Discoverer AT3 4S™

Fits SUVs/CUVs and Trucks/Pickups All-Season

Discoverer A/T3 4S™ is rated 4.9 out of 5 by 25.
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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 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
Rated 5 out of 5 by from Love the revision to the AT3 I've been running AT3's since 2009 and the new incarnation of the tire is fantastic! I've had the opportunity to run them in sand and snow and they haven't let me down. We live in metro Denver and I have them on my 2005 GMC Sierra and my wife's 2012 Jeep Wrangler Unlimited. Mother Nature dumped 11.6" of snow on us Monday (1/28/19) and both vehicles got through the deep snow with no problem. We've traveled 3,200 miles round trip in the Jeep and the AT3's are excellent highway tires. We'll keep AT3's on our vehicles.
Date published: 2019-01-31
Rated 5 out of 5 by from Awesome Tire! These are fantastic tires. Was going back and forth between a highway all season or an all season mixed use on road/off road tire. I decided to go with the Cooper AT3 4S and have been extremely pleased with the tire. Slightly more road noise than a highway tire but that is expected with an AT tire and worth it. Highly recommend these tires as they look great on the truck and function as described by Cooper. We are in the middle of a snow storm and -20 degree polar vortex here in Michigan and these tires are performing impeccably. I expect the gravel/off road performance to be the same and they ride great on the highway as well. Go get these tires if you are considering them!
Date published: 2019-01-30
Rated 5 out of 5 by from A truely amazing tire I live in the Reno / Lake Tahoe area and bought these tires a few weeks ago and they are the best tire I have ever owned. I put them on my 2011 Jeep Grand Cherokee Overland. I have had Bridgestone, Goodyear, and Michelins nothing compares to this tire off and on the road. The snow gripping is amazing and the tire road noise is non-existent! These tires gave my jeep a whole new feel, more secure and strong! I would have given them 10 stars if I had the ability. See for yourself try them you will find out I am right.
Date published: 2019-01-29
Rated 5 out of 5 by from Super smooth ride Just installed these cooper ATS 4s on my 2013 Ram truck , I live in Northern California lots of wet weather, rain and snow. These tire perform great in wet conditions. The Ram came with Goodyear SRA's and the ride was smooth but no traction in wet weather. Great looking tire also. I can't rate the treadwear yet.
Date published: 2019-01-24
Rated 5 out of 5 by from Awesome tires I recently had four of these tires installed on my pickup because my other tires would easily slide on ice, almost got me in a wreck. I did a lot of research and hoped these tires would be better. The day after installation we had a severe winter storm with ice and 5" of snow. I drove into my neighbors driveway which goes downhill. He said, man you shouldn't have pulled in here you're going to have a hard time getting out, its solid ice. I thought he was probably right so I began to back up and I was shocked, my truck backed up the hill like I was on dry pavement. I didn't have to accelerate, no tire spinning.These tires are even better than I had hoped. Would recommend them to anyone. I did not rate the tires on treadwear quiet,off road, or durability because I haven't had them long enough.
Date published: 2019-01-22
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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

  • 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.