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  5. 5 on 4-1/2 Inch
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Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel - 5 on 4-1/2 - Load Range C

Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel - 5 on 4-1/2 - Load Range C

Item # AC13R45SMQ
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Our Price: $124.28
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Shipping Weight: 27 lbs
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Taskmaster 13 Inch Trailer Tires and Wheels - AC13R45SMQ
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Radial tire has 6-ply rating and 1,360-lb max load at 50 psi. 13" x 4-1/2" Steel wheel has 5 on 4-1/2 bolt pattern. Rust-resistant powder coat finish. Beveled stud holes secure wheel. Complimentary roadside assistance included. Lowest Prices for the best trailer tires and wheels from Taskmaster. Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel - 5 on 4-1/2 - Load Range C part number AC13R45SMQ can be ordered online at or call 1-800-940-8924 for expert service.
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Taskmaster Trailer Tires and Wheels - AC13R45SMQ

  • Tire with Wheel
  • 13 Inch
  • 5 on 4-1/2 Inch
  • 175/80-13
  • Load Range C
  • Steel Wheels - Powder Coat
  • Radial Tire
  • M - 81 mph
  • Taskmaster

Radial tire has 6-ply rating and 1,360-lb max load at 50 psi. 13" x 4-1/2" Steel wheel has 5 on 4-1/2 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 resist 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: 13" diameter x 4-1/2" wide
  • Bolt pattern: 5 on 4-1/2"
  • Wheel bolt size: 1/2"-20
  • Wheel capacity: 1,660 lbs
  • Pilot diameter: 3.19"
  • Offset: 0
  • Tire size: ST175/80R13
    • Section width: 6.97"
    • Outer diameter: 24.02"
  • Tire capacity:
    • Load range: C
    • Ply rating: 6
    • Maximum load: 1,360 lbs at 50 psi
  • Tread depth: 7.8/32"
  • Maximum 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"

AC13R45SMQ Taskmaster Contender ST175/80R13 Radial Tire with Silver Modular Rim - 5 on 4-1/2 - LR C

Replaces Taskmaster AC13R45SM

Installation Details AC13R45SMQ Installation instructions

Customer Reviews

Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel - 5 on 4-1/2 - Load Range C - AC13R45SMQ

Average Customer Rating:  4.9 out of 5 stars   (1180 Customer Reviews)

Radial tire has 6-ply rating and 1,360-lb max load at 50 psi. 13" x 4-1/2" Steel wheel has 5 on 4-1/2 bolt pattern. Rust-resistant powder coat finish. Beveled stud holes secure wheel. Complimentary roadside assistance included.


I need a tires for my boat trailer, I ordered from and good replacement tires fit well and it was fast free shipping.


I was excited to get these tires installed and try it out. They were a perfect upgrade for my 5 x 8 Lowes trailer and big improvement. I flipped my axle and now have a lot more clearance, pull smoother etc. great value and quality tire


Tire and wheel look good. Quality is there. Quick delivery


Everything arrived in perfect condition. Very fast shipping and excellent customer service.


Worked perfect for our project, arrived quickly.


They are nice looking tires But I'll have to let you know how they Are When I get it out on the road.


great product, great service


Did a great job getting this product to me as quick as possible. Highly recommend


Delivered as promised.
Customer service
(Mariah A) was great.
Since they are tires it will be some time before I know what there quality actually is.
They look great and I expect them to perform well.

Weve had these a year. Havent gone far but they still look new. Hold air, look good. Expect them to hold up for many years.
Pat - 09/19/2020


Very fast delivery with a fair price. Thank You


Needed a spare for my High Country canoe trailer. This matched perfectly. Price was right and arrived quickly. Thanksa


Thank you so much looks like it'll work just fine have not had the opportunity to bolt it on yet came in today and also the leaf spring looks like it'll fit exactly where the one I broke is LOL thank you so much for your rapid response in filling my order and free shipping did not hurt my feelings at all thank you have a nice day note to Rose thank you also


Got it fast


Wheels look and perform well. Have put a few thousand miles on them with no problems. Would order again.


The service rep was terrific. She analyzed the alternatives and made helpful add-on recommendations without any pushy "up selling."

etrailer comes through once again!


Great price, fast shipping. Quality pr oducts.


The order status updates were excellent. Received the item timely and as ordered. I haven't tried it on the trailer, as this was purchased for a spare, but all measures correctly.


Everything ordered was exactly how described. Very prompt delivery. Will continue to use etrailer for all my towing needs.


Fits nicely on the trailer and easy to attach


Tire and Wheel were a perfect match to my Boat trailer good product.


Very happy ! Exactly what I needed for my Boat trailer. Never had on as they don’t put one on the new ones. Thank you very much


the product was as advertised and service was GREAT getting upgraded to faster shipping was a nice surprise and greatly appreciated THANKS to everyone there!


