Cooper Discoverer Rugged Trek LT LT285/55R20 E Discoverer Rugged Trek LT
Cooper

Discoverer Rugged Trek LT

LT285/55R20 E
All-Season M+S
$330.74/tire $440.99
Set of 4: $1322.96
Minimum order: 4 tires (sizes can be mixed) ? Selling in sets of 4 is how we keep our prices this low — and a matching set keeps your car balanced and safe.
Most drivers replace all four for even wear and handling.
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Specifications

SizeLT285/55R20 E Discoverer Rugged Trek LT
Width285 mm
Aspect ratio55
Rim diameterR20
Load index122/119
Speed ratingQ
Ply rating10
SeasonAll-Season
Treadwear warranty55,000 miles
Tread depth18.5/32"
Weight61.14 lbs
Max pressure80 psi
Severe snow (3PMSF)No
Run-flatNo

About the Cooper Discoverer Rugged Trek LT

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* 55,000 Mile Limited Treadwear Warranty - (LT sizes)

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 LT285/55R20 E size

In the size code 285/55R20, 285 is the section width in millimetres (about 11.2"). 55 is the aspect ratio — the sidewall height is 55% of the width, or roughly 156.8 mm. R20 means radial construction on a 20-inch wheel, giving an approximate overall diameter of 32.3".

The load index 122 means each tire supports up to 3,307 lbs — about 13,228 lbs across a full set of four. The speed symbol Q certifies the tire to 99 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 LT is built for

The Cooper Discoverer Rugged Trek LT 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.

Price and value

At $330.74 per tire, a full set of four costs $1322.96. That sits close to the average for the 53 tires we stock in this size. Backed by a 55,000-mile treadwear warranty, that works out to roughly $24.05 per 1,000 miles across the set.

Frequently asked questions

What does the tire size 285/55R20 mean?

285 is the section width in millimetres, 55 is the aspect ratio (sidewall height as a percentage of width, about 156.8 mm), and R20 indicates radial construction for a 20-inch wheel. Overall diameter is approximately 32.3 inches.

What are the load and speed ratings of the Cooper Discoverer Rugged Trek LT LT285/55R20 E?

Its load index of 122 allows up to 3,307 lbs per tire. Its speed rating of Q is certified to 99 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 LT LT285/55R20 E tires cost?

A single tire is $330.74 and a set of four is $1322.96, covered by a 55,000-mile treadwear warranty.

Does the Discoverer Rugged Trek LT come in other sizes?

Yes — we stock 31 additional Discoverer Rugged Trek LT sizes besides LT285/55R20 E. Fit only a size approved for your vehicle.

Other sizes of this model

Similar tires in 285/55R20

Toyo Open Country C/T LT285/55R20 E Open Country C/T
Toyo
Open Country C/T
LT285/55R20 E
All-Weather 3PMSF
$345.36/tire
$1381.44 set of 4