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Cooper Discoverer AT3 4S Tire Review

8.9Expert Score

On-/Off-Road All-Terrain

Off-Road performance
Wet Performance
Dry performance
Comfort performance
Treadwear performance
Cooper Discoverer AT3 4S
Cooper Discoverer AT3 4S
Strong sides
  • Attractive treadwear warranties
  • Optimized dry and wet road traction
  • Utilize durable manufacturing materials
  • Decent performance on snowy roads
Not so good
  • Perform poorly on muddy roads

Cooper Tires has made a name in the all-terrain market segment by introducing Cooper Discoverer AT3 4S tires. The tires are designed to offer safe driving and are available in different sizes (15-22 inches) to perfectly fit full-size SUVs, select crossovers, and light trucks. 

All-terrain tires remain unbeatable when it comes to combining highway performance and off-roading. They balance grip and handling to give you a comfortable ride, wherever and whenever. 

This review covers everything you need to know about Cooper Discoverer AT3 4S Tires, their specs, cutting-edge technologies used in their manufacture, and how they perform under different driving conditions.

Cooper Discoverer AT3 4S outperforms 99% of tires in the On-/Off-Road All-Terrain category.

What are the features of the Cooper Discoverer AT3 4S?

This is a durable tire brand that uses a silica-based compound that extends its service life. It is vital for enhancing grip under different roads. The traction of the tires is a combination of Cooper’s Adaptive-Traction technology and the Secure-Grip all-terrain patterns. Cooper Discoverer AT3 4S tire is enhanced using open ribs, guaranteeing exceptional performance on dry and wet roads.

Cooper Discoverer AT3 4S tread pattern
Cooper Discoverer AT3 4S tread pattern

Cooper has done a great job in improving defense against hydroplaning. The tires have wide circumferential and lateral notches, which are assisted by Aqua Vac channels. They facilitate the quick evacuation of water from the road surfaces. The edges of the tire blocks are engineered to improve traction on snow using the Snow Groove Technology and Micro-Gauge sipes. 

Cooper Discoverer AT3 4S tires are among the most durable all-terrain tires, with their internal construction reinforced using plied polyester casings, nylon reinforcements, and steel belts. They improve the stability and the handling of the tires at different driving speeds.

Cooper Discoverer AT3 4S tires are suitable for winter use. They come with the 3-peak mountain snowflake symbol (3PMSF) and can provide sufficient snow traction. Their performance can be modest but may perform poorly under extreme winter conditions.

How long does the Cooper Discoverer AT3 4S tire last? 

Cooper Discoverer AT3 4S tires have one of the best tread life warranties. The company provides a limited tread life warranty of 6 years or 65,000 miles, whichever comes first. The uniformity warranty is limited for the First 2/32″ treadwear. The company handles all replacements for defective tires for a maximum of 6 years and covers all expenses relating to poor quality for the same period. The company offers a 45-day trial period for all verified purchases.

Discoverer AT3 4S tires have wear indicators within the treads of the tire. The tires require replacement when the tread wear indicators (rubber inserts) flush with the treads.

Off-road performance

8.8Expert Score


Discoverer AT3 4S tires have a good record when it comes to off-road service. Although they are not a perfect choice, they have admirable off-road results. They have above-average traction over rough, hard-packed surfaces like dirt or gravel. They provide sufficient grip to maneuver these roads. Handling of the vehicle over such roads is decent and remains responsive to steering controls.

The tires provide reasonable traction on mud surfaces. The performance of the tire over such roads is dismal compared to mud-terrain specialized tires. On rocky surfaces, the tires have superb traction. The tough sidewall casing protects them against abrasion and punctures from chip cuts.

Wet performance

9.2Expert Score

Hydroplaning resistance
Wet traction

The Discoverer AT3 4S tires utilize the AquaVac Channels in their construction. It gives them a superb performance on wet roads. The additional sipes within the tread blocks enhance wet traction making the tires highly responsive to steering controls. These tires have excellent braking characteristics and can stop over very short distances. The wide longitudinal and lateral grooves allow maximum evacuation of water to improve driving safety and protect vehicles against hydroplaning.

Overall, these tires offer the drivers a certain level of confidence, thanks to their predictable handling, sufficient wet traction, and braking characteristics.

Dry performance

9.2Expert Score

Cornering stability
Dry traction
Steering response

Discoverer AT3 4S tires have balanced dry road and wet road performance. They are reliable tires that ease regular highway commuting. These tires have excellent dry traction with remarkable responsiveness. They react promptly to steering controls and provide sufficient grip for cornering at moderate to high speed.

The braking distance is equally short, making them safe alternatives for drivers who want to enjoy the thrills of off-roading and high-speed highway driving. Discoverer AT3 4S tires retain a uniform contact patch on the dry roads. Once the grip is firm, the driver gains driving confidence which comes with the straight-line stability of the tires.

Comfort performance

9Expert Score

Ride quality
Noise score

Discoverer AT3 4S tires provide a quiet ride on the highway. On rougher surfaces, the noise levels are maintained at lower levels. Conversations inside the vehicle are hardly interrupted by the rumbling of the treads. The tread patterns are designed to absorb most of the surface noises. Cooper uses Whisper Grooves Technology to maintain the noise levels at decent levels. 

The two-ply polyester casings and nylon reinforcements absorb the shocks and vibrations emanating from the road surface to offer drivers a comfortable ride on the highways. 

Are Cooper AT3 4S good in snow?

8.6Expert Score

Light Snow Traction
Deep Snow Traction
Ice Traction

Discoverer AT3 4S tires have aggressive treads to allow easy handling and steering over snowy roads. The tires use Cooper’s Snow Groove Technology which uses ZigZag tread block edges to increase the snow-to-snow biting edges. It reduces the braking distance and increases snow traction making the tires safe for driving over light.

