Cooper Discoverer ST Maxx Tire Review & Rating

One look at the Cooper Discoverer S/T Maxx and you may be wondering whether this is an all-terrain or a mud-terrain tire. It’s actually a hybrid design between the two, which really fills a need for tires that can deliver off-road performance that’s a step above an AT tire, while also maintaining a more civilized ride quality on the highway than you get with a MT tire.

Tread Toughness

Cooper utilizes what they term a 3-ply Armor-Tek3 construction in the carcass to go with new cut and chip resistant tread compound. The 3-ply design has two polyester plies that run across the tread diagonally from bead to bead.

The additional third ply runs at a 45-degree angle from bead to bead and provides superior strength and protection for resisting punctures, cuts and chips, while also providing you with commercial grade traction on the roughest of terrain. Aside from that, the tire sports a nice aggressive look to it that immediately lets everyone know that it means business.

Rating Verdict – Excellent

Dry Traction

Dry traction, whether on a paved surface or on dirt and gravel, is outstanding on the Cooper S/T Maxx. The tire’s 4-5 rib tread pattern give it impressive grip and stability beyond what you might expect to find from this type of tire.

Rating Verdict – Excellent

Wet Traction

Far too often you’ll find driving on rain slick road surfaces to be a bit challenging for most AT or MT tires. That’s not the case for the ST Maxx. Its silica and natural rubber tread compound, along with the added sipes, give this tire above average wet traction. You’ll feel added confidence behind the wheel when the weather makes driving conditions more difficult. It eliminates the white knuckle driving experience that no one wants to go through.

Rating Verdict – Excellent

Off-Road Traction

This tire is a beast when going off-road on all types of terrain. Whether it’s dirt, gravel, rock, grass, creek beds or whatever else that gets in its way, the ST Maxx goes through it as well as any other tire in this class. It drives through mud very well and cleans itself out without issues, although thick heavy mud is not its strong point. Make no mistake, this is not a bogger tire by any stretch. But for moderate amounts of mud you should find it performs quite well.

Rating Verdict – Excellent

Steering Response

There’s no denying that the Cooper ST Maxx is a heavier tire than your standard MT tire, and that has an effect on steering response. It gives you a little resistance that you can feel when driving around town or on the highway. That being the case, it is not enough to be a big issue with the tire, just something you’ll notice. We actually like the added feel as it gives you more of a sense of power and control.

Rating Verdict – Good

Winter Traction

The Discoverer ST Maxx is well suited for driving in winter weather. Regardless of snow depth, this tire goes through it with relative ease. The tire’s deeper tread pattern and added sipes are matched perfectly for the worst that Mother Nature throws your way in the winter. Performance on ice and slush are just as good. Reviews and ratings from other drivers confirm this as well. This is simply a tire that doesn’t let you down when winter rolls around.

It’s worth noting that Cooper has included the option to add studs if you live in an area that sees even more severe winter weather conditions.

Rating Verdict – Excellent

Ride Comfort

It’s one thing to have a tough tire that gets you everywhere you want to go, but can it do it without delivering a bone-jarring ride or a ride that leaves you having to yell at passengers just to be heard? After all, the majority of drivers spend more time on the highway than they do out in the backwoods, so comfort does come into play.

That said, the S/T Maxx is a tire that is surprisingly quiet on the highway and offers a pretty comfortable ride despite its load range E rating. Sure, the ride is a bit stiffer than you find on a load range C or D tire, but it’s not as harsh as you might think. We would say it is a little more comfortable than the Goodyear DuraTrac just to give you an idea.

As far as road noise goes, although it is a little noisier than some all-terrain tires, we feel it’s a little quieter than the Goodyear DuraTrac, as well as MT tires like the Toyo MT.

Rating Verdict – Good


Treadwear on the Cooper ST Maxx is above average compared to similar tires. The tough tread compound holds up well to miles of off-road use and represents a good value for drivers looking to get the most miles out of their tires. Although there is no mileage warranty, you can expect to get upwards of 60,000 miles out of them before seeing the wear bars. Of course, your mileage will vary depending on what you put them through.

Rating Verdict – Good


Cooper ST Maxx prices are in the neighborhood of what you’ll find on other comparable models from Goodyear, BFGoodrich and others. For example, a 31/10.50 R15 109Q C is approximately $189 for the ST Maxx. The same size for the DuraTrac is $182 and the Nitto Terra Grappler runs $214.

In an LT265/75 R16 123Q E, the cost is around $213 for the Cooper. The BFGoodrich T/A KO2 is $205, while the DuraTrac comes in at $194. Although not the cheapest tire in this class, the ST Maxx provides good value for the money when you consider its longer lasting treadlife.

Rating Verdict – Good

Tire SizeLoad/SpeedSidewallUTQG

Fits These Vehicles And Many Others:

  • Chevrolet Silverado, C2500, Blazer, Express 2500 Van, Traverse
  • Dodge Ram, Dakota, Nitro, Durango
  • Ford E-250 Econoline Van, F-150, Excursion, F-250
  • GMC Sierra, Yukon, Jimmy, Savana
  • Honda Passport
  • Hummer H3
  • Isuzu Rodeo
  • Jeep Liberty, Grand Cherokee, Wrangler
  • Kia Borrego
  • Land Rover Defender
  • Nissan NV2500, Xterra, Pathfinder, Frontier, Titan
  • Suzuki Equator
  • Toyota Tundra, FJ Crusier


Tire Uniformity – First 2/32 inch of wear

Materials & Workmanship – Lifetime warranty. Free replacement during first 25% of wear Prorated amount after that down to the final 2/32 inch of tread depth.

Final Verdict

Overall, the Cooper Discoverer ST Maxx delivers solid performance and ranks in the upper tier of this mud-terrain class. It’s an ideal fit for trucks and 4×4’s that spend a good amount of time off-road and need the added traction that a less aggressive AT tire just can’t provide. They also make a great choice when used for towing or hauling, as well as for construction trucks and other vehicles that see off pavement use or haul heavy loads.

One of the biggest issues we have heard raised on the ST Maxx is the weight of the tire. While this is no lightweight tire to be sure, it is not heavier than many comparable tires. For example, the Cooper S/T Maxx 285/70R 17 has a weight of 60 lbs. Compare that to the Toyo Open Country MT which weighs 66 lbs. for the same size, or the Nitto Trail Grappler which weighs in at 68 lbs. The Goodyear DuraTrac weighs in at 54 lbs.

In the long run, this is a tire that you can depend on to provide year-round traction both on and off-road, while also giving you a good ride quality.

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