Cooper

Cooper Discoverer STT PRO - LT275/65R18/E 123/120Q Tire

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Item # 980133877
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Highlights

  • Mud Terrain, All Season
  • Trucks
  • Severe Weather Traction
  • Notable Off-Road Performance
  • Extreme Off-Road Tire
  • Outlined White Letters
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cooper discoverer stt pro - lt275/65r18/e 120q tire three-quarter front-facing view showing aggressive deep tread blocks, wide mud-clearing voids, large shoulder lugs and black sidewall with raised COOPER DISCOVERER STT PRO lettering; mounted on glossy black multi-spoke wheel, emphasizes off-road traction and severe weather capability. Often used by truck owners for rock and mud driving.
Cooper Discoverer STT PRO - LT275/65R18/E 123/120Q Tire
Hero image 0 of Cooper Discoverer STT PRO - LT275/65R18/E 123/120Q Tire, 0 of 4

About this item

Product details

Before purchasing tires, make sure to use our Tire Finder to select the right fit for your vehicle.

Rock Climber Sidewall™ Technology helps conquer the toughest obstacles. Stone Armor™ Technology helps defend against sharp rocks and debris. Uniquely formulated rubber compound for outstanding performance in wet and dry off-road conditions.

A Strong Defense
Stone Armor™ Technology protects the tire from damage caused by sharp rock and debris.

Grip Through Mud
Mud Slingers™ 2.0 offer deep, wide trenches with additional notches that continuously clear thick mud from the tire.

Tackle Tricky Terrain
Earth Diggers™ Technology digs deeper into mud, sand or dirt with large shoulder scoops and lugs.

45-Day Test Drive
Need time to make sure these tires are the right ones for your vehicle? Cooper Tires offers a 45-Day Test Drive to test out your new tires.

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Specifications

Product Details
Tire Size:275/65R18/E
Service Description:123/120Q
Sidewall:Outlined white letters
Material # or MSPN:170-121-034
Rim Width (min. to max.):7.5-9.0
Section Width:10.9
Overall Diameter:32.3
Tread Depth (32nds):19
RPM:642
Max Load (lbs.):3415 lbs @ 80 psi
UTQG Rating
Treadwear:
Traction:
Temperature:

Warnings and disclaimers

Disclaimer

Wheel Not Included

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Showing 1-1 of 1 review

Aug 13, 2026
Reviewer name: Alicia
1 out of 5 stars
1 out of 5 stars review

Fake Off-Road

I purchased a completed set of these less than a year ago for my older pickup used mainly for dumping trash and launching jon boat. First time the truck went 'off -road' (if you'd even call it that) while riding through wooded trail behind house, one of the tires got punctured when driving over a fallen branch. The puncture is too close to the sidewall, so I can't get it repaired. Forced to purchase a whole new tire, even though these are practically brand new (200-300 miles). I think the tire looks good and seems to ride fine on pavement. However, I would advise staying away if you're wanting an actual decent off road tire. If you're just wanting something that looks good on the road, but doesn't really perform in the realm they're marketed for... these are for you.

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