Discoverer STT PRO™

Fits Trucks/Pickups All-Season

Discoverer STT PRO™ is rated 4.5 out of 5 by 97.
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Standard Limited Warranty

The Discoverer STT PRO™ is the most extreme all-season, off-road tire Cooper® offers to date, providing remarkable off-road performance without sacrificing on-road traction.

  • Tread design helps to prevent stone retention
  • Armor Tek3® Construction for added tire durability
  • The shoulder of the tire was designed with soft surface "cleats" and mud "scoops"

M+S Rated

Features

Dry Performance

The tire’s ability to grip the road in dry conditions.

Wet Performance

The tire’s ability to grip the road in wet conditions.

Tread Wear

The wear rate of the tire.

Quiet Ride

The measure of how quiet a tire is while driving.

Handling

How the tire is able to respond to driving such as accelerating, braking, steering and turning.

Off Road

The tire’s ability to have grip on unpaved surfaces such as dirt, mud, sand, rock or gravel.

*When compared to other Cooper® tires.

Tire Design

  • 3-2 Inner Tread Ribs

    Unique hybrid 3-2 tread pattern reduces noise and increases stability.

  • Alternating Shoulder Lugs

    Enhance traction in mud and soft surfaces.

  • Anti Stone Retention

    Resists stone retention which helps to increase the life of the tire.

  • Mud Relase Dimples

    Aid in keeping the read pattern free of loose soil.

Full Specs

Tire Size Service Description UTQG Load Range Sidewall Approved Rim Width Measured Rim Width Section Width Overall Diameter Tread Width Tire Weight Max Load Tread Depth (1/32")
30X9.50R15LT 104Q C RWL 6.5 - 8.5 7.5 9.6 29.57 7.72 44 1985 19
31X10.50R15LT 109Q C RWL 7 - 9 8.5 10.7 30.75 8.5 48 2270 20
32X11.50R15LT 113Q C RWL 8 - 10 9 11.7 31.57 9.09 54 2535 20
33X12.50R15LT 108Q C RWL 8.5 - 11 10 12.2 32.72 9.8 60 2205 21
35X12.50R15LT 113Q C RWL 8.5 - 11 10 13.1 34.57 10.08 67 2535 21
LT215/85R16 115\112Q E BLK 5.5 - 7 6 8.5 30.59 6.34 42 2680 18.5
LT235/85R16 120\116Q E BLK 6 - 7.5 6.5 9.6 31.89 7.13 49 3042 18
LT225/75R16 115\112Q E BLK 6 - 7 6 8.9 29.49 7.05 43 2680 18
LT245/75R16 120\116Q E BLK 6.5 - 8 7 9.6 30.71 7.52 47 3042 18
LT265/75R16 123\120Q E RWL 7 - 8 7.5 10.7 31.89 8.43 54 3415 18.5
LT285/75R16 126\123Q E RWL 7.5 - 9 8 11.2 32.99 8.82 61 3750 19
LT315/75R16 127\124Q E RWL 8 - 11 8.5 12.6 34.53 9.69 69 3860 20.5
LT305/70R16 124\121Q E RWL 8 - 9.5 9 12.3 32.99 9.88 62 3525 19.5
LT255/75R17 111\108Q C RWL 6.5 - 8.5 7 10.3 31.89 8.11 51 2405 19
LT265/70R17 121\118Q E RWL 7 - 8.5 8 10.7 31.93 8.5 45 3195 18.5
LT285/70R17 121\118Q E RWL 7.5 - 9 8.5 11.5 33.03 8.98 62 3195 19
LT295/70R17 121\118Q E RWL 7.5 - 10 8.5 12 33.46 9.69 66 3195 21
LT315/70R17 121\118Q E RWL 8 - 11 9.5 12.6 34.57 10 67 3195 21
LT305/65R17 121\118Q E BLK 8.5 - 11 9 12.3 32.68 9.88 65 3195 21
37X12.50R17LT 124Q D BLK 8.5 - 11 10 13 36.77 10.2 77 3525 22
37X13.50R17LT 121Q E BLK 8.5 - 11 11 13.3 36.77 10.98 84 3195 22
40X13.50R17LT 121Q C BLK 8.5 - 11 11 13.6 39.76 10.98 92 3195 22
LT275/70R18 125\122P E RWL 7 - 8.5 8 11.3 33.31 9.09 63 3640 20
LT295/70R18 129\126P E RWL 7.5 - 10 8.5 12 34.49 9.69 70 4080 21
LT305/70R18 126\123Q E RWL 8.5 - 10 9 12.4 35.08 9.88 71 3750 21
LT275/65R18 123\120Q E RWL 7.5 - 9 8 10.9 32.28 8.82 59 3415 19
LT285/65R18 125\122Q E RWL 8 - 10 8.5 11.8 32.91 9.49 63 3640 19
LT325/65R18 127\124Q E RWL 9 - 12 9.5 13.7 34.69 11.1 78 3860 21
LT305/60R18 121\118Q E RWL 8.5 - 11 9 12 32.68 10.08 65 3195 21
37X13.50R18LT 124Q D BLK 8.5 - 11 11 13.3 36.77 10.98 82 3525 22
38X15.50R18LT 128Q D BLK 11 - 13 12 15.4 37.87 12.28 95 3970 21
LT275/65R20 126\123Q E BLK 7.5 - 9.5 8 10.9 34.49 9.09 63 3750 19.5
LT295/65R20 129\126Q E BLK 8 - 10 8.5 11.7 35.43 9.65 68 4080 19.5
LT295/60R20 126\123Q E BLK 8 - 10 8.5 11.5 34.29 9.65 67 3750 19.5
LT295/55R20 123\120Q E BLK 8 - 10 9.5 12.3 33.07 10.2 65 3415 20
LT305/55R20 121\118Q E BLK 8.5 - 11 9.5 12.4 33.5 10.43 69 3195 20.5
35X12.50R20LT 121Q E BLK 8.5 - 11 10 12.4 34.69 10.2 69 3195 21
37X12.50R20LT 126Q E BLK 8.5 - 11 10 12.6 36.69 10.31 77 3750 21
35X13.50R20LT 121Q E BLK 8.5 - 11 11 13.2 34.57 11.1 78 3195 21
37X13.50R20LT 127Q E BLK 8.5 - 11 11 13.3 36.85 10.79 82 3860 21
38X13.50R20LT 123Q D BLK 8.5 - 11 11 13.6 38.19 10.79 84 3415 21
38X15.50R20LT 128Q E BLK 11 - 13 12 15.4 37.83 12.28 94 3970 21
LT325/50R22 122Q E BLK 9 - 12 10 12.9 35.12 11.38 77 3305 21
35X12.50R22LT 117Q E BLK 8.5 - 11 10 12.3 34.76 10.39 72 2835 21
37X13.50R22LT 123Q E BLK 8.5 - 12 11 13.4 36.89 10.79 82 3415 21

