The Discoverer STT PRO is Cooper's Off-Road Maximum Traction light truck tire developed for the drivers of pickup trucks, Jeeps and SUVs who want confident, go-anywhere traction without sacrificing on-road performance. The Discoverer STT PRO is designed to provide impressive off-road capability combined with acceptable levels of on-road traction and civility.
Beginning with a robust, chip- and tear-resistant compound, the Discoverer STT PRO is molded into an aggressive, high-void tread pattern. Deep starting tread depths and alternating cleats and scoops in the shoulder lugs enhance traction in mud and other soft terrain, and mud release dimples help the tire self-clean. Anti-stone retention ribs at the base of the tread grooves eject small rocks to assist with preventing punctures due to stone drills. Wide lateral and circumferential channels aid hydroplaning resistance, and in-block siping creates additional biting edges for improved grip in slippery conditions.
The Discoverer STT PRO utilizes Cooper's Armor-Tek3 Construction technology, which features a robust, three-ply polyester casing to improve puncture resistance. Two wide, strong steel belts support the tread and are reinforced by a single nylon cap ply.
While Off-Road Maximum Traction tires, which are often called mud tires, are branded with the M+S symbol and able to churn through deep snow, their typical oversize applications and the relative absence of snow-biting sipes in their large lugs can challenge their on-road wintertime traction on packed snow and icy surfaces.
El Discoverer STT PRO de Cooper pertenece a la categoría: Tracción Máxima Fuera De Carretera para camiones ligeros. Fue desarrollado para conductores de picops, Jeeps y utilitarios deportivos (SUV, por sus siglas en inglés), que desean una tracción confiable todoterreno, sin sacrificar el rendimiento dentro de las carreteras. El diseño del Discoverer STT PRO proporciona una capacidad todoterreno impresionante, combinada con niveles aceptables de civilidad y tracción en carreteras.
El Discoverer STT PRO posee un compuesto de caucho resistente a cortes y astillas, moldeado en un patrón agresivo y con espacios amplios entre los bloques. El neumático nuevo posee una profundidad de huella honda, tacos y "palas" alternados sobre los hombros, que mejoran la tracción sobre superficies lodosas o sueltas, y hoyuelos que permiten la limpieza de lodo por si mismos. Segmentos que no permiten la retención de piedras en la base de las ranuras, ayudan a prevenir pinchazos causados por la posible perforación de estas piedras. Canales anchos laterales y circunferenciales ayudan a resistir el deslizamiento sobre agua (hydroplaning) y pequeñas ranuras en los bloques, crean una cantidad adicional de bordes adherentes, para mejorar la tracción sobre superficies resbalosas.
El Discoverer STT PRO utiliza la tecnología de construcción Armor-Tek3 de Cooper, la cual proporciona una estructura robusta de tres capas de poliéster que aumentan, aún más, la resistencia a pinchazos. Dos correas anchas de acero dan soporte a la huella y son reforzadas con una capa simple de nailon.
Los neumáticos de la categoría Tracción Máxima Fuera de Carretera poseen el símbolo M+S (lodo y nieve) y son capaces de remover nieve, pero su gran tamaño y la ausencia de pequeñas ranuras (conocidas como sipes) sobre la superficie de los bloques o tacos, pueden presentar un reto en la tracción para invierno sobre nieve compactada o superficies con hielo.
Specifications shown are as accurate as possible based on the information provided to us by the tire manufacturers. The dimensions reflect average values for tires measured on the specified measuring rim width. Individual tires may vary from data shown.
All tires are subject to continuous development. The tire manufacturers and Tire Rack reserve the right to change product specifications at any time without notice or obligation.
*Although regularly updated, the country of origin for tires may vary from what is shown. Unfortunately, we cannot accommodate requests for tires with a specific country of origin.
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Warranty summary for replacement tires purchased on or after 06/01/24(1 of 6)
See official manufacturer's warranty brochure for specific details.
New vehicle Original Equipment tire warranties often differ from those covering replacement tires. Consult your vehicle documents to confirm Original Equipment tire warranty coverage.
Tire Rack Test Results Cooper Discoverer STT PRO
Testing Off-Road Maximum Traction Tires 2021: Cooper Discoverer STT Pro(2:21)
The Cooper Discoverer STT Pro brings capable, backcountry traction to the table, but does it have what it takes to compete on the road where many of its rivals are also built to perform?
User feedback reveals the Radar Dimax All Weather tire excels in comfort, with many customers praising its smooth, quiet ride (scores 8-10). Treadwear receives strong marks for durability, with multiple reports of long-lasting performance. Winter traction is consistently rated well for an all-season tire, handling light snow confidently. Wet traction and hydroplaning resistance earn high praise (8-10), offering secure grip in rainy conditions. Dry traction stands out as a top strength, with near-perfect scores (9-10) for responsive handling and stability. Customers highlight its balanced all-season versatility, making it a reliable choice for drivers seeking year-round capability without compromising comfort or wet/dry performance.