Still round and still rolling!



All items ordered showed up in very timely manner and fit perfect.

Show More Reviews

Ask the Experts about this Taskmaster Trailer Tires and Wheels

  • Replacement Wheel and Tire Recommendation for 13 inch Wheel On Boat Trailer
    To replace the 13 inch wheel and tire on your trailer the Contender part # AC13R45SMQ would be a great option. This comes with a tire size of 175/80R13 and is on a wheel with a 5 on 4-1/2 inch bolt pattern like it sounds like you have.
    view full answer...
  • Silver Mod Wheel With Tire Size ST175/80/R13 Mounted on it for Trailer
    I believe we have just what you are looking for. Check out the part # AC13R45SMQ. This is a tire size ST175/80R13 mounted on a silver mod wheel with a 5 on 4-1/2 inch bolt pattern. Also, the tire that this comes with has a 81 mph speed rating as well which is nice.
    view full answer...
  • Upgrading from 10 inch Tires to 13 inch Tires on a Boat Trailer
    This is a really common upgrade that happens all the time. The main issue when people do this is fender spacing and since you are planning on removing yours you won't have that problem at all. You are going to want to measure the space between the sidewall of your tire and the trailer and see how much room you have between the two. It is recommended to have a minimum of 1" of clearance between your trailer and tire. The Contender ST175/80R13 Radial Trailer Tire w/ 13" wheel item # AC13R45SMQ...
    view full answer...
  • Replacement Wheels/Tires for a 2005 Fleetwood Resolute Popup Camper
    I have the solution for your wheel and tires on your trailer. For your application, I recommend using a radial tire over the bias ply tire. Radial as designed for the speed and heat generated during highway travel. Radial tires will flex more than a bias tire, giving radials better traction and stability. Radial tires tend to run cooler than bias tires. Heat is then main cause of tire failure on trailer tires. Therefore, the cooler running radial tires will last longer. I recommend the...
    view full answer...
  • How to Determine Tire/Wheel Fitment for a 1983 Sailboat with ST175/80D13 Size Tires
    The main things that you need to check to determine fitment of a new tire/wheel combo on your trailer is the diameter of the tire, the pilot hole, and the bolt pattern. Since these are the same for the Contender w/ 13" Silver Mod Wheel # AC13R45SMQ (aside from the pilot hole being bigger). This wheel fits on 1/2"-20 studs. It is usually good to check the stud size as well which I encourage you to try measuring the studs themselves as all of our 13" wheels are compatible with 1/2" diameter...
    view full answer...
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  • What is Speed Rating of Tire on Contender ST175/80R13 Radial Trailer Tire and Wheel # AC13R45SMQ
    The Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel # AC13R45SMQ has a tire mounted on it that has an 81 mph speed rating.
    view full answer...
  • Will the Tire and Wheel Combos Come Balanced
    The Taskmaster Contender ST175/80R13 Trailer Tire w/ Wheel, # AC13R45SMQ, are not machined balanced. What some manufacturers will do is line up the light spot on the tire with the heavy spot on the wheel. This is a type of balancing but not like how car tires are balanced. You may have the wheel/tire professionally balanced if you wish, but having perfectly balanced tires is not as important with trailer tires as it is with a passenger vehicle.
    view full answer...
  • Is the Contender with Silver Mod Wheel Recommended for Salt Water Applications
    Although the Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel # AC13R45SMQ that you referenced is a great tire and wheel combination, but we do have a better option that will resist salt water more. The Karrier ST175/80R13 Radial Trailer Tire w/ 13" Galvanized Wheel # AM31952 is definitely the better was to go for your application. It utilizes the same tire, but the wheel has a galvanized finish which does a much better job at resisting harsh chemicals like salt than a...
    view full answer...
  • Speed Rating Of Karrier Trailer Wheel and Tire # AM31952
    The speed rating of the trailer wheel and tire part # AM31952 that you referenced is 81 mph.
    view full answer...
  • What Torque Is Required for the Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel
    While using the Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel part # AC13R45SMQ, you'll need to torque the lug nuts like part # CE11051 to around 75-85 ft. lbs.
    view full answer...
  • Can You Increase Tire Size To a 175/80R13 Trailer Tire On a Fleetwood Taos Popup Camper
    To determine if you will be able to change from the 5.30-12 Trailer Tire # AM30859 to a Contender ST175/80R13 Radial Trailer Tire # AC13R45SMQ you will need to measure your tire clearance on your Fleetwood Taos. The 175/80R13 is 2.1" taller and 1.5" wider than your 5.30-12 you currently have. So you will want to ensure you have 1-3/4" of space on your sidewalls and 4.1" of vertical clearance on the tread face. This will ensure that you have enough room for the suspension to flex and the...
    view full answer...
  • Comparing 4.80R12 vs ST175/80R13 for Boat Trailer
