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Discoverer STT Pro

Product Overview

The Discoverer STT PRO is Cooper's most advanced, extreme tire to date! The Discoverer STT PRO provides exceptional traction and performance in some of the harshest terrains on Earth. The distinctive tread design and compound provide remarkable on the road performance without sacrificing off-road traction. 3-Ply Armor-Tek3, silica tread compound, aggressive 3-2 center rib design, side-biters and more, all wrapped up in Cooper's advanced mud terrain tire.

“Armor-Tek3®” Carcass Construction

Cooper's proprietary and proven full 3-ply carcass construction in the tread and sidewall provides 50% more protection against impact damage than standard 2-ply tires. The third ply is oriented at an optimal angle to the first two plys to maximize carcass protection in extreme off-road conditions.

3-2 Inner Tread Ribs

The inner tread ribs of the Discoverer STT PRO are positioned in an alternating 3-2 pattern. This unique hybrid design provides a number of significant performance benefits like: reduced road noise, increased stability and handling, superior soft surface (trail) and mud traction, balanced wear, and reduced tendency for vehicle drift commonly experienced on fitments with aggressive off-road tires.

Large Depth Side Biters

The Discoverer STT PRO features large, specially-designed cleats of rubber (side biters) on the shoulder area of the sidewall, to enhance traction and grip in muddy or soft terrains and in rock crawling situations where maximum grip is essential. The orientation and design of these cleats promotes traction on inclines, reducing the chances of tire side-slip.

Flex Groove

The "flex groove" is a small, circumferential groove in the buttress region that generates a designed flex point in the tire. This ability to flex in a predetermined location provides a smoother ride by helping to dampen the impact generated by inconsistencies in pavement, potholes and gravel. In tough off-road situations where tires are sometimes aired down, this groove allows the tread and side biter to better conform and work together when traversing irregular, tough obstacles.

Performance Features

Here's how this tire performs in everyday driving.

  • +9++DRY TRACTION
  • +8++WET TRACTION
  • +7.5++TREADWEAR
  • +6.5++QUIET
  • +7++HANDLING
  • +6++WINTER TRACTION
  • +10++OFF-ROAD
About the Performance Ratings