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Customers Like:
64 reviews mention "Wet Traction"
60 positive
4 negative
Customers consistently praise the Radar Dimax's wet traction, with most scoring 9s and 10s for confident grip and hydroplaning resistance. High marks highlight reliable all-season performance in rainy conditions.
March 16, 2026
(Verified Purchase)
4.7 out of 5
...Traction in wet conditions was excellent...
Just drove through curb-hiding snow. Tires maintained traction beyond expectations, only slipping momentarily in the worst spots. I'm wholly impressed.
Otherwise, there's a minor amount of squirm to them, especially when the weather is warmer, compared to the summer tires that were swapped. Traction in wet conditions was excellent. Traction on gravel/debris was as-expected.
I haven't paid attention to tread wear as much, but nothing egregious has been noted.
Vehicle: 2025 Subaru WRX Premium Miles Driven on Tires: 5,000 Driving Conditions: Combined Highway/City Location: JOLIET, IL Driving Style: Average
...It rained my entire trip back to Mississippi and the tires felt secure starting and stopping with no hint of hydroplaning.
Even though the tread is more aggressive than the stock tires, these were much quieter. The day after I put these on my Sienna AWD I drove to Ohio and woke up to 6 inches of snow. Had a great day "playing" on the roads while everyone else stayed home. It rained my entire trip back to Mississippi and the tires felt secure starting and stopping with no hint of hydroplaning.
Vehicle: 2023 Toyota Sienna AWD 235/60-18 Miles Driven on Tires: 2,000 Driving Conditions: Combined Highway/City Location: OCEAN SPRINGS, MS Driving Style: Average
Very comparable performance to mid-higher tier value all-season tires in dry and wet with noticeably better performance in wintery conditions...
Very comparable performance to mid-higher tier value all-season tires in dry and wet with noticeably better performance in wintery conditions. Think General RT-45, Michelin Defender, etc but better when roads get snowed/iced up.
When new rear had tendency to slide out at sharp steering, but this tendency diminished with wear and running slightly lower pressure on rear axle.
Basically you get 95% of Michelin Crossclimate2 performance for half the price. Good value choice when dedicated set of winter tires isn't an option.
Tires were installed with proper dot orientation and only took 1/4oz to balance
Vehicle: 2015 Mitsubishi Mirage DE Miles Driven on Tires: 9,000 Driving Conditions: Combined Highway/City Location: WALDORF, MD Driving Style: Average
Customers report strong winter performance with most ratings in the 8-10 range, highlighting confident grip in snow and ice. A few scores around 7 show reliable capability for all-season use.
March 16, 2026
(Verified Purchase)
4.7 out of 5
Just drove through curb-hiding snow. Tires maintained traction beyond expectations, only slipping momentarily in the worst spots. I'm wholly impressed...
Just drove through curb-hiding snow. Tires maintained traction beyond expectations, only slipping momentarily in the worst spots. I'm wholly impressed.
Otherwise, there's a minor amount of squirm to them, especially when the weather is warmer, compared to the summer tires that were swapped. Traction in wet conditions was excellent. Traction on gravel/debris was as-expected.
I haven't paid attention to tread wear as much, but nothing egregious has been noted.
Vehicle: 2025 Subaru WRX Premium Miles Driven on Tires: 5,000 Driving Conditions: Combined Highway/City Location: JOLIET, IL Driving Style: Average
...Tires are excellent in snow and rain, and seem to be a good compromise for all-season use... since I live in the Cascade Mountain foothills and see snow annually, the snow rating is a bonus and these things are wicked in the snow - Mae me wish I had another 10" of ground clearance on the car, because it would be unstoppable for a 2-wheel/front wheel drive vehicle...
Responsive and surprisingly quiet, compared to OEM name-brand tires on my 2022 Bolt. Tires are excellent in snow and rain, and seem to be a good compromise for all-season use. I’ve seen zero difference in vehicle range, an if anything the Radar tire offers a less harsh ride, without compromising handling or braking performance. Price point is spot-on and since I live in the Cascade Mountain foothills and see snow annually, the snow rating is a bonus and these things are wicked in the snow - Mae me wish I had another 10” of ground clearance on the car, because it would be unstoppable for a 2-wheel/front wheel drive vehicle. I’d buy these again in a heartbeat over the OEM tire, made by a major manufacturer. Especially considering I could run two sets of these tires for the price of 4 of the OEM brand. The only downside: the Bolt doesn’t offer an onboard spare and the Radar Dimax isn’t lined with Slime, like the OEM. But for the difference in price and given the performance and value these tires offer, I’d definitely buy them again over OEM. Maybe carry a couple cans of Fix -a-flat, or even purchase AAA roadside cover for 5 years, an you’d still come out ahead.
