Discoverer STT PRO™

Fits Trucks/Pickups All-Season

Discoverer STT PRO™ is rated 4.4 out of 5 by 122.
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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
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 Will buy them again I have 22,000 miles on my STT PROs and they still look great! I off road many times a year when up at the ranch and they have never let me down....they get me through things that I wouldn't try with other mud tire brands....IMO THE BEST!
Date published: 2019-04-15
Rated 4 out of 5 by from Great for plowing, now buying ST/MAXX After about 20 sets of M/T, I thought to try something different. Bought 4 STT pros. 295/75/17. After 6000 K. Never spun a wheel all winter plowing, Still look new! Quite ride considering tread , but with no plow on & only a 625lb. Salter in the bed, you can hear me coming a block away,well figure when I hook up my plow! Just ordered 305/70R 18 ST MAXX for the summer. 2018 3500 HD single wheel Duramax.
Date published: 2019-04-15
Rated 5 out of 5 by from These are the tires for all needs I bought some 295/65/20 (35 inch) tires for my lifted F150 and I can tell you these tires are simply awesome. I was expecting a much louder ride because of the aggressive tread, but I was pleasantly surprised when on the road and highway. These grip the road better than my other tires too, even in rain and icy conditions. I highly recommend these tires for anyone wanting a better tire for both off-road and around town.
Date published: 2019-04-14
Rated 5 out of 5 by from Great tires Have 40,000 miles on a set of 275/70/18's on a 2014 Toyota Tundra. These tries will likely last another 5,000 miles (they have about 4-5/32's tread left) through the summer. Wear even, great off road performance on Wyoming backcountry 2 tracks in mud or snow. Sidewalls amazing for no rock/stump damage. Will be buying another set. Fairly quiet on highway for how aggressive they are, last 5,000 miles or so the "road noise" has definitely increased.
Date published: 2019-04-11
Rated 4 out of 5 by from All around tire Dont ever write on deals like this but figured might try once. The stt pro is an excellent all around tire for people who drive all conditions and are have a broad spectrum of uses and not bent on singular scenario preformance. I cannot comment on mileage becuase of driving conditions but it was north of 30,000 miles. My driving is hwy all conditions and off road also, I have always gotten traction when needed and handled good with loaded gooseneck cow trlr. The tires are what they are ment to be and I have no bad ratings or comments with that said I am not purchasing these becuase of my vehicle use but I am going with the st maxx. I have researched quite a bit on the at3 Lt and was torn between the those 2 styles but I still believe 4wd truck used off road needs to have tires suited for that environment and I dont need an aggressive tire as I used too and would like to get more mileage from my purchase if possible. My fuel economy was still normal. I'm happy with the cooper brand!
Date published: 2019-04-02
Rated 2 out of 5 by from Good off road, bad on road I had the cooper st Maxx before and loved them. Switched to thses st pro's in the same exact size. I instantly lost 5 mpg. The trick is a 2013 F150 Ecoboost. Tried playing with tire pressure and no matter what I do the truck gets 13mpg when it used to get 18+. I've had them on for about 15k miles and they have gotten pretty noisey too despite rotating every 4k miles. Tires still have a ton of tread left but now I'm looking to purchase a different set. I just can't get over the mpg drop and the road noise.
Date published: 2019-04-01
Rated 5 out of 5 by from Off road tires without a compromise These tires are awesome. I've put about 5,000 miles on by now, through every type of terrain and weather. Mounted them during a snowy winter, and I've been mudding hard since the snow melted and the rain began. These things are absolute beasts off road, and surprisingly good in snow and on pavement as well. There is barely any noise despite the aggressive tread, and no noticeable wear in 5k miles. No damage from the rocks so far either. I should also mention that I am a very aggressive driver. Highly recommend.
Date published: 2019-03-29
Rated 5 out of 5 by from Smooth and quiet tire considering how aggressive it is. I recently had these installed on my 2000 Wrangler TJ in 33x12.5x15. They have a slight hum on the highway, but it is far less than expected for an aggressive looking mud tire. They are quite smooth riding on the highway at 65-70mph as well. If anyone wants a dead silent tire get a mall crawler AT. Oh yeah, and these look cool to boot.
Date published: 2019-03-26
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Warranty

Reward

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    Discoverer STT PRO™