Cooper adds Discoverer Stronghold AT tires

New Cooper Discoverer Stronghold AT all-terrain tire shown on a truck.

Need a heavy duty all-terrain tire that won’t break the bank? The new Cooper Discoverer Stronghold AT fits the bill, with 28 sizes to fit four rim diameters. It’s designed to grip hard on dirt and gravel, but it also has a Severe Snow Designation in all sizes and even comes in a couple of 35″ options.

Based on their Discoverer series, the new Stronghold AT has a stronger reinforced casing, added side hook lugs, and a tread pattern designed to grab rock but shed pebbles.

Tread design

Key claimed features include:

  • Wide open grooves to grab and release soft surfaces.
  • Narrower center (cross) grooves for improved stability.
  • Strategically designed tread lugs resist cracking, tearing, and rounding of the tread.
  • Ledges between the lugs help prevent stones getting stuck in the tread.
  • Specialized rubber compound and wide lateral grooves help plow through water.
  • Textured edges on the inside of the shoulders lugs grab into snow to help provide traction in harsh winter conditions.

A strong shoulder design with scooped tread edges, wide tread grooves, and sidewall hook pattern all help provide grip in deeper sand and muck.

Inside, the tires have a two-ply polyester casing plus a single-ply, polyamide reinforcement above two high-strength steel belts.

What sizes do they offer?

size chart for new cooper tire discoverer stronghold at all-terrain tires.

The Cooper Discoverer Stronghold AT has options for 16″, 17″, 18″ and 20″ rims. There are a lot of options for all of them, plus a true 35″ option for the 17″ and 20″ rim diameters

This gives you options for all the popular pickup trucks and off-road vehicles, including the Ram 2500/3500, GMC Sierra 2500/3500 HD, Chevy Silverado 2500/3500 HD, Ram ProMaster 3500, Ford F-250/350 Super Duty and the Jeep Gladiator Rubicon. There’s even some that fit the Ford Transit and Mercedes Sprinter vans, just be sure to check the load rating:

What’s the load rating?

Got a heavy rig? Tow a trailer? No worries, they’re E Load Rated (10-ply or equivalent), and Load Indexes range from 115 to the low 120s, which should be enough for almost any standard passenger truck, van, or SUV, even fully built ones. I recommend checking against your actual vehicle weight…not just its stated GVWR (because you know most of our rigs are pushing the limits).

How much do they cost?

Prices range from about $206 to $445 depending on size. Expect most 16″ rim models to be well under $300 per tire. They have a 45-day satisfaction guarantee and come with a 60,000 mi./ 95,000 km warranty. (Check price at and Amazon)

Side note: Goodyear acquired Cooper Tire in 2021 and has been busy integrating their systems. This new tire likely takes full advantage of Goodyear’s technology and manufacturing processes while maintaining Cooper’s more approachable pricing. It also means these are available through Goodyear’s tire centers.

About Tyler 81 Articles
I'm a serial traveller and road trip lover who's crisscrossed the US so many times I've lost count. I've owned cars, SUVs, wagons, vans and a 37' class A toy hauler RV, and I've customized them all! I love the open road and getting off the beaten path to find new adventures, mainly traveling with Kristi and the kids to explore the world on our own two feet (and, usually, two to four wheels)!

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