Tire Sizes and Specifications

Discoverer STT Pro
Tire Size Service Description UTQG Load Range Sidewall Approved Rim Width Measured Rim Width Section Width Overall Diameter Tread Width Max Load Tread Depth (1/32")
30X9.50R15LT 104Q C RWL 6.5 - 8.5 7.5 9.6 29.57 7.72 1985 19
31X10.50R15LT 109Q C RWL 7 - 9 8.5 10.7 30.75 8.5 2270 20
32X11.50R15LT 113Q C RWL 8 - 10 9 11.7 31.57 9.09 2535 20
33X12.50R15LT 108Q C RWL 8.5 - 11 10 12.2 32.72 9.8 2205 21
35X12.50R15LT 113Q C RWL 8.5 - 11 10 13.1 34.57 10.08 2535 21
LT215/85R16 115\112Q E BLK 5.5 - 7 6 8.5 30.59 6.34 2680 18.5
LT235/85R16 120\116Q E BLK 6 - 7.5 6.5 9.6 31.89 7.13 3042 18
LT225/75R16 115\112Q E BLK 6 - 7 6 8.9 29.49 7.05 2680 18
LT245/75R16 120\116Q E BLK 6.5 - 8 7 9.6 30.71 7.52 3042 18
LT265/75R16 123\120Q E RWL 7 - 8 7.5 10.7 31.89 8.43 3415 18.5
LT285/75R16 126\123Q E RWL 7.5 - 9 8 11.2 32.99 8.82 3750 19
LT315/75R16 127\124Q E RWL 8 - 11 8.5 12.6 34.53 9.69 3860 20.5
LT305/70R16 124\121Q E RWL 8 - 9.5 9 12.3 32.99 9.88 3525 19.5
LT255/75R17 111\108Q C RWL 6.5 - 8.5 7 10.3 31.89 8.11 2405 19
LT265/70R17 121\118Q E RWL 7 - 8.5 8 10.7 31.93 8.5 3195 18.5
LT285/70R17 121\118Q E RWL 7.5 - 9 8.5 11.5 33.03 8.98 3195 19
LT295/70R17 121\118Q E RWL 7.5 - 10 8.5 12 33.46 9.69 3195 21
LT315/70R17 121\118Q E RWL 8 - 11 9.5 12.6 34.57 10 3195 21
LT305/65R17 121\118Q E BLK 8.5 - 11 9 12.3 32.68 9.88 3195 21
37X12.50R17LT 124Q D BLK 8.5 - 11 10 13 36.77 10.2 3525 22
37X13.50R17LT 121Q E BLK 8.5 - 11 11 13.3 36.77 10.98 3195 22
LT275/70R18 125\122P E RWL 7 - 8.5 8 11.3 33.31 9.09 3640 20
LT295/70R18 129\126P E RWL 7.5 - 10 8.5 12 34.49 9.69 4080 21
LT305/70R18 126\123Q E RWL 8.5 - 10 9 12.4 35.08 9.88 3750 21
LT275/65R18 123\120Q E RWL 7.5 - 9 8 10.9 32.28 8.82 3415 19
LT285/65R18 125\122Q E RWL 8 - 10 8.5 11.8 32.91 9.49 3640 19
LT325/65R18 127\124Q E RWL 9 - 12 9.5 13.7 34.69 11.1 3860 21
LT305/60R18 121\118Q E RWL 8.5 - 11 9 12 32.68 10.08 3195 21
37X13.50R18LT 124Q D BLK 8.5 - 11 11 13.3 36.77 10.98 3525 22
LT275/65R20 126\123Q E BLK 7.5 - 9.5 8 10.9 34.49 9.09 3750 19
LT295/65R20 129\126Q E BLK 8 - 10 8.5 11.7 35.43 9.65 4080 19.5
LT295/60R20 126\123Q E BLK 8 - 10 8.5 11.5 34.29 9.65 3750 19.5
LT295/55R20 123\120Q E BLK 8 - 10 9.5 12.3 33.07 10.2 3415 20
LT305/55R20 121\118Q E BLK 8.5 - 11 9.5 12.4 33.5 10.43 3195 20.5
35X12.50R20LT 121Q E BLK 8.5 - 11 10 12.4 34.69 10.2 3195 21
37X12.50R20LT 126Q E BLK 8.5 - 11 10 12.6 36.69 10.31 3750 21
35X13.50R20LT 122Q E BLK 8.5 - 11 11 13.2 34.57 11.1 3305 21
37X13.50R20LT 127Q E BLK 8.5 - 11 11 13.3 36.85 10.79 3860 21
LT325/50R22 122Q E BLK 9 - 12 10 12.9 35.12 11.38 3305 21
35X12.50R22LT 117Q E BLK 8.5 - 11 10 12.3 34.76 10.39 2835 21
37X13.50R22LT 123Q E BLK 8.5 - 11 11 13.4 36.89 10.79 3415 21
Tire Size Service Description UTQG Load Range Sidewall Approved Rim Width Measured Rim Width Section Width Overall Diameter Tread Width Max Load Tread Depth (1/32")
30X9.50R15LT 104Q C RWL 245 751 196 900 15.2
31X10.50R15LT 109Q C RWL 272 781 216 1030 15.8
32X11.50R15LT 113Q C RWL 297 802 231 1150 15.8
33X12.50R15LT 108Q C RWL 310 831 249 1000 16.6
35X12.50R15LT 113Q C RWL 332 878 256 1150 16.6
LT215/85R16 115\112Q E BLK 215 777 161 1215 14.7
LT235/85R16 120\116Q E BLK 243 810 181 1380 14.3
LT225/75R16 115\112Q E BLK 225 749 179 1215 14.2
LT245/75R16 120\116Q E BLK 245 780 191 1380 14.3
LT265/75R16 123\120Q E RWL 273 810 214 1550 14.8
LT285/75R16 126\123Q E RWL 284 838 224 1700 15.1
LT315/75R16 127\124Q E RWL 320 877 246 1750 16.2
LT305/70R16 124\121Q E RWL 313 838 251 1600 15.4
LT255/75R17 111\108Q C RWL 262 810 206 1090 15.2
LT265/70R17 121\118Q E RWL 272 811 216 1450 14.8
LT285/70R17 121\118Q E RWL 292 839 228 1450 15.2
LT295/70R17 121\118Q E RWL 306 850 246 1450 16.6
LT315/70R17 121\118Q E RWL 321 878 254 1450 16.6
LT305/65R17 121\118Q E BLK 312 830 251 1450 16.6
37X12.50R17LT 124Q D BLK 329 934 259 1600 17.5
37X13.50R17LT 121Q E BLK 339 934 279 1450 17.5
LT275/70R18 125\122P E RWL 288 846 231 1650 16
LT295/70R18 129\126P E RWL 304 876 246 1850 16.6
LT305/70R18 126\123Q E RWL 316 891 251 1700 16.6
LT275/65R18 123\120Q E RWL 277 820 224 1550 15.1
LT285/65R18 125\122Q E RWL 300 836 241 1650 15.1
LT325/65R18 127\124Q E RWL 348 881 282 1750 16.6
LT305/60R18 121\118Q E RWL 304 830 256 1450 16.6
37X13.50R18LT 124Q D BLK 339 934 279 1600 17.5
LT275/65R20 126\123Q E BLK 278 876 231 1700 15.2
LT295/65R20 129\126Q E BLK 298 900 245 1850 15.4
LT295/60R20 126\123Q E BLK 293 871 245 1700 15.4
LT295/55R20 123\120Q E BLK 313 840 259 1550 16
LT305/55R20 121\118Q E BLK 316 851 265 1450 16.4
35X12.50R20LT 121Q E BLK 315 881 259 1450 16.6
37X12.50R20LT 126Q E BLK 320 932 262 1700 16.7
35X13.50R20LT 122Q E BLK 336 878 282 1500 16.7
37X13.50R20LT 127Q E BLK 338 936 274 1750 16.6
LT325/50R22 122Q E BLK 327 892 289 1500 16.7
35X12.50R22LT 117Q E BLK 313 883 264 1285 16.7
37X13.50R22LT 123Q E BLK 341 937 274 1550 16.7