Discoverer AT3 4S™

Fits SUV and Truck All-Season

Discoverer A/T3 4S™ is rated 4.6 out of 5 by 68.
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Standard Limited Warranty
Free 45-Day Test Drive
65,000 Mile Treadwear Protection - Euro-Metric sizes

The Discoverer AT3 4S™ with Adaptive-Traction Technology grips the surface, rocky or smooth, under the most severe weather, rain or shine.

  • 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 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 Great tire, great winter traction! I couldn’t be happier with this tire, I had the old AT3’s and loved them but this tire is even better, Unbelievable traction and handling in the snow and a very quiet ride on the highway, would recommend these to anybody.
Date published: 2020-01-05
Rated 1 out of 5 by from Useless in Ice and Snow I can honestly say these are the worst tire with a snowflake ive used. In snow, they are terrible. On ice, they are useless. Previously used LTX AT2's, BFG K02's, Duratracs and Geolanders, and could get up the hill by my house in 2wd. with these i struggle in 4wd. There so bad i stuggle to move on my flat plowed driveway. If you live anywhere that snows regularly do not buy these tires. There are good on dry and wet surfaces, with minimal tire noise.
Date published: 2020-01-02
Rated 3 out of 5 by from Not as expected Installed on 2019 Ram 1500 Sport 275 55/R20 I read a ton of reviews on this tire and so far they don't perform as well as expected in the snow. Now we haven't had alot of snow yet, only about 10 cm or less maybe need more snow to give real test on performance. I put motormaster Winters Edge made by Cooper on our 2018 Honda CRV and find them excellent. I'll update post when we get more snow as to test these AT3 4s tires.
Date published: 2020-01-01
Rated 5 out of 5 by from Perfect tyres!!!! For all use. I have only done 1500 miles on the AT3 4S but wow!!!! These tyre really hold the road in both dry and wet weather taken the hilux through the woods with boggy mud grounds and climbs through the rocks well too. I wanted the STT PRO initially for that aggressive look but they didn't fit my 2015 toyota hilux. I was recommended the at3 4s not as aggressive looking but the picture doesn't really do them justice. On the truck they look good and no road noise. ... I will have tyres again
Date published: 2019-12-28
Rated 5 out of 5 by from Love this Tire Cooper Discoverer M&S - Lasted over 100K. Great tire for wet and snow conditions. Changed to A/T3 for my Jeep Grand Cherokee. Love the tire, love the look, love the grip. I am sold on Coopers.
Date published: 2019-12-20
Rated 5 out of 5 by from Will buy again! The ride quality, traction and noise levels have been great! I have 20k+ miles on them so far and it looks like I will fall a little short of the 65k, but that will not stop me from buying again.
Date published: 2019-12-13
Rated 5 out of 5 by from so far, so good! 2016 Ram 1500, 275/60r20 love the AT3 4s so far. had the opportunity to experience how well behaved they can be on very icy roads. they performed admirably. roads were covered in a coating of ice after heavy rain conditions then turned into a sudden drop in temps creating a surface you could probably almost skate on. these tires stuck very good, which is what I was hoping for when I chose them... hopefully they last awhile and maintain this ability :) they're quiet and ride nice on dry pavement, and they also perform pretty good on the backroads. I'm very happy so far with these tires. Great job Cooper!
Date published: 2019-12-10
Rated 2 out of 5 by from Tire has potential, but doesn't last....(16k) This is my second time writing this review, because Cooper Tire rejected my first one citing it didn't follow its' guidelines. Pretty sure it did, but here goes the second: I bought these tires this past spring about 16k miles ago for my wife's 2017 Nissan Armada. First go of a Cooper Tire as recommended by the tire shop owner. US made helped too. They are about at 5/32 left, and my local tire guy even commented on them being so low when I had them there the other day for rotation.(Which I have them do every 5k since it's free where I bought them) They drive great, look great, do fine in both wet and dry conditions, but I guess I won't find out how they do in snow since I will be needing another set before winter. Seems quite short of a time for a set of tires to last even on a heavy vehicle like her Armada, and like I said the tire owner even said that seemed odd. Hope this review meets the guidelines to be posted, so I may share my positive and negative points with other potential customers.
Date published: 2019-12-09
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Videos

Warranty

Standard Limited Warranty
Free 45-Day Test Drive
65,000 Mile 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.