Cooper Tires

Cooper Discoverer Rugged Trek LT275/70R18 E/10PLY BSW Tires

Rims Not Included

Per Tire:
$ 378.73
$ 315.61
Estimated Delivery
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  • MFG: 90000036406
  • Load Range/Ply Rating: E/10PLY
  • Mileage Warranty: 55000 miles
  • Availability:
    In Stock
tire tooltip Price Match: Click Here
This listing is for new Cooper Discoverer Rugged Trek LT275/70R18 E/10PLY BSW Tires. Manufacturer part number: 90000036406. The Cooper Discoverer Rugged Trek is an all season truck and SUV tire for off road explorers who also want a tire with excellent on road manners too. With its aggressive, deep tread pattern to handle the off road conditions easily, the Rugged Trek is built for long milage and comfort on road trips. It comes equipped with Cooper Whisper Grooves to reduce high speed noise that is common in more aggressive truck tires. It has excellent grip and the Stable Trac Technology optimizes stability and control, while the omni-directional sipes further promote traction on roads and varied off road surfaces. The alternating angle tread blocks have biting edges for enhanced grip and wide grooves to quickly evacuate water, slush or loose materials. Customize your sidewall by picking from one of the two different patterns on the tire. Both patterns have long, deep clears for off road traction and bold black, raised lettering. The Discoverer Rugged Trek has it all, aggressive traction and stability while still providing smooth, quiet on road manners.
Specs: Value: Description:
Sidewall BSW
Describes the sidewall appearance. Examples: BSW= Black Side Wall, WSW = White Side Wall OWL = Outlined White Letters.
Load Index 125/122
The load index (LI) is a 2 or 3 digit number that corrolates to the maximum amount of weight the tire can carry. For example, a tire with a load index of 87 indicates that the tire can carry a maximim load of 1,201 lbs. In the case of our example the 87 identifies the tires ability to carry a maximum of 1,201 lbs. So 4 tires will carry a maximum of 4,804 lbs. Refer to your vehicle owner's manual for the recommended minimim Load Index. It is not recommended to install tires with a lower Load Index. By doing so, this could cause your tires to be overloaded thus potentially causing a blowout.
Speed Rating Q
Speed Ratings (SR) are based on laboratory tests and indicates the maximum speed the tire can achieve. These tests are based on limited time trials. Higher speed rating tires typically will yield better handling capabilities, but may often result in lower mileage. Refer to your vehicle owner's manual for the recommended minimum Speed Rating. It is not recommended to install a tire with a lower speed rating as it could affect the handling of your vehicle. It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded. Additionally, most tire manufacturers maintain that a tire that has been cut or punctured no longer retains the tire manufacturer's original speed rating, even after being repaired because the tire manufacturer can't control the quality of the repair.
Load Range/Ply Rating E/10PLY
Ply Rating is related to the max load capacity. This value can be defined with a letter or number. The higher the number/letter, the higher the load capacity.
UTQG Not Available
To help consumers evaluate their tires, the U.S. National Highway Traffic Safety Administration (NHTSA) created the Uniform Tire Quality Grading System (UTQG). The UTQG rates tires are rated on their tread-wear, traction performance, and temperature resistance. The grade for each of these can be found on the sidewall of your tire (except for winter tires and certain light truck tires). Click here for more information.
Max Single Load(lbs) 3640 The maximum load this tire will support. Remember to multiply this number by the number of tires installed on your vehicle to get the maximum carrying capacity. This number is directly related to the Load Index.
Max Single Air Pressure(PSI) 80 The maximum air pressure this tire will support. This does not represent the amount of air pressure your tires should have at all times. Consult with your owner's manual to determine the best air pressure you should use for your vehicle.
Tread Depth 18.5 The amount of tread on the tire. Once the tire is worn to 2/32nds, it is considered fully used and should be replaced at that time. Most tires will have tire indicators in the grooves of the tire to help you determine when the tires are worn down to 2/32nds.
Tread Design Nondirectional
Nondirectional - most common, same tread pattern on inside & outside of the tire. Can be rotated to all four corners of vehicle.
Asymmetrical - tread pattern is different on the inside to the outside of the tire, and must be mounted properly. Can be rotated to all four corners of the vehicle.
Directional tires - roll in only one direction, must be mounted properly. Once mounted they must remain on the same side of the vehicle, and only be rotated front to rear.
Rim Width Range 7.0-9.0 The approved wheel rim width range this tire will support.
Measured Rim Width 8.0 The recommended wheel width as recommended by the tire manufacturer to get the best wear us performance for this tire.
Section Width 11.1 The measurement from sidewall to sidewall.
Tread Width Not Available The measurement from one side of the tread to the other side of the tread.
Overall Diameter 33.7 The height of the tire when fully inflated.
Manufacturer Part Number 90000036406 Manufacturer part number (sku)


