Discoverer STT PRO™

Fits Trucks/Pickups All-Season

Discoverer STT PRO™ is rated 4.5 out of 5 by 104.
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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 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 Best Tire for the Money with Excellent Wear! I have these on my 08 JK in the 38x13.50x20 and couldn’t be more pleased! Quiet on Road with Excellent wet weather traction! I have 6k on them and they have virtually no sign of wear! I ran the old Cooper in 37’s and got over 60k on them! The main thing you MUST do is rotate & balance every 3k!
Date published: 2019-01-08
Rated 5 out of 5 by from Great tire, excellent mileage 295/65R20. Bought these tires about 3 years ago and to this day I have just at 55,000 miles on them. These are hands down the best mud tires I have bought. They are excellent in the mud and on the road. Only complaint is that they are a bit noisy but that is to be expected with a big mud tire.
Date published: 2018-12-14
Rated 5 out of 5 by from on my FJ love it. i have 285/75/r16 on my fj and it just looks awesome its just a bee hive going anything above 60 km/h
Date published: 2018-12-12
Rated 4 out of 5 by from great off road tire These tires got me out of more than one pickle, but they are not very good as far is rainy conditions on the highway.
Date published: 2018-11-15
Rated 1 out of 5 by from Horrible I bought a set of STT Pro's in a 305/55/r20 to put on my lifted 14 Silverado 1500, based on my previous experience with Cooper tires. What a disappointment I will be lucky to get over 20,000 miles with them. I rotate them religiously every 3,000 miles and everytime they have to be rebalanced. Have replaced all front suspension components and realigned the truck still doesnt help. These tire are wearing horribly and the ride is terrible even for a mud tire. Maybe I got a bad set but I will not take a chance running these again.
Date published: 2018-11-14
Rated 5 out of 5 by from Excellent Truck Tire Got these in 315/70/17 for my Power Wagon, and I love the tires. They have been great in all conditions to include rock/off road, mud, highway, and snow/ice. I have taken them off road and towed my 7600lb camper. They feel great on the road, and the road noise is pretty minimal for this type of tire. I was surprised at how well they did in the snow and ice when hunting elk. I have not had them for that long, but I am sold on these tires. They were also much more affordable than the Goodyears I had in the past. Great job Cooper!
Date published: 2018-11-11
Rated 5 out of 5 by from Finally found “THE TIRE” I without a doubt recommend this tire to anyone who likes an aggressive tire but is scared that mud tires are loud and “hockey pucks” in the winter! These tires are very well mannered! I own a business that relies heavily on driving down the highway as well as deep into the bush and even after 50,000miles am still astonished by their performance
Date published: 2018-11-11
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
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