Discoverer STT PRO™

Fits Trucks/Pickups All-Season

Discoverer STT PRO™ is rated 4.4 out of 5 by 138.
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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 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
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 Durable and long lasting I purchased these tires for heavy travel and traction. I now have 65,000 miles on them. The secret to long term use is correct balance, alignment, and tire rotation every 10,000 miles. I have a 2009 Sierra 2500 HD with 20s. If my wheel are not balanced correctly the tread wears fast. The noise is not bad in my truck as I stay on the phone while traveling. I wanted to wait to post my review for when it was time to purchase another set of 4. Grip in all weather types is phenomenal. I never had problems in any condition until almost bald.
Date published: 2019-08-02
Rated 5 out of 5 by from Great on-road performance tire I've gotten 47k miles out of these tires so far and they've still got quite a bit of tread on them. I expect another 20k miles. They're on a 2015 RAM 2500 which hardly goes off-road. I bought these for Winter traction in snow and ice and I'm not disappointed. These are outstanding tires and I recommend them.
Date published: 2019-07-17
Rated 5 out of 5 by from Perfect for offroad Great tire. Looks good on my 96 d21 and they are Perfect for Danish offroad
Date published: 2019-07-04
Rated 5 out of 5 by from Best off-road tire on the market I'm not generally a product review guy but I really needed to do this one. These are by far the best off-road tires I've owned over the past 30 years. They perform superbly in every situation I've faced from mud in PA to the slick rock in Moab and everything in between. I've run them as low as 8psi on my beadlocks in large sharp rocks and the sidewalls have held up great. Snow isn't an issue either. I'm running 37x13.50x17's on my JKU. I've got 50k + miles on this set and I still have 7/16" tread left. I found a shop that will balance this set on beadlocks (very few will) and for the size of these tires they required surprisingly little weight. Another thing - don't go crazy with the air pressure in these. I run 26 psi and they ride great. If you go with what the tire shops pump these up to you'll be riding around like an empty dump truck. Do yourself a favor and do the chalk test on your vehicle to see where you best pressure is - if you don't know what that is - Google it. You'll be happy you did. Yes, they have gotten louder as they've worn but that's to be expected in this kind of tire. The performance is well worth it. Cooper - PLEASE DON'T CHANGE THE TREAD COMPOUND OF THIS TIRE! It's perfect as-is.
Date published: 2019-07-03
Rated 1 out of 5 by from Two of four tires were lemons After 4 months of driving two of the four tires wore down in a way I have never seen before. completely uneven and they make my truck drive like in doing 80 on a bumpy dirt road when I'm really driving 20mph in my neighborhood. the other two look brand new and still have 1.4cm of tread depth. they handled well in snow, mud, and on the road. I also had my truck aligned when they were first put on, tires balanced and rotated twice then had my alignment checked again. They are just faulty tires that nobody should buy.
Date published: 2019-06-27
Rated 5 out of 5 by from I recommend these tires to all 4x4 enthusiasts I put a set of 35's on my 82 Toyota pickup and was plowing snow on a forest road in Oregon. It was amazing I had snow packing in my winch and grill and the tires never lost grip. I have also hit ladee flat right out of estcada which is trails with mud areas and a rock quarry with a hill climb. These Tires are great everywhere, I went straight the rock quarry hill climb no slip. I hauled threw the mud pits no worries. All at 10psi no beed locks. They are the best tires I have ever had hands down.
Date published: 2019-06-26
Rated 5 out of 5 by from Best off road tire I've ever owned! Best off road tire I've ever owned. Has gotten me through any situation I've thrown at it. In fresh snow they perform well, but not on ice. However if you are a sensible driver and don't drive like a moron on icy roads you will be just fine. :) Noise level. Oh boy, these are noisy and you can feel them rumbling when you start and come to a stop as well as at lower speeds. Now, this isn't a big deal to me because my truck is loud and heavy, but might be something to consider if you want a real quiet ride. They may be quieter if your vehicle isn't as heavy, but I couldn't tell you because I've only used these on a large f350. But for the excellent off road performance, it's a good trade off. But again, this isn't a big deal to me and I probably wouldn't mind even if my truck was quieter. Noise levels or slight rumbling while driving don't bug me. Even though they are noisy on road, they handle well in the city as well as highway and I feel safe when driving with these tires. My ratings: Overall: 9/10 Off Road 11/10 (they are that good) Pavement: 7/10 Winter (snow): 8/10 Winter (Ice): 5/10 Fuel efficiency: N/A (truck guzzles gas anyway, lol)
Date published: 2019-06-09
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
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Warranty

Reward

70 Discoverer STT PRO™