Shipping rates and estimated delivery times are available on tires after setting your delivery zip code. Tires ship via FedEx Ground and the shipment times are a very good estimate, although not an exact number of time-in-transit days. Tires are delivered Monday - Saturday. FedEx does not pick up orders on weekends or certain holidays. Once the tires are picked up, the time-in -transit estimate begins. If you place your order Friday afternoon, or on the weekend, your tires it will not ship until the following week. Currently we only offer FedEx Ground, expedited shipping is not available. Depending on when you place your order, there may be one, possibly two days of processing time. Shipping delivery times can be impacted by weather events across the country.

You can choose between 3 delivery options:

  • 1. Your tires can be delivered directly to your billing address.
  • 2. Your tires can be delivered to an alternate address. In this case, please specify the delivery address and the person authorized to receive the tires on your behalf.
  • 3. The tires can be delivered directly to a Tire Installer of your choice. Please enter the address of the Tire Installer in the "Ship To" address and be sure to coordinate acceptance of your shipment from

You will receive an e-mail confirmation of the transaction when you place your order. Please save a printed copy of your order confirmation for your records.


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Return/Refund Policy

See General Terms and Conditions for additional Return/Refund details

Size Load Index/ Speed index UTQG Load Range/Ply Rating Overall Diameter Section Width Rim Width Min Rim Width Max Rim Width Meas Tread Depth (in) Max Single Air Pressure (PSI) Max Single Load (lbs) Max Dual Air Pressure (PSI) Max Dual Load (lbs) MFG #
35X12.50R20 125Q - F/12PLY 34.9 12.6 8.5 11.0 10.0 18.5 80 3640 - - 90000036436
255/70R18 116T 600AB 32.4 10.2 6.5 8.5 7.5 16.0 50 2756 - - 90000038359
265/50R20 111T 600AB 30.4 10.7 7.5 9.5 8.5 16.0 50 2403 - - 90000038400
265/60R18 114T 600AB 30.8 10.6 7.5 9.5 8.0 16.0 50 2601 - - 90000038401
LT265/60R20 121/118Q - E/10PLY 32.9 10.6 8.0 9.5 8.0 18.5 80 3195 80 2910 90000038335
265/65R18 116T 600AB 31.5 10.7 7.5 9.5 8.0 16.0 50 2756 - - 90000036540
265/70R16 112T 600AB 30.8 10.5 7.0 9.0 8.0 16.0 44 2469 - - 90000036536
LT265/70R17 121/118Q - E/10PLY 32.0 10.6 7.0 9.0 8.0 18.5 80 3195 80 2910 90000036420
265/70R17 116T 600AB 31.9 10.4 7.0 9.0 8.0 16.0 50 2756 - - 90000036533
275/55R20 117T 600AB 32.2 11.1 7.5 9.5 8.5 16.0 50 2833 - - 90000036538
275/60R20 115T 600AB 33.4 10.8 7.5 9.5 8.0 16.0 44 2679 - - 90000036534
275/65R18 116T - - - - - - - - - - - 171170019
LT275/65R18 123/120Q - E/10PLY 32.6 10.9 7.5 9.0 8.0 18.5 80 3415 80 3085 90000036434
LT275/65R20 126/123Q - E/10PLY 34.7 11.5 8.0 9.5 8.0 18.5 80 3750 80 3415 90000036433
LT275/70R18 125/122Q - E/10PLY 33.7 11.1 7.0 9.0 8.0 18.5 80 3640 80 3305 90000036406
285/45R22 114T 600AB 32.3 11.3 9.0 10.5 9.5 16.0 50 2601 - - 90000038402
LT285/55R20 122/119Q - E/10PLY 32.8 11.5 8.5 10.0 9.0 18.5 80 3305 80 3000 90000038334
285/70R17 116T - - - - - - - - - - - 171169019
LT285/70R17 121/118Q - E/10PLY 33.0 11.5 7.5 9.5 8.5 18.5 80 3195 80 2910 90000036430
LT305/55R20 125/122Q - F/12PLY 33.4 12.5 9.0 11.0 9.5 18.5 80 3640 80 3305 90000038333