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Cooper Discoverer ATP II
Upgrade your truck or SUV with the Cooper Discoverer ATP II LT275/70R18 125S E1 RWL, an exclusive all-terrain tire built for pickups and SUVs that need confident off-road traction, wet-road control, and steady highway manners. This LT275/70R18 Discoverer ATP II is a popular fitment for select Ram 2500, Chevrolet Silverado 2500HD, GMC Sierra 2500HD, Toyota Tundra, Ford F-250, Ford F-350 models, plus similar heavy-duty pickups, work trucks, towing setups, and trail-ready SUVs using 18-inch wheels.
Best for: work trucks, overlanding builds, and weekend adventure vehicles that need year-round all-terrain confidence with LT-rated strength for towing, hauling, and rough-road use, especially in a LT275/70R18 size with 125S E1 capability.
Why choose the Cooper Discoverer ATP II in LT275/70R18?
All-terrain traction: Alternating shoulder scallops and wide off-road shoulder tread blocks help the ATP II dig into loose terrain like dirt, mud, gravel, and sand.
Wet and winter-road control: Wet Grip Grooves and Snow Claw technology help support grip on rainy pavement, slushy roads, and light winter conditions.
Durability for truck use: Stone Ejector Ledges help reduce stone retention, while rugged shoulder lugs add traction in aired-down driving and help resist damage away from pavement.
Highway stability: A solid center rib, stable tread area, interlocking sipes, and durable tread compound help deliver predictable handling and long-lasting all-terrain performance.
Comfort and warranty: Proprietary tread block sizing and spacing support a smoother, quieter ride, and the Cooper Discoverer ATP II is backed by a 60,000-mile manufacturer's treadwear warranty.
Popular vehicle fitments for LT275/70R18 Cooper Discoverer ATP II
This tire size is commonly shopped for select trims or replacement applications of the Ram 2500, Chevrolet Silverado 2500HD, GMC Sierra 2500HD, Toyota Tundra, Ford F-250, and Ford F-350. It is also a strong all-terrain option for comparable vehicles that use the same tire size, load range, speed rating, wheel diameter, and sidewall designation.
Size and rating details
LT275/70R18: This size is designed for 18-inch wheels and is a practical choice for drivers who need LT-rated strength for towing, hauling, off-road travel, and work-truck duty.
125S E1: The LT construction and 125S E1 service description are built for heavier-duty truck and SUV applications that see towing, hauling, gravel roads, and jobsite use.
RWL: This version uses raised white lettering sidewall styling.
Speed capability: This size carries S-rated speed capability for truck and SUV applications that balance all-terrain utility with highway use.
Frequently asked questions
Is the Cooper Discoverer ATP II LT275/70R18 an all-terrain tire?
Yes. The Discoverer ATP II is an all-terrain tire for pickups and SUVs, built to balance off-road traction, pavement stability, wet-road grip, and everyday ride comfort.
Is the Cooper Discoverer ATP II LT275/70R18 good for wet roads and light snow?
It is designed with Wet Grip Grooves and Snow Claw technology to help with rainy pavement, slush, and light winter driving, while still keeping the rugged traction expected from an all-terrain tire.
What vehicles use the Cooper Discoverer ATP II LT275/70R18?
Popular applications include select Ram 2500, Chevrolet Silverado 2500HD, GMC Sierra 2500HD, and Toyota Tundra models, along with similar trucks and SUVs using the same size, load range, speed rating, wheel diameter, and sidewall designation.
Is the Cooper Discoverer ATP II LT275/70R18 good for towing, hauling, or jobsite use?
The LT construction and 125S E1 service description are built for heavier-duty truck and SUV applications that see towing, hauling, gravel roads, and jobsite use. Its all-terrain tread, center rib stability, and shoulder-lug design make it a strong choice for drivers who want truck-ready durability with on-road control.
What warranty comes with the Cooper Discoverer ATP II?
The Cooper Discoverer ATP II is backed by a 60,000-mile manufacturer's treadwear warranty, giving pickup and SUV drivers extra confidence in its long-lasting all-terrain performance.
| SECTION WIDTH Measures the width of the tire from sidewall to sidewall, which is mounted on a wheel and inflated. | 245 - 285 |
| ASPECT RATIO Determines the sidewall height of the tire, based on the width. | 55 - 75 |
| RIM DIAMETER Measures the rim size from top to bottom (in inches). | 16" - 20" |
| OVERALL DIAMETER Measures the tire height from top to bottom when mounted on a wheel and inflated. | 30.63" - 34.21" |
| RIM WIDTH RANGE The approved range of rim widths this tire can be safely mounted on. | 6.5" - 9.5" |
| WEIGHT The weight of the tire measured in pounds (weight of tire only). | 40.59 LBS - 61.0 LBS |
| TREAD DEPTH Measured in /32 of an inch to determine the height of the tread block from top to bottom. | 12" - 17" |
| LOAD INDEX Determines the weight a tire can carry at maximum air pressure. See load Index chart. | 112 - 126 |
| LOAD RANGE Determines the ply rating of the tire. Should be replaced with the same or higher rating. | E1 - XL |
| MAX PSI The max psi is the highest pressure the tire can hold, but should be inflated to your vehicle specifications not exceeding this amount. | 44 PSI - 80 PSI |
| SPEED RATING Designation from laboratory testing to determine the maximum speed the tire can travel. Maintain the same speed rating or higher for replacement. | H - Up to 130 mph - T - Up to 118 mph |
| SIDEWALL DESC. The sidewall designation to describe the lettering on the sidewall. | Black Side Wall - Raised White Lettering |
| WARRANTY Estimates the life expectancy of the tire, set by the tire manufacturer. | 60000 |
| VPN Vendor Product Number | 170190020 - 171318059 |
Customer Reviews
Wearing much too fast
Sidewalls are soft, makes the truck seem a little squirrelly in curves.