Reviews

Rated 5 out of 5 by from 04 Dmax with lift 2004 GMC 4wd diesel with 6" lift, power level is above stock but nothing crazy, about 60hp over factory LLY. I'm over 20k miles on the tires and would expect them to last to 35k. I've been stuck, once, and it was an odd situation and I just sunk immediately and framed out. Pulled out friends and random folks in mud, snow and mud and snow. I drive quite aggressive, not spinning the tires on dry pavement but all the dirt roads, and abuse the tires. I had my buddy mount them at his farm and I've never rotated the tires, actually they were never balanced. Factory the vehicle has a steering stabilizer shock. No wobble in the wheel, drive true and straight(I could let go of the steering wheel at 70mph and no concern, look great and are wearing well especially considering my lack of maintenance. I've driven on ice, snow, pavement, gravel and mud. I have no experience with sand or rocky terrain. The sound has started to increase, but that's very likely the owners fault, my lack of rotation and never being balanced. I'll buy them again. I'm on a set 315/70/17. I rarely hook a trailer to this truck, so no comment with regards to that.
Date published: 2018-10-29
Rated 5 out of 5 by from (Cooper’s STT-Pro )Best Off Road Tire On The Market I am currently on my second set of Stt Pro’s and looking to purchase a third set. I have gone places with these tires that most people could only dream of and beyond that..... I have never once been let down by my Stt Pro’s... and as a matter of fact if the traction of these tires were any better they would tear my face off as I ascend to the moon in my little Jeep . The technology in these tires is unlike anything else out there . If you wish to experience these tires at their best than you need to get off the pavement . I daily drive my Jeep and wheel it hard on the weekends .... Best all around tire money can buy.....Twisted Metal.......
Date published: 2018-09-20
Rated 5 out of 5 by from About 1,500 miles in, not disappointed! Purchased these for my Titan (295.75.18). I have ran Coopers nearly all my adult life. These caught my eye, because the aggressive look, it is amazing. I am about 1,500 miles in and am not disappointed! I have went on pavement in the city and dirt roads hunting. I’m not an extreme 4x4er, but I do get off road. I will report back in time on my feelings, but the road noise is minimal, not much difference between 30 and 85 mph. My friends have been overly impressed on comfort and noise. I am planning to buy these again when I wear them out, no questions asked, at this time.
Date published: 2018-09-10
Rated 5 out of 5 by from Best truck tires on the market I'm on my second set of SST PRO tires only because I went with a bigger size for my truck. These tires are incredible. I'm running 37's and they wear better than the smaller tires on my commuter car. Bottom line this is the only tire I will go with. Period. Case closed.
Date published: 2018-09-09
Rated 2 out of 5 by from Nearly impossible to balance I purchased 6 of these in 37x12.5x17 for use on a modified Ford Raptor and had two Discount Tire stores attempt to mount and balance on two different sets of wheels. Only 2 of the 6 were balanced well enough for use on the front. When it came time to rotate, I added balancing beads and that helped some, but my inability to properly rotate them has caused odd wear of the tread blocks. This wear has started to cause intermittent shimmy. A shame because there is plenty of tread depth remaining. As for performance, they've been decent. Their dry traction has been good, but their wet pavement traction hasn't inspired a ton of confidence. They've stood up to some rough rocks and have been good in the mud. Having said that, I did actually get a flat from a STAPLE. While the tread life seems to be better than the BFGs I had prior, I think I'll be going back to BFG.
Date published: 2018-09-06
Rated 5 out of 5 by from off road tires I bought a set of STT Pros to replace the KMTs I had on my Jeep and all I can say is what a huge difference. The STT PROs are outstanding in the way they perform, they hook up fantastic in the mud and snow. They make the KMTs feel like slicks offroad. If you want a great offroad tire the STT PRO is the one.
Date published: 2018-08-26
Rated 5 out of 5 by from BEST TIRE HANDS DOWN Have tried Nitto, Toyo, Mickey all the “Name Brands”. This will be my second set of Cooper Discoverer STT Pro and have gotten 60k out of my first set!!!!! I did rotate these every oil change and ran correct tire pressure. On my Dodge Cummins with 8in lift my 37x12.50x20 Coopers have been the best tires EVER!!!!!!!
Date published: 2018-08-10
Rated 4 out of 5 by from Long-term review The Cooper stt Pro was a great Tire I was able to get 47793 miles out of it and would have reached 55k or 60k if I rotated more frequently had great on road manners and great off road they had really good wet traction never had an issue with hydroplaning all around a really good aggressive Tire highly recommend
Date published: 2018-07-31
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