Contender ST225/75R15 Radial Trailer Tire w/ 15" Silver Mod Wheel - 6 on 5-1/2 - Load Range D

Contender ST225/75R15 Radial Trailer Tire w/ 15" Silver Mod Wheel - 6 on 5-1/2 - Load Range D

Item # AC225R6SMQ

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Our Price: $142.25

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Shipping Weight: 48 lbs

Arrives before Christmas with Ground or Free Shipping.
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Product Images

Radial tire has 8-ply rating and a 2,540-lb max load at 65 psi. 15" x 6" Steel wheel has a 6 on 5-1/2 bolt pattern. Rust-resistant powder coat finish. Beveled stud holes secure wheel. Complimentary roadside assistance included. Lowest Prices for the best tires and wheels from Taskmaster. Contender ST225/75R15 Radial Trailer Tire w/ 15" Silver Mod Wheel - 6 on 5-1/2 - Load Range D part number AC225R6SMQ can be ordered online at or call 800-298-8924 for expert service.
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  • Q & A (13)
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  • Why etrailer?

Taskmaster Tires and Wheels - AC225R6SMQ

  • Tire with Wheel
  • 15 Inch
  • 6 on 5-1/2 Inch
  • 225/75-15
  • Load Range D
  • Steel Wheels - Powder Coat
  • Radial Tire
  • Taskmaster
  • Standard Rust Resistance

Radial tire has 8-ply rating and a 2,540-lb max load at 65 psi. 15" x 6" Steel wheel has a 6 on 5-1/2 bolt pattern. Rust-resistant powder coat finish. Beveled stud holes secure wheel. Complimentary roadside assistance included.


  • Tire-and-wheel assembly is ideal for stock trailers, utility trailers, and campers
  • Steel wheel with modular design is sturdy and corrosion resistant
    • E-coat primer and silver powder coat finish resists rust
  • Beveled stud holes help to keep wheel securely in place on trailer hub
    • Eliminate the need for constant retightening of lug nuts
  • Radial tire is constructed with double steel belts and double polyester cords
    • Great for highway use
    • Nylon tread-firming belt overlays help prevent tread separation
    • Tread depth bars offer a quick visual indicator of tread wear
  • Special trailer tire design couples the strength of a bias tire with the durability and stability of a radial tire
    • Created specifically for trailers and not intended for use on other vehicles
  • 2-Year Platinum Plus warranty includes emergency tire change service and other benefits
  • Assembly meets DOT specifications and exceeds FMVSS


  • Rim dimensions: 15" diameter x 6" wide
  • Bolt pattern: 6 on 5-1/2"
  • Wheel bolt size: 1/2"-20
  • Wheel capacity: 2,830 lbs
  • Pilot diameter: 4.25"
  • Offset: 0
  • Tire size: ST225/75R15
    • Section width: 8.78"
    • Outer diameter: 28.31"
  • Tire capacity:
    • Load range: D
    • Ply rating: 8
    • Maximum load: 2,540 lbs at 65 psi
  • Tread depth: 8.4/32"
  • Max speed: 81 mph (speed rating M)
  • 2-Year limited warranty

Platinum Plus Warranty with Roadside Assistance

This tire-and-wheel assembly comes with a Platinum Plus warranty that includes complimentary roadside assistance for 2 years. If your trailer has a flat tire, call the help line and a technician will come change out the flat tire with your existing inflated spare tire. The service is available 24 hours a day, 7 days a week. In addition to the roadside assistance, this warranty also includes other benefits and services.

Beveled Stud Holes

The stud holes on this steel wheel are beveled to ensure that the wheel stays tight against your trailer hub. This also eliminates the need to constantly retorque the lug nuts.

Standard Trailer Tire Tread

Contender Tire Tread

The standard tread on these tires has solid, continuous ribs, and it has very few sipes (or thin grooves) cut into the rubber. These tires are designed for use on trailers, so they don't require the level of traction that would be needed on a vehicle that is braking or steering.

Contender radials have double polyester cords and double steel belts. A protective layer of nylon is wrapped around the steel belts to help prevent tread separation.