    All things being equal it's almost always better to go with a larger trailer tire size when possible. You'll get a smoother ride quality on the trailer and since smaller wheels turn faster at the same speed as larger wheels you end up putting less stress on the hubs and wheels/tires as well. So I'd recommend the part # AC13R45SMQ which will work great. The only thing that might make a slight difference to push you towards the part # AT12R45WM instead would is that since this is a boat...
    view full answer...
  • High Speed Trailer Wheel and Tire Recommendation for Little Giant Tire with ST175/80D13
    The Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel # AC13R45SMQ is a great choice that covers everything you are needing. It has the correct tire size, wheel bolt pattern, and has the highest speed rating of 81 mph.
    view full answer...
  • Do 175/80-13 Size Tires Have the Right Weight Capacity for a 2,500 lb Trailer
    It all depends on the load range of your tires. If you look on the sidewall of your current 175/80-13 tires you should be able to find the load range imprinted/stamped somewhere. Here are the load range capacities for your specific tire size of 175/80-13: B: 1,100 lbs at 35 psi C: 1,360 lbs at 50 psi D: 1,610 lbs at 65 psi Since you add the weight capacity of both tires, as long as they have a load range of C or D, then you have tires that can handle the weight capacity of 2,500 lbs. If...
    view full answer...
  • Replacement Wheel and Tires for my Boat Trailer with the B78-13 Nanco Tires
    The Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel - 5 on 4-1/2 - Load Range C part # AC13R45SMQ matches your need perfectly. It is also available in the load range D you mentioned with the Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel part # AM31994 please keep in mind these are the triangle holes rather than the round.
    view full answer...
  • Recommended Over/Under Kit For A 1992 Coleman Destiny Royale
    When it comes to installing an over/under kit on your 1992 Coleman Destiny Royale The Dexter Trailer Springs Over-Under Conversion Kit # K71-384-00 will work if you have a 2-3/8 inch axle and have double-eye leaf springs only. Using this kit allows you to move the trailer leaf springs to the top of your axle. Depending on how much room you have after you lift it up you should be fine using a 13 inch tire depending on what bolt pattern you have for example The Contender ST175/80R13 Radial...
    view full answer...
  • Trailer Tire and Wheel Replacement for Utility Trailer with P155/80-13 Tire Size
    The closest ST rated trailer tire to the vehicle tire size you have now is the ST175/80-13 like the # C17513C or for a setup that has a wheel and tire since you mentioned your bolt pattern we have the # AC13R45SMQ which comes with a silver mod style wheel. Passenger vehicle tires like what you have should not be used on trailers as they weren't designed for the vertical loads that trailers often see.
    view full answer...
  • Best Trailer Tire in Size 175/80-13 for 2014 Tracker Bass Buggy 18 ft.
    The Contender trailer tire part # C17513C is the best option for the tire size of 175/80-13 replacement you are looking for. These are a radial construction which is the most preferred, has a great speed rating of 81 mph, and has a higher capacity of 1,360 lbs at 50 psi. For this tire on a silver wheel we have the part # AC13R45SMQ.
    view full answer...
  • Larger Tires to Replace 5.30-12 of Trailer
    The next larger tire size in overall diameter than your 5.30-12 is the tire size 175/80-13 like the # AC13R45SMQ which is on a 5 lug wheel or the part # AM3S030 which is a 4 lug. This will give you about 3 inches of additional height.
    view full answer...
  • How To Determine If You Can Switch From 4.80" X 12" To 175/80R13 Trailer Tires On a Single Axle
    To determine if you will be able to switch from your Taskmaster 4.80R12 Radial Trailer Tire # TT48012C to a Contender ST175/80R13 Radial Trailer Tire w/ 13" Silver Mod Wheel # AC13R45SMQ on your trailer you will need to measure your current tire clearance. The ST175/80R13 is 3.4" taller and 2.13" wider than your current tire. This means you will want to have at least 2-1/8" clearance on the sidewalls of your current tire and 4.7" of vertical clearance for the larger tire to fit without...
    view full answer...
  • Axle, Hubs, Tire and Wheel Recommendation for Homemade 2,000 lb Trailer
    While I totally understand the convenience of having a spare that can be used on either your trailer and your van, I cannot recommend using automotive tires on a trailer (or vice versa), and here's why. ST (Special Trailer) tires are made for a specific purpose—supporting the vertical load and cornering forces of trailers, which is why their sidewalls are stiffer. P (Passenger) tires are designed with more flexible sidewalls and are made with passenger comfort and steering in mind and...
    view full answer...

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Mary E
Written by:
Mary E
Employee Wilson B
Updated by:
Wilson B
Employee Matthew E
Updated by:
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Edited by:
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