When exposed to deep snow and ice, the tires tend to underperform. The braking distance increases, and the handling gets challenging. They are not a suitable choice for extreme winter conditions.

Tire sizes & specifications

Tire sizeLoad index/ Speed ratingUTQGMax loadMax InflationTread DepthTire WeightWheel DiameterRim Width RangeMeasured Rim WidthSection WidthTread WidthOverall DiameterRevs Per MileCountry
225/70R15100T SL620 A B44 psi13.5/32″30 lbs156-7.5″6.5″9″7.3″27.7″749US
235/75R15109T XL620 A B50 psi14/32″33 lbs156-8″6.5″9.3″6.9″28.7″721US
235/75R15105T SL620 A B44 psi14/32″31 lbs156-8″6.5″9.3″7″28.7″721US
255/70R15108T SL620 A B44 psi14/32″36 lbs156.5-8.5″7.5″10.3″8″29.1″713US
265/70R15112T SL620 A B44 psi14/32″38 lbs157-9″8″10.9″8.7″29.7″699US
265/75R15112T SL620 A B44 psi14/32″38 lbs157-9″7.5″10.5″8.1″30.6″679US
215/70R16100T SL620 A B44 psi13.5/32″29 lbs165.5-7″6.5″8.7″7.2″27.7″748US
225/70R16103T SL620 A B44 psi13.5/32″32 lbs166-7.5″6.5″9″7.3″28.7″723US
225/75R16104T SL620 A B44 psi13.5/32″30 lbs166-7.5″6″8.6″6.7″29.1″712US
235/70R16106T SL620 A B44 psi13.5/32″33 lbs166-8″7″9.4″7.7″28.8″719US
235/75R16108T SL620 A B44 psi14/32″32 lbs166-8″6.5″9.3″7″29.7″698US
245/70R16111T XL620 A B50 psi13.5/32″36 lbs166.5-8″7″9.8″7.6″29.5″704US
245/70R16107T SL620 A B44 psi13.5/32″34 lbs166.5-8″7″9.8″7.9″29.5″704US
245/75R16111T SL620 A B44 psi14/32″37 lbs166.5-8″7″9.6″7.4″30.3″684US
255/70R16111T SL620 A B44 psi14/32″38 lbs166.5-8.5″7.5″10.2″8.2″30″690US
265/70R16112T SL620 A B44 psi14/32″40 lbs167-9″8″10.8″8.5″30.4″682US
265/75R16116T SL620 A B44 psi14/32″41 lbs167-9″7.5″10.5″8″31.6″657US
215/65R1799T SL620 A B44 psi13/32″30 lbs176-7.5″6.5″8.7″6.9″28.2″737US
235/60R17102T SL620 A B44 psi12.5/32″31 lbs176.5-8.5″7″9.6″7.9″28.3″732US
235/65R17108T XL620 A B50 psi13/32″34 lbs176.5-8.5″7″9.5″7.9″29.2″710US
235/70R17109T XL620 A B50 psi13.5/32″37 lbs176-8″7″9.5″7.7″30″691US
235/75R17109T SL620 A B44 psi14/32″35 lbs176-8″6.5″9.3″7.1″30.8″674US
245/65R17111T XL620 A B50 psi13/32″36 lbs177-8.5″7″9.5″7.9″29.5″702US
245/70R17110T SL620 A B44 psi13.5/32″36 lbs176.5-8″7″9.7″8″30.5″680US
255/65R17110T SL620 A B44 psi13/32″37 lbs177-9″7.5″10.2″8.4″30.2″687US
255/70R17112T SL620 A B44 psi14/32″40 lbs176.5-8.5″7.5″10.2″8.3″31.2″665US
255/75R17115T SL620 A B44 psi14/32″39 lbs176.5-8.5″7″10″7.8″32″649US
265/65R17112T SL620 A B44 psi13/32″39 lbs177.5-9.5″8″10.6″8.8″30.6″678US
265/70R17115T SL620 A B44 psi14/32″42 lbs177-9″8″10.7″8.6″31.4″660US
285/70R17117T SL620 A B44 psi14/32″45 lbs177.5-9.5″8.5″11.5″9.2″32.8″633US
255/70R18113T SL620 A B44 psi14/32″42 lbs186.5-8.5″7.5″10.2″8.4″32.1″645US
265/60R18110T SL620 A B44 psi12.5/32″39 lbs187.5-9.5″8″10.7″8.9″30.6″679US
265/65R18114T SL620 A B44 psi13/32″40 lbs187.5-9.5″8″10.7″8.8″31.5″657US
265/70R18116T SL620 A B44 psi14/32″45 lbs187-9″8″10.7″8.8″32.6″635US
275/65R18116T SL620 A B44 psi13/32″43 lbs187.5-9.5″8″11″9.1″32.1″645US
255/50R20109H XL620 A B50 psi12/32″38 lbs207-9″8″10.4″9.8″30.1″689US
265/50R20111T XL620 A B50 psi12/32″40 lbs207.5-9.5″8.5″10.6″9.3″30.5″680US
275/55R20117T XL620 A B50 psi12.5/32″44 lbs207.5-9.5″8.5″10.9″9.4″31.9″649US
275/60R20115T SL620 A B44 psi12.5/32″44 lbs207.5-9.5″8″10.9″9.2″33″628US
275/45R22112H XL620 A B50 psi12/32″41 lbs228.5-10.5″9″10.9″9.1″31.7″654US
285/45R22114H XL620 A B50 psi12/32″42 lbs229-10.5″9.5″11.3″32″648US

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