Discoverer STT PRO™

Fits Trucks/Pickups All-Season

Discoverer STT PRO™ is rated 4.4 out of 5 by 130.
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Standard Limited Warranty
Free 45-Day Road Test

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 tread 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
LT305/55R20 125\122Q F BLK 8.5 - 11 9.5 12.4 33.5 10.43 68 3640 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 Great Tire These tires have been great so far (2K mi). Have 35s on 18 in rims on a lifted Wrangler JK Sahara. I'm very surprised how low of a noise they create on the road....especially the highway. Quieter than Rubicon stock rubber. Have only been lightly off road but had great grip the whole time. The one thing that happened that could be expected was sliding a bit in the rain when getting off an exit a bit quick.
Date published: 2019-05-28
Rated 5 out of 5 by from my best tire so far I‘m a forester and I have to drive very often quite heavy offroad conditions. I drive the stt pro‘s since about 12k kilometers and they only wore off about 1mm, so I‘m very happy with that. Sure they are louder than an all terrain tire, but for such an aggressive mud terrain tire, they are very comfortable onroad. The traction is exceptional. There was a situation where I had to drive a very steep and heavy track, with deep ruts and clay, with my Land Cruiser and a trailer on, which was normally only driven by ATV‘s, with no chance to turn around. I made it easily and the tires did great. Never had a problem with them. They are really puncture resistant and have very good behavior onroad. They perform quite well in deep wet snow, but not in icey conditions. The only negative thing is, that my tires don‘t have the M&S symbol, so I can‘t drive them in winter conditions, because that‘s not allowed in europe. It would be great if you could make a stt pro with siping, snowflake and m&s symbol on it for heavy offroad use during the winter months. There is no real offroad winter tire for real offroad use on the market, that you can use legally onroad. I will buy them again. Greetings from Germany.
Date published: 2019-05-17
Rated 3 out of 5 by from Didn’t last Tire handle good in mud, snow, and all round driving. Delivery what I was looking for. Down side was in the winter months it keep losing air. Big down side was after a year and a half I had to get new tire because the ring of the tire that Mount to the rim was damaged beyond repair.
Date published: 2019-05-10
Rated 5 out of 5 by from Awesome Jeep tire I've been running these on my Jeep Wrangler and love them. They've taken everywhere I've wanted to go, through thick mud, soft sand and over large rocks, without getting stuck or a puncture. Best tires I've ever owned.
Date published: 2019-05-10
Rated 5 out of 5 by from 52000 miles. I bought a set of these tires in 275/65r20 almost 3 years ago for my 2013 ram 1500. I put over 52000 miles on these tires and 2 of them would still pass inspection. To say I was surprised is an under statement. Was expecting to get 20-30k miles out of a M/T tire. Road noise wasn’t to bad, gets worse with tire rotations for the first 100-200 miles then they quiet back up. I live in the mountains of PA and these tires see plenty of snow and have no issues running in snow. I’ve had other aggressive tires such as nitto terras and got half the mileage, and less traction in mud, plus equal if not more noise then I have with my coopers. Highly recommend these tires. Just through my second set on a week ago and I’m hoping they outlast my time with this truck.
Date published: 2019-05-02
Rated 5 out of 5 by from I'll be buying another set!! This is the first set of Cooper's I've ever owned. Now with 30k on them I still have another 15k at least on them. They haven't let me down and I do a lot of on and off roading. Get lots of comments on them. Running a 35/12.50/20
Date published: 2019-04-28
Rated 5 out of 5 by from Extensively Tested 1 year old 33x12.5x15 I have tested several tires on a 90’s model K1500 with a lot of horsepower. Work / Hunt I hunt in a dog hunting club. So wherever your dogs go You go! Swamps, across clear cuts with stumps, through brush etc. Several other high end tires (Big Name brands )that were recommended lost chunks of rubber or had bad cupping. These tires have held up to some serious abuse. After a set of Nakang Mud stars that lasted 5 months. So I was already aggravated and took my frustration and anger out on these Coopers. Looking at them you can’t tell the abuse they have endured they still look new. Ran over a pile of discarded barbed wire... no problem Low speeds in clay of slick mud they clean well. Want to show off they do that too. Good rooster tails for the kids to watch. Creeks with rock beds without slowing down whole truck off the ground bouncing. Whatever you do to em they ask for more. I usually change tires yearly and give the old ones to neighborhood kids but I’m keeping these a while. My only regret is I don’t use 4x4 as often. Could have saved me some money on lockers. My wife has 2 sets in the garage for fear of them being discontinued. I don’t write reviews for anything. But this deserves some recognition. You want a tire you can abuse all weekend and drive to work on Monday this is it. Unless you wanna run Swampers and sound like gravedigger on the way to work.
Date published: 2019-04-25
Rated 2 out of 5 by from They just won't balance Absolutely love the tread pattern and performance off road, and they have plenty of traction on wet and dry pavement. They also perform quite well in deep snow, but they are a little scary on thin layered wet snow and slush on pavement during snow storms. My problem is these just shake too much for me to keep them on my vehicle (315/70R17s on a 2014 FJ Cruiser). Have tried traditional weights and balance beads, nothing can seem to stop the often violent shake at +45mph. After weights didn't work I had them remounted with Dynabeads, the tire shop first had me drive 500+ miles when the beads were installed to wait for the bags to pop. I drove it another 1000 miles after that (wheeling trip to Canada) and it didn't help. Added more beads, maybe reduced it a little, but still very shaky on highway. Have just hit 5k miles on these and I am giving up. I have two buddies running these in 37's and have zero issues, so maybe I just have a bad set. Unfortunately I ordered these online then had them installed by a different local tire shop, so I imagine neither is going to try and warranty them. Live and learn I guess.
Date published: 2019-04-22
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