Radial Tires vs. Bias Tires

Radial tire vs bias tire graphic

Radial ply tires are designed for trailers that are towed on the highway. The cords on a radial tire are positioned at a 90-degree angle to the direction of travel so that they lay across the width of the tire from wheel lip to wheel lip. This construction prevents the cords from rubbing against one another when the tire flexes, unlike the cords on a bias ply tire. As a result, radial tires have less rolling resistance and heat buildup, which leads to a longer tread life and improved steering at higher speeds.

Determining the Bolt Pattern

The first number in the bolt pattern is the number of bolt holes. The second number denotes the diameter, in inches, of the circle on which the bolt holes sit.

Bolt Pattern - Odd

To determine the bolt-circle diameter on wheels with an odd number of bolt holes, measure from the center of any bolt hole to the point halfway between the two bolt holes directly across from the first. (Example: "5 on 4-1/2" means 5 bolt holes with 4-1/2" measured to a point halfway between the opposite bolt holes.)

Bolt Pattern - Even

On wheels with an even number of bolt holes, measure from the center of one bolt hole to the center of the hole directly across from it. (Example: "8 on 6-1/2" means 8 bolt holes with 6-1/2" from the center of one hole to the center of another on the opposite side.)

Bolt Pattern - Side

Measuring the distance from the center of one bolt hole on the wheel to the center of a bolt hole right next to it can also help to determine the bolt pattern.

  • If D = 2-5/8", then the bolt pattern is 5 on 4-1/2"
  • If D = 2-3/4", then the bolt pattern is 5 on 4-3/4"
  • If D = 3", then the bolt pattern is 5 on 5"
  • If D = 3-1/4", then the bolt pattern is 5 on 5-1/2"

AC225R6SMQ Taskmaster Contender ST225/75R15 Radial Tire with Silver Modular Rim - 6 on 5-1/2 - LR D

Replaces Taskmaster AC225R6SM

AC225R6SMQ Installation InstructionsInstallation Details AC225R6SMQ Installation instructions


Ask the Experts about this Taskmaster Tires and Wheels

Do you have a question about this Tires and Wheel?

  • Does Pilot Size Matter for 15 Inch Tire and Wheel Combo With 6 on 5-1/2 Inch Bolt Pattern
  • That's a good question although the pilot size will only matter if you are using hub-piloted wheels, which means the the wheel secures to the hub with bolts as opposed to lug nuts (lug-piloted wheel), or if the wheel itself has a smaller pilot hole than the hub. The 3-5/8 inch measurement you got is pretty common and it does sound like you are looking for a lug-piloted wheel, which is by far the most common. So for that you can absolutely use a ST225/75R15 or ST205/75R15 tire and...
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  • Determining The Right Wheel/Tire Combination Based On Bolt Pattern, Load Range, And Speed Rating
  • I have attached an article that helps with determining your bolt pattern. However, since you have six lugs on each wheel, that makes things easy. There is only one 6 bolt pattern and it is 6 on 5-1/2 inches. I've linked the page for all our 225/75-15 options for your convenience. When choosing the right wheel/tire combination for your needs, you will want to consider load range which gives you the weight capacity of each wheel/tire and the speed rating. If no speed rating is listed,...
    view full answer...

  • Can Load Range B Tires be Used on a Trailer Weighing 10,000 lbs
  • If you are talking about putting Load Range B tires on your 10,000 lbs trailer you will first need to determine how many axles you have. A Load Range B tire, like the Loadstar ST205/75D14 # AM3S414 has a max load rating of 1,430 lbs at 35 psi. Since you will be putting 2 tires on an axle even if you had 3 axles that would only give you a max load rating of 8,580 lbs so I do not advise using a Load Range B. For a trailer weight of 10,000 lbs you most likely have a tandem axle trailer....
    view full answer...

  • Tire Balance For Special Trailer Tires And Wheels
  • Tire balancing at many tire shops is done quickly and accurately with vehicle tires using a balancing machine that allows the operator to use the center hub for balancing. It centers the wheel by the hub and spins the tire allowing them to see where weights need to be added. This is possible based on the design of the wheel/rim and the tire. Special trailer tires are made differently with a stiff sidewall because the tires are made to roll only straight and not turn on a pivoting...
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  • Is It Okay For My Hub To Have A Smaller Pilot Than The Pilot Hole On My Wheel
  • Yes, that will be okay. Trailers are designed to have the lug nuts carry the load as opposed to the hub bore.
    view full answer...

