Cooper
Discoverer Rugged Trek
255/70R18 XL
All-Season
M+S
$208.49/tire
$277.99
Set of 4: $833.96
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Specifications
| Size | 255/70R18 XL Discoverer Rugged Trek |
|---|---|
| Width | 255 mm |
| Aspect ratio | 70 |
| Rim diameter | R18 |
| Load index | 116 |
| Speed rating | T |
| Load range | XL |
| Season | All-Season |
|---|---|
| UTQG | 600 A B |
| Treadwear warranty | 60,000 miles |
| Tread depth | 16/32" |
| Weight | 45.15 lbs |
| Max pressure | 50 psi |
| Severe snow (3PMSF) | No |
| Run-flat | No |
About the Cooper Discoverer Rugged Trek
All-Season Mud-Terrain Passenger Light Truck/SUV tire.
Features
* Dual off-road sidewalls, both sides offering long, deep cleats* Earth Diggers™ Technology with large shoulder scoops and lugs* Jutting ridges expel lodged stones* Stable Trac™ Technology - omni-directional, micro-gauge siping* Whisper Grooves™ Technology - specially designed sound barrier walls* M+S Rated* Free 45-Day Test Drive* 60,000 Mile Limited Treadwear Warranty - (Non-LT Sizes Only)
Benefits
* Enhance off road traction* Combine to forcefully dig into dirt, sand and mud* Protect against damage from sharp rocks* Enhances traction on roads and rough surfaces, improving stability and control* Reduce road noise
Understanding the 255/70R18 XL size
In the size code 255/70R18, 255 is the section width in millimetres (about 10"). 70 is the aspect ratio — the sidewall height is 70% of the width, or roughly 178.5 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 32.1".
The load index 116 means each tire supports up to 2,756 lbs — about 11,024 lbs across a full set of four. The speed symbol T certifies the tire to 118 mph under its rated load. Always match or exceed the load index and speed rating listed on your vehicle's door-jamb placard.
What the Cooper Discoverer Rugged Trek is built for
The Cooper Discoverer Rugged Trek is an all-season tire, balancing dry grip, wet traction and tread life across spring, summer and autumn conditions. It carries an M+S (mud and snow) marking for light winter service. It is classified for mud-terrain (m/t) use.
Tread life and grip ratings
This tire carries a UTQG rating of 600 A B. The treadwear grade of 600 is a relative durability score — a grade of 200 is expected to last roughly twice as long as a grade of 100 under the same controlled test. Traction grade A measures straight-line wet stopping grip (AA is highest, then A, B and C). Temperature grade B reflects heat resistance at sustained speed (A is highest).
Price and value
At $208.49 per tire, a full set of four costs $833.96. That is about 13% above the average of the 66 tires we stock in this size, reflecting its position in the range. Backed by a 60,000-mile treadwear warranty, that works out to roughly $13.90 per 1,000 miles across the set.
Frequently asked questions
What does the tire size 255/70R18 mean?
255 is the section width in millimetres, 70 is the aspect ratio (sidewall height as a percentage of width, about 178.5 mm), and R18 indicates radial construction for a 18-inch wheel. Overall diameter is approximately 32.1 inches.
What are the load and speed ratings of the Cooper Discoverer Rugged Trek 255/70R18 XL?
Its load index of 116 allows up to 2,756 lbs per tire. Its speed rating of T is certified to 118 mph. Check your door-jamb placard and do not fit a tire rated below the vehicle's requirement.
How much does a set of 4 Cooper Discoverer Rugged Trek 255/70R18 XL tires cost?
A single tire is $208.49 and a set of four is $833.96, covered by a 60,000-mile treadwear warranty.
Does the Discoverer Rugged Trek come in other sizes?
Yes — we stock 10 additional Discoverer Rugged Trek sizes besides 255/70R18 XL. Fit only a size approved for your vehicle.