Vehicle: 2021 Chevrolet Bolt EV Miles Driven on Tires: 1,000 Driving Conditions: Combined Highway/City Location: ENUMCLAW, WA Driving Style: Spirited
...bought in Dec 2025, good in the snow, happy with my purchase...
They look great on my Ford Flex,has aggresive tread .bought in Dec 2025,good in the snow,happy with my purchase,Discount tires mounted them in about 20 min
Vehicle: 2013 Ford Flex FWD SEL Miles Driven on Tires: 1,500 Driving Conditions: Combined Highway/City Location: NORTH BRANCH, MN Driving Style: Average
Customers overwhelmingly rate dry traction as excellent, with most scoring 9s and 10s. High marks highlight responsive handling and confident grip, making it a top choice for all-season Grand Touring performance.
February 05, 2026
(Verified Purchase)
3.9 out of 5
...Dry traction/noise/etc are all pretty good from what I can tell.
Decent enough tires, good value for the price. Bought based on reviews, especially snow traction.
It's about average snow traction for an all-season tire, rather than above average, which I have experienced and was expecting. Not bad, not dangerous, just not impressive.
Dry traction/noise/etc are all pretty good from what I can tell.
Vehicle: 2011 Subaru Outback 2.5i Limited Miles Driven on Tires: 3,000 Driving Conditions: Combined Highway/City Location: SCARBOROUGH, ME Driving Style: Average
Customers consistently praise the Radar Dimax's ride comfort, with most scoring 9s and 10s for smooth handling. Noise levels earn strong ratings (many 8-10), though a few note occasional road noise, maintaining high satisfaction for Grand Touring All-Season use.
March 16, 2026
(Verified Purchase)
4.6 out of 5
...I've seen zero difference in vehicle range, an if anything the Radar tire offers a less harsh ride, without compromising handling or braking performance...
Responsive and surprisingly quiet, compared to OEM name-brand tires on my 2022 Bolt. Tires are excellent in snow and rain, and seem to be a good compromise for all-season use. I’ve seen zero difference in vehicle range, an if anything the Radar tire offers a less harsh ride, without compromising handling or braking performance. Price point is spot-on and since I live in the Cascade Mountain foothills and see snow annually, the snow rating is a bonus and these things are wicked in the snow - Mae me wish I had another 10” of ground clearance on the car, because it would be unstoppable for a 2-wheel/front wheel drive vehicle. I’d buy these again in a heartbeat over the OEM tire, made by a major manufacturer. Especially considering I could run two sets of these tires for the price of 4 of the OEM brand. The only downside: the Bolt doesn’t offer an onboard spare and the Radar Dimax isn’t lined with Slime, like the OEM. But for the difference in price and given the performance and value these tires offer, I’d definitely buy them again over OEM. Maybe carry a couple cans of Fix -a-flat, or even purchase AAA roadside cover for 5 years, an you’d still come out ahead.
Vehicle: 2021 Chevrolet Bolt EV Miles Driven on Tires: 1,000 Driving Conditions: Combined Highway/City Location: ENUMCLAW, WA Driving Style: Spirited
Treadwear scores are predominantly 9s and 10s, with customers praising the Radar Dimax's long-lasting performance in all-season conditions. While a few lower ratings exist, most highlight exceptional durability for grand touring use.
December 02, 2025
(Verified Purchase)
4.5 out of 5
...I have over 7,000 mi on them they've worn great and they still work just as good as the day that I bought them...
Overall I was very skeptical at first because it's a lower end tire that's budget friendly and severe weather rated but I have been super impressed with how well they do I have driven in dry traction I've driven in the rain I've driven in mud snow pretty much everything that you could drive in I have over 7,000 mi on them they've worn great and they still work just as good as the day that I bought them 100% would recommend it's a good quality tire that's budget friendly would 100% buy this tire again
Vehicle: 2002 Toyota Avalon XLS Miles Driven on Tires: 7,000 Driving Conditions: Combined Off Road/Highway Location: WINCHESTER, NH Driving Style: Spirited
...I drive about 60 miles a day and i like them a lot
Much better than my previous tires. Very quite comfortable ride on asphalt , concrete and blacktop. I drove several times in heavy rain and they did great. stopping distance is really good in wet and dry. I drive about 60 miles a day and i like them a lot
Vehicle: 2021 Ford Bronco Sport Outer Banks Miles Driven on Tires: 1,200 Driving Conditions: Combined Highway/City Location: ELKHART, IN Driving Style: Average
Testing Off-Road Maximum Traction Tires 2021: Cooper Discoverer STT Pro(2:21)
The Cooper Discoverer STT Pro brings capable, backcountry traction to the table, but does it have what it takes to compete on the road where many of its rivals are also built to perform?
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