A B STD OWL 6.5 - 8.5 7.5 10.2 31.18 7.91 41 2469 14
265/70R17 115T 620 A B STD OWL 7 - 9 8 10.7 31.42 8.27 43 2679 14
P285/70R17 117T 620 A B STD OWL 7.5 - 9.5 8.5 11.5 32.76 8.94 46 2833 14
215/65R17 99T 620 A B STD OWL 6 - 7.5 6.5 8.7 28.15 6.77 31 1709 13
235/65R17 108T 620 A B XL BLK 6.5 - 8.5 7 9.5 29.21 7.52 35 2205 13
245/65R17 111T 620 A B XL OWL 7 - 8.5 7 9.5 29.53 7.68 37 2403 13
255/65R17 110T 620 A B STD OWL 7 - 9 7.5 10.2 30.16 8.19 36 2337 13
265/65R17 112T 620 A B STD OWL 7.5 - 9.5 8 10.6 30.59 8.5 41 2469 13
235/60R17 102T 620 A B STD OWL 6.5 - 8.5 7 9.6 28.31 7.64 32 1874 12.5
255/70R18 113T 620 A B STD OWL 6.5 - 8.5 7.5 10.2 32.13 8.07 42 2535 14
265/70R18 116T 620 A B STD OWL 7 - 9 8 10.7 32.64 8.39 44 2756 14
265/65R18 114T 620 A B STD OWL 7.5 - 9.5 8 10.7 31.54 8.54 42 2601 13
275/65R18 116T 620 A B STD OWL 7.5 - 9.5 8 11 32.13 8.74 43 2756 13
265/60R18 110T 620 A B STD OWL 7.5 - 9.5 8 10.7 30.55 8.62 41 2337 12.5
275/60R20 115T 620 A B STD OWL 7.5 - 9.5 8 10.9 33.03 8.86 44 2679 12.5
275/55R20 117T 620 A B XL OWL 7.5 - 9.5 8.5 10.9 31.93 9.13 44 2833 12.5
265/50R20 111T 620 A B XL OWL 7.5 - 9.5 8.5 10.6 30.51 8.78 42 2403 12.5