  • Determining Wheel Fit And Offset For Greater Clearance On Inside Of Trailer To Sidewall
  • Wheel offset refers to the location of a wheel's rim in relation to the wheel's center. The rim can be centered on the wheel or it can be offset to either side. The position of the rim determines where the tire lines up - either closer to or farther from the vehicle or trailer on which it is mounted. Trailer wheels usually have zero offset, meaning that the rim of a trailer wheel lines up directly under the center of the wheel. This alignment puts the tire directly under the center...
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  • Inside of Tires are Balding on Rear Axle of Tandem Axle Trailer
  • It is odd that only the rear tires are balding on the inside and it isn't just one side or the other. From what you described it sounds like your rear axle, spindles, or wheels have been damaged. This could be the result of driving too fast over a good sized pothole or overloading the rear of your trailer enough that it maxed out the weight capacity of the rear axle. If you let me know the tire size and bolt pattern of your wheel I can make a recommendation for replacements, but I would...
    view full answer...

  • Are Trailer Tire And Wheel Combinations Balanced And What About Date Codes?
  • The tire and wheel combinations like # AC225R6SMQ are balanced as far as trailer tire balancing goes, which is different from vehicle tire balancing. With trailer wheels and tires, there is a high spot and a low spot that are labeld and placed opposite to balance the tire and wheel. There is not turning for trailer tires, so they have a stiff side wall and are balanced differently due to the way they are made. The combinations come ready for you to inflate to max tire pressure and install...nothing...
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  • Recommended Axles, Brakes, Hubs And Drums For 1998 Fourwinns 20 Foot Horizon Boat
  • Dexter does make a 4,000 lb axle, but unfortunately we do not carry them. I do have another option for you though. I recommend the Timbren Axle-Less Trailer Suspension System, # ASR5200S04. This axle-less system has a built in suspension and brake flange. The deflection or suspension travel is 2-3/4 inches. This axle-less system is nice in that it gives you more clearance in-between your wheels. For this system, I recommend the Trailer Hub and Drum Assembly - 5,200-lb Axles - 6...
    view full answer...

  • How to Determine Load Range of ST225/75R15 Trailer Tire
  • Size ST225/75R15 tires actually come in a few different load range ratings. If you check out the sidewalls of your tire, like the Contender # AC225R6SMQ, the load range should be listed. Please note that you want to run the same load range, size, and type (bias or radial) of tires to get the most consistent wear on them. Attached is a helpful article on tires and wheels that you may be interested in as well.
    view full answer...

  • Does the Dexter Trailer Hub Assembly 8-201-9UC3-EZ Come With 2 Assemblies or Just 1
  • The price that you see on the Trailer Hub Assembly # 8-201-9UC3-EZ is per hub. This item is the whole hub assembly so it comes with the bearings, grease cap, seal, wheel bolts and lug nuts. You will need to order 2 of these per axle on your trailer. The most popular tire and wheel combo (should you need it) that fits the 6 on 5-1/2 bolt pattern is the Taskmaster Contender # AC225R6SMQ.
    view full answer...

  • Recommended Hubs and Drums, Electric Brakes, and Tire/Wheel With Timbren 3,500 lb Axle-Less System
  • Replacing existing axles with the Timbren Axle-Less Trailer Suspension System # TASR5200S03 is a great choice since it eliminates a lot of technical information that is needed for traditional axles. As far as wanting to be able to interchange your Jeep Wrangler tires for the ones on your trailer, it is not necessarily recommended. Passenger vehicle tires are made to have a little more give in their sidewall than trailer tires so that they can provide a more comfortable ride. Since the...
    view full answer...

  • Should Tires be Filled to 65 psi Rating on Sidewall Instead of 50 from Dealer
  • If your 225/75R15 tires, like the Contender # AC225R6SMQ, have a 65 psi rating on the sidewall then you definitely need to make sure they are at 65 and not 50 psi. A different psi rating will result in different (typically unknown) load and speed ratings and can result in a blow out due to overheating. Be sure that your tires are cold when testing the psi in them. Cold just means that they have been sitting for a long time (like overnight) and that there isn't any heat build-up. If you...
    view full answer...

Do you have a question about this Tires and Wheel?

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Info for this part was:

Written by:
Mary E
Edited by:
Amanda M

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