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Discoverer AT3 4S™

Fits SUVs/CUVs and Trucks/Pickups All-Season

Discoverer A/T3 4S™ is rated 4.7 out of 5 by 53.
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Standard Limited Warranty
Free 45-Day Test Drive
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

Reward
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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 31 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 41 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
255/50R20 109H 620 A B XL BLK 7 - 9 8 10.4 30.08 8.58 39 2271 12
265/50R20 111T 620 A B XL OWL 7.5 - 9.5 8.5 10.6 30.51 8.78 42 2403 12.5
285/45R22 114H 620 A B XL BLK 9 - 10.5 9.5 11.3 32.01 9.88 45 2601 12

Reviews

Rated 5 out of 5 by from Solid purchase, Great performance I just put a set on and these are far and beyond the stock Ram 1500 tires. We just had our first 12"+ snow of the year and these tires make it feel like I had the stickiest of traction and was always in control.
Date published: 2019-11-14
Rated 5 out of 5 by from Money Well Spent! The 2005-06 Honda CR-V is supposed to be notoriously famous for pulling to the right while tooling down the interstate, but not with these Cooper AT3/4s tires. My CR-V tracks completely straight, the ride is buttery smooth, the cabin SUPER quiet, and the handling, superb. I have never bought a finer tire. I upsized to 225/70/16, and these aesthetically appealing tires really set my rig off. Can’t comment on severe weather driving conditions, as I am in SoCal, but I doubt the AT3/4s will disappoint in that area either.
Date published: 2019-11-10
Rated 5 out of 5 by from Best tire I've ever bought..... These tires are very very quiet. My last truck had Toyo A/T's on it and they howled. I'm not a young man and I've had several trucks in my life. I've had trucks with Ground Hawg's on them when I was younger and I've had trucks with factory tires. I called Cooper tire and ask to talk to an engineer before I ordered these tires. He told me I would be surprised with now little noise they make. He said they had been working hard to come up with a tire that would grip in the snow/mud/etc and not make a lot of noise. Mission Accomplished!!! Quietest tires I have owned and they drive fantastic.
Date published: 2019-11-06
Rated 1 out of 5 by from Terrible Mileage I have bought AT3's for years. My fist purchase of AT3 4S has been terrible. They are worn out after 25000 miles. I have given them proper care on my F150 and still they are shot. Cooper will not honor my personal rotation, they need proof. So I guess I am screwed
Date published: 2019-11-04
Rated 1 out of 5 by from Long time user- sadly disappointed I have had Cooper tires on my trucks for at least 25 years and have been very happy until this last set. After about 10,000 miles the front tires started cupping on the edge and making noise, sounded like bad wheel bearings. I rotated front to back and that stopped the noise for another 10,000 miles, then the cupping started again. Even though I had no noticeable out of balance symptoms, I took them to a Cooper Dealer to have them rebalanced. I gave specific instructions to rebalance, but not rotate. Well they rebalanced and cross rotated, so now my noise is back and I have no Idea which tires to switch. You can't fix stupid.
Date published: 2019-11-04
Rated 5 out of 5 by from Great tire very happy with these. bought them for my tow vehicle. performs better then expected....
Date published: 2019-10-31
Rated 5 out of 5 by from They keep getting better! I have been running Cooper Tires since running my first set up the Alaska Highway in 1975. I have run the A/T's, A/T3's and now the A/T3 4s on my Expeditions and F-150s and they just keep getting better! I did not like the look of the A/T3 4s at first but put a set on my 2017 Expedition because I could not get the older A/T3 WOW am I glad I did. They are much quieter without sacrificing drive ability and traction. This is my GO TO tire now and recommend it to everyone. We have every road condition imaginable in Anchorage from 80 degrees and dry to -25 and ice and it can hit -50 or more on the drive to Fairbanks then 40 degrees and raining on top of the icy roads the next day. The A/T3 4s is the best all around Truck / SUV I have used. I do run Studded Discoverer M+S on my F-150 in the winter because going down a hill on frozen wet roads without studs or tire chains is extremely dangerous. Keep making them better Cooper and I will keep buying them!
Date published: 2019-10-17
Rated 4 out of 5 by from Good tire Over all a good tire good traction on pavement and dirt roads my only problem is the balanced bad like 7 oz per tire bad if cooper tire could figure there road force issues and balance issues I truly think they could be the number one at tire on the marked I like them better than the bfg ko2 and Firestone destination at and the good year trail runner at but those all balanced better like 4 oz per tire so cooper tires make the balance issues go away and there perfect
Date published: 2019-10-14
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Videos

Warranty

Standard Limited Warranty
Free 45-Day Test Drive
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.