Reviews

Rated 1 out of 5 by from Not what I expected from a cooper tire I like the look, I like to tread pattern, and the price was very reasonable. I put these tires on my 2017 Ram 1500 in August of 2018. The tread is not holding up that well, only put 35,000 on them so far and I’m at about 1/4 tread left. I would say what I’m most frustrated about is the lack of grip these things have. A little mud, rain or snow and they don’t even hook up hardly at all. Needless to say I probably wouldn’t purchase these if you drive in any of those conditions often. Maybe I just got a bad batch? I’m not sure. Probably going to look into another brand for my next purchase.
Date published: 2019-05-10
Rated 5 out of 5 by from 3rd set of these tires for different vehicles. They work great. Replaced the stock Firestones on my 2019 Jeep Cherokee Trailhawk. Much better handling, and so much quieter. Allready had a set on my Isuzu Trooper, so i new what a great tire they are. Work great in snow rain and offroad here in southern Oregon. I highly recommend them.
Date published: 2019-05-08
Rated 5 out of 5 by from 3000 miles, 1 Texas Flood, 1 Colorado Blizzard & a trip to a West Texas Desert First of all, I went with a 235/60 R17 on a completely stock 2018 Subaru Forester XT. I wanted a beefier tire, but one that could run on a stock setup and not need a lift. I downsized my wheels to 17" and equipped them with Coopers. Luckily Cooper has their new Discoverer AT3 4S at this size. I literally purchased my wheels and tires 2 days before I departed for a long road trip. This road trip was to take me from Houston, TX to Rocky Mountain National Park. Total distance for the trip when I got back home was 3000 miles. In 12 days we hit the mountains, 1 tornado warning storm, 1 blizzard, and a West Texas desert. I didn't notice much of a drop in MPG in the city if any at all. On my 3000-mile road trip, I really can't give an accurate measurement. The first part of my trip about 300 miles through flat land, I noticed about a -1 MPG difference. Keep in mind, my Forester was loaded down for 10 days of camping, had a roof rack, cargo basket and loaded cargo bag. That along with a Thule rack on the back with 2 mountain bikes. I averaged 21.0 MPG. When my Forester was new I went to Lubbock, TX and back (about 1100 miles) and averaged 24.5 MPG on the stock setup but not loaded down and with nothing on the roof. I can honestly say, this tire is awesome. The Coopers have no additional road noise, they felt great in the rain and way confident in the snow and ice. I'm definitely a Cooper convert now. I purchased my Coopers from Discount Tire, the best tire shop ever.
Date published: 2019-04-23
Rated 5 out of 5 by from Will be buying a second set Living in central Minnesota on a township road (Gravel) my wife has gone through all the snow and has gotten home every time in her Nissan Rouge.I will be buying another set in a few months and putting some on my Honda Pilot.
Date published: 2019-04-14
Rated 5 out of 5 by from I was a tester for Canadian Tire I was invited to Montreal QC and San Antonio TX Through Canadian Tire's TESTED FOR LIFE IN CANADA campaign to test the Cooper Tire AT34S . I am an x off roader and x truck driver, so I've had many years on all sorts of terain and weather conditions. The AT34S are a great Tire I 100% approve these tires in all aspects that a general consumer looks for as well as the weekend warriors that want to play hard on the trails.
Date published: 2019-03-16
Rated 4 out of 5 by from 2-1/2 Years later My first review was rejected at editing, so I'll try this one.. Good tires, 265/R/17's, no problems, went everywhere we asked them to go, living in the desert, it's dry, hot, and we get UV damage. These Coopers did OK and we go everywhere on off road trails. Sharp rocks, dirt, sand, up and thru the mountain trails, etc..In All Seasons..but we always air down & up again. Smart 4x4 Runners. The only reason for not 5 stars, is that these tires are down to 5/32 after only 10K miles. Maybe too soft of a compound ? So yesterday, we installed the next level, 275/R/17 LT tires, E-rated, more tire, more grip, harder... Tune in for that review in a few months.
Date published: 2019-02-24
Rated 4 out of 5 by from 4 Runner At3, 2-1/2 years old, Not bad... Installed in July of 2016, on a 2010 Runner, 265/70/R17, ran that generation of AT3's until now. Tires were quiet, handled great, not a problem at all. Went everywhere I asked them to go. Always rotated, aired down when off roading, took good care. Hey, I don't want to be considered a dummy... Living in the Desert, it's DRY, lots of UV damage, heat, and crappy roads, but easy to go to mountains, sand, and fun...These tires did it all in two years +, and still look good. My only concern? Only a little over 10K miles and I'm down to 5/32nd tread, and I'm concerned w/ punctures/cuts when in the sharp rocks. We like the Adventures... In any case, going with another set of Coopers tomorrow, kicking it up a notch, with 275/70/R17 this time as that is the best I can do w/o trimming or lifting. I wish Cooper still made the C rating, but I am stuck with E rated tires in that size. Perhaps the E rated tires will be a little longer lasting? We'll just wait & see...Tune in later... Still, I recommend the Coopers, PLUS, MADE IN THE USA, and they support the PBR. Double Bonus...
Date published: 2019-02-21
Rated 5 out of 5 by from perfect year round tire bought 4 new in 2018....5000 miles in dry to wet to deep snow , these tires performed very well in all conditions and actually show no wear and still look new...
Date published: 2019-02-07
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Videos

Warranty

Standard Limited Warranty
Free 45-Day Road Test
105,000 km Treadwear Protection - Euro-Metric Sizes


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

Reward

  • 70

    Discoverer AT3 4S™

  • Stopping distance as compared to leading all-terrain tires, based on performance against top competitors from a leading consumer publication. Individual on-road results may vary.