Discoverer® STT PRO™

Fits Trucks/Pickups All-Season

Discoverer STT PRO™ is rated 4.4 out of 5 by 151.
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Standard Limited Warranty
Free 45-Day Test Drive

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
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 54 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
LT305/60R18 126\123Q F RWL 8.5 - 11 9 12 32.68 10.08 66 3750 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 125\122Q F BLK 8.5 - 11 9.5 12.4 33.5 10.43 68 3640 20.5
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
35X12.50R20LT 125\0Q F BLK 8.5 - 11 10 12.4 34.69 10.2 71 3640 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 AMERICAN MADE GRIP I’ve bought Cooper MT’s for about 13 years now including the older STT’s. The most recent I bought 3 years ago for my 2017 F-350 6.7 diesel in 305/70R18 (35.08x12.4) they started with a tread depth of 21/32. Now with 14k they are at 17/32. That’s great tread wear for a heavy diesel with mud grips. It’s imperative to keep your tire psi at the appropriate level. If you have the time do a chalk test as I did. I found the best footprint was at 45psi cold in the front and 40psi cold in the back. Once warm they raise to 50F/45R.Up the pressure before towing anything heavy of course. As for traction they are amazing. I live in Oregon and face lots of rain, mud and snow. I’ve aired down for hunting season and beach driving as low as 15psi. Couldn’t ask for better performance.
Date published: 2020-04-11
Rated 5 out of 5 by from This is the best tire i have ever bought. This is a quit and great off road tire.I had nitto mud grapplers and only got 20,000 on them.I have 10,000 on these and they look brand new still.The ride is awesome on pavement and wet roads.This will be the only tire I buy from here on.Mine are 37's and i didn't want to buy another set anytime soon.
Date published: 2020-04-03
Rated 5 out of 5 by from Best M/T on the market. already ran 10k miles on this tire, great off-road traction. It is noisy on the highway, but compared to other M/T tires very quiet. rides okay on road. a bit rough. but it is an M/T after all.
Date published: 2020-03-17
Rated 5 out of 5 by from Tread Wear Have put 50k on a set under my diesel and only have a little over half tread gone. Cooper has really stepped up their game and got back to making really good tires.
Date published: 2020-02-02
Rated 5 out of 5 by from which way round ? I bought a set of these tires & will fit them on my raptor once I get my rims painted … question is do I put the blue writing on the sidewall on the inside not showing or on the outside .. can I put them on the inside ?
Date published: 2019-12-28
Rated 1 out of 5 by from Will never put the tires on a truck again! I own a 2015 Ford F150, which I bought my from the dealer new. The truck already had these tires on the truck. They looked amazing and besides the road noise from the tires, it rode very well until I got up to speeds above 65 miles an hour. Above 65, the front end begins to shake and bounce. Does not keep staking and bouncing, but comes and goes frequently. You can feel the bouncing. Took the truck back to the dealership to check the tire balancing, They told me there were no issues with the balancing and they didn't know why the front end was bouncing. I'm in the military, so I drove the truck to New York from Texas a couple days after they checked the balancing as I headed to my next assignment. Bounced the whole way. I took it to the Ford dealer there who told me there were no issues as well. This time I had them check the balancing, suspension, and shock absorbers. Again no issues. Now the tires have 27k miles and I have to replace them. Very disappointed in these tires as to replace them is like taking out a small loan when they should have lasted another 30k miles or so.
Date published: 2019-12-12
Rated 5 out of 5 by from Great all around tire I'm on my second set of these tires. put 65000 on my first set and now have 25000 on set # 2 . I run these on my Hummer all season as I am always in the backwoods of Maine.These tire have never let me down.I would say they are not the best grip tire for the snow on paved roads in Maine but they are great off road.Overall if you drive smart these tires work well in the winter months.
Date published: 2019-11-21
Rated 1 out of 5 by from Cupped in front right away very noisy Would not recommend very noisy and cupped right away
Date published: 2019-11-20
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Warranty

Standard Limited Warranty
Free 45-Day Test Drive

Download the 2020 Consumer Replacement Tire Guide, Limited Warranty & Registration Booklet.

Reward

100 Discoverer® STT PRO™