Cooper 225 75r16

Cooper 225 75r16 DEFAULT

Discoverer HT3

Bought the Discoverer HT3 to replace the BFG Rugged Trail on my 2005 Dodge 3500 4x4. This is strickly a towing rig used for an RV, a 3 horse trailer with LQ, and some ranch work. Most of the time it is on paved roads with a little bit of driving on gravel, grass and dirt roads.

The BFG tires were OK but tended to wander and they were terrible in the snow. I've found the Discoverer HT3 to track and handle better! The tires are also quiet. Wet traction and stopping is very good.

I don't put a lot of miles on this truck and rarely drive it during winter... but after a year of use, the treadwear is looking good and the tires are better in snow than the BFGs.

Overall I am very pleased with the HT3 and based on my experience can highly recommend it as a good tire for towing.

  • Recommends this product
  • ✔Yes
Originally posted on


225/75R16 104T


  • Adaptive-Traction Technology
  • Micro-Gauge zigzag sipes
  • Patented saw-tooth technology
  • Aqua Vac channels
  • Secure-Grip all-terrain tread pattern


  • Outstanding off-road performance
  • Smooth on-highway ride
  • Quick braking and acceleration on snowy roads
  • Reduced stone retention


  • Speed Rating MPH


  • Load Index


  • Load Range

    SL - Standard Load

  • Uniform Tire Quality Rating

    620 A B

  • Seasonality


  • Sidewall Markings

    OWL - Outline White Letters

  • Maximum Load


  • Maximum Inflation Pressure


  • Run-Flat


  • Tread Depth


  • Net Weight


  • Measured Rim Width


  • Section Width


  • Tread Width


  • Overall Diameter


  • Revolutions Per Mile


  • Country of Origin

    US - USA

  • Terrain


  • Performance


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Cooper Discoverer AT3 4S 225/75R16 104T WL Tires

Sidewall WL

This describes the sidewall appearance. Examples include Black Sidewall, White Sidewall, and White Letters.

Load Index 104

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.... read moreread less

Speed Rating T

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.... read moreread less

Ply Rating Not Available

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.


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.... read moreread less

Max Single Load(lbs) 1984The 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) 44The 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 13.5The 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 Not Available

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.... read moreread less

Rim Width Range 6.0-7.5The approved wheel rim width range this tire will support.Measured Rim Width 6.0The recommended wheel width as recommended by the tire manufacturer to get the best wear us performance for this tire.Section Width 8.6The measurement from sidewall to sidewall.Tread Width Not AvailableThe measurement from one side of the tread to the other side of the tread.Overall Diameter 29.13The height of the tire when fully inflated.Manufacturer Part Number 90000032683Manufacturer part number (sku)

Discoverer AT3 LT

Speed Rating:

The speed rating is a measure of what speed the tire can safely maintain for sustained periods of time. A higher speed rating will generally indicate that you will have better control and handling characteristics. Speed rating standards are established by the U.S. Department of Transportation (DOT). Manufacturers assign speed ratings to tires after extensive performance testing. On the sidewall of every tire, you’ll find one of these speed rating codes:

M – Up to 81 mph
N – Up to 87 mph
P – Up to 93 mph
Q – Up to 99 mph
R – Up to 106 mph
S – Up to 112 mph
T – Up to 118 mph
H – Up to 130 mph
V – Up to 149 mph
W – Up to 168 mph
Y – Up to 186 mph
Z – (See Below)

What does ‘Up to 99 mph’ really mean?
Tires with a Q speed rating can safely sustain speeds of up to 99 miles per hour. The tire may be able to reach higher speeds, but traveling at speeds higher than 99 mph for any length of time would be unsafe - the tire is not designed to handle it.

What is a Z Rating?
For tires having a maximum speed capability above 149 mph, a Z rating may appear in the size designation ...above 186 mph, a Z rating must appear in the size designation, including a Y speed symbol in brackets.

A Few Tips About Speed Ratings…
Never mix tires with different speed ratings, as this may cause serious handling problems.

We don’t recommend downgrading the speed rating of your tires, as the vehicle manufacturer has done extensive testing to determine which tires match the various driving characteristics of the vehicle. However, if you are looking for better handling, there is generally no problem in moving up to a higher speed-rated tire.

Most importantly: Put safety first. The speeds shown are test speeds; they are not recommended speeds.


75r16 cooper 225

Cooper Discoverer AT3 LT - 225/75R16

The Discoverer AT3 LT is an all-terrain tire built to haul heavy loads and withstand constant punishment from dirt, gravel and other harsh off-road environments. Designed to prevent damage on rocky and gravel terrain stone ejector ledges help maintain a clean tread and enhance traction. With engineered tire shape technology the Discoverer AT3 LT was designed to evenly contact the road which promotes longer tread life and superior handling.

The 225/75R16 Cooper Discoverer AT3 LT has a diameter of 29.33", a width of 8.5", mounts on a 16" rim and has 709 revolutions per mile. It weighs 39 lbs, has a max load of 2680/2470 lbs, a maximum air pressure of 80 psi, a tread depth of 16.5/32" and should be used on a rim width of 6-7".

See all Discoverer AT3 LT tire sizesWrite a Review

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