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Your cart is empty.The Cooper Discoverer STT Pro All-Season LT315/70R17 121Q Tire is the most extreme all-season, off-road tire Cooper offers to date, providing remarkable off-road performance without sacrificing on-road traction. The Discoverer STT Pro tire delivers best-in-class off-road performance, empowering the extreme off-roader to take on the toughest challenges. Patented Armor Tek3 tire technology adds strength to the tire sidewall, providing increased resistance to damage while driving over boulders and uneven, tough terrain. The Discoverer STT Pro comes with rubber formulated to combat shredding and damage from stones and off-road obstacles. The ROCK CLIMBER SIDEWALL gets max traction to help conquer even the toughest obstacles with deep ‘Climber Cleats’ and Flex Grooves built into the side of the tire that grip jagged rocks and power through thick mud. The MUD SLINGERS 2.0 are deep, wide trenches with additional notches throughout the tread combine to give you more grip to power through and help continuously clear thick mud from the tire. The EARTH DIGGERS can tackle tricky terrain with large blocks with alternating mud scoops that forcefully dig into loose dirt, sand or sticky mud. The STONE ARMOR TECHNOLOGY provides the ultimate durability with channels, ridges, and edges designed to help defend against sharp rocks and debris while expelling lodged stones.
jul's
Reviewed in the United States on March 19, 2025
very pleased with the quick shipment
George Hammack
Reviewed in the United States on January 25, 2025
Quiet and rugged. I was super leiry of buying tires on line. These tires are amazing. Very little if any road noise. Went from 265 to 315. Felt very little loss of power. The difference on the trails were significant. These tires bite and release the mud better than I could have imagined. Absolutely love the look, agility, and off road capabilities. Would highly recommend. I have tried uploading a picture but it won't let me. Anywho. They are amazing
Bogie
Reviewed in the United States on April 26, 2025
shorse
Reviewed in the United States on March 12, 2024
Yeah, they do look nice, but I don’t really care much about that, I want function. They’re mounted on a 3rd gen Cummins Dodge pickup so I can’t speak for how well they’d do under a lighter rig, but under a heavy rig like mine they do excellent. I’ve never had trouble in snow, ice or mud. They’re a bit noisey, but if you’re buying big knobby tires you probably shouldn’t care about that. They are a bit difficult to balance sometimes, having good wheels helps. I’ve had this set for a couple years now and the tread is barely worn, I’m not sure how many miles I have on them, I haven’t kept track. I tow quite a bit with my pickup, mostly a four horse trailer that we take places we probably shouldn’t, I’ve blown lot’s of tires on the trailer, even having to drive out on one axle with no spares left, but on those trips I’ve never blown one of these tires.
Wisconsin H.
Reviewed in the United States on December 16, 2024
Been running these for about 5,000 miles and they are holding up Great! Much quieter than expected, no sliding in the rain like the stock tires, balanced well and great value for these tires. They run smooth but the only difference I noticed was losing approx 1 mpg. But for the value and performance, I'll take it.
John Sweazen
Reviewed in the United States on October 12, 2023
My first set of the Discovery STT Pro lasted approximately 42,000 miles and still had enough tread to go another year. I decided to swap out my old tires because they have been on my Jeep for almost 10 years and due to an alignment issue there was some cupping. The new tires are amazing. There is very little road noise and the Jeep handles very well. I think as these tires wear out the road noise will increase (I believe this has been typical of other tires I've had on my previous Jeep). Overall I am very happy with the previous tread life of these tires and impressed with their on-road performance.
thomas j leonard
Reviewed in the United States on December 8, 2022
I have 2 jeeps, and have had coopers for about 5 years now. My first big tires were Goodyear Kevlar - and they didn't last too long. Then I tried Nitto Ridge Grapplers and they allowed me to use my winch while the rigs on Coopers drove past me, so I changed to the SST Pro. Love them. Got a solid 40,000 out of a set of 40's, beating on them every weekend. On my wife's 2-door, she is up to 52,000 miles with about 3/16" of tread left. Last year, the pandemic forced me to get Mickey Thompson's for my 4 door, and so far they are working as well as the cooper. I hope they continue. When nobody around here could get them, I was able to Amazon a set for my wife, and she will be safe all winter.
Götz Jäger
Reviewed in Germany on December 13, 2020
Top-Reifen zu einem wirklich guten Preis erhalten.Sehr empfehlenswerter Verkäufer!
Savannah WILL
Reviewed in the United States on January 26, 2019
I purchased 4 of these off off Amazon for my 2018 Jeep Wrangler JL 4-door. The JL is the newest Wrangler platform with an aluminum body.I have 75 days and 4,000 miles on these tires for my evaluation.First, they are direct "bolt-on" - no need for a lift kit or any modification.The tires weigh 54 pounds each.The tread is oriented more for off-road than "all-terrain" in my opinion which is exactly what I was looking for.I have driven them many miles on muddy trails and they do a great job at both traction and not clogging up with mud.On pavement they are not quiet but they are at a lower hum than a pair of Coopers I had in 2008 on a 4x4. The hum is certainly tolerable and as good as could be expected.My biggest surprise is the wet road braking response of these tires. It is excellent. I have had some in the past that were like a sled on a down hill snow slope when it came to wet weather braking.UPDATE: 14 Feb 2022 -- 4 years and 45,000 total miles. These Coopers surprised me for the longedivity I got out of them. There's nothing I didn't really like about them. I'm back here to buy my next set. I thought about switching up, going maybe with Geolander, but these really worked out for my 2018 Wrangler JL.I would buy these tires again in a heartbeat. No regrets.... SAVANNAH WILL
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