Cooper Discoverer HT3 LT275/70R18 E Discoverer HT3
Cooper

Discoverer HT3

LT275/70R18 E
All-Season M+S
$218.24/tire $290.99
Set of 4: $872.96
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

SizeLT275/70R18 E Discoverer HT3
Width275 mm
Aspect ratio70
Rim diameterR18
Load index125/122
Speed ratingS
Ply rating10
SeasonAll-Season
Treadwear warranty50,000 miles
Tread depth14.5/32"
Weight52.01 lbs
Max pressure80 psi
Severe snow (3PMSF)No
Run-flatNo

About the Cooper Discoverer HT3

All-Season Commercial Light Truck/Van Highway Rib tire.

Features

* Four wide circumferential grooves combined with a silica compound* Continuous shoulder ribs* 3D micro-gauge™ siping* Tread design that repels stone and debris* M+S Rated* Free 45-Day Test Drive* 50,000 Mile Treadwear Protection Warranty

Benefits

* Provides better wet traction and handling* Provides superior resistance to irregular wear for longer life and a quieter ride* Helps maintain wet traction and stability* For greater traction

Understanding the LT275/70R18 E size

In the size code 275/70R18, 275 is the section width in millimetres (about 10.8"). 70 is the aspect ratio — the sidewall height is 70% of the width, or roughly 192.5 mm. R18 means radial construction on a 18-inch wheel, giving an approximate overall diameter of 33.2".

The load index 125 means each tire supports up to 3,638 lbs — about 14,552 lbs across a full set of four. The speed symbol S certifies the tire to 112 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 HT3 is built for

The Cooper Discoverer HT3 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 highway terrain(h/t) use.

Price and value

At $218.24 per tire, a full set of four costs $872.96. That is about 10% below the average price of the 105 tires we stock in this size. Backed by a 50,000-mile treadwear warranty, that works out to roughly $17.46 per 1,000 miles across the set.

Frequently asked questions

What does the tire size 275/70R18 mean?

275 is the section width in millimetres, 70 is the aspect ratio (sidewall height as a percentage of width, about 192.5 mm), and R18 indicates radial construction for a 18-inch wheel. Overall diameter is approximately 33.2 inches.

What are the load and speed ratings of the Cooper Discoverer HT3 LT275/70R18 E?

Its load index of 125 allows up to 3,638 lbs per tire. Its speed rating of S is certified to 112 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 HT3 LT275/70R18 E tires cost?

A single tire is $218.24 and a set of four is $872.96, covered by a 50,000-mile treadwear warranty.

Does the Discoverer HT3 come in other sizes?

Yes — we stock 17 additional Discoverer HT3 sizes besides LT275/70R18 E. Fit only a size approved for your vehicle.

Other sizes of this model

Similar tires in 275/70R18

GT Radial Adventuro ATX LT275/70R18 E Adventuro ATX
GT Radial
Adventuro ATX
LT275/70R18 E
3PMSF
$198.74/tire
$794.96 set of 4