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Loadstar ST185/80D13 Bias Trailer Tire with 13" White Wheel - 5 on 4-1/2 - Load Range D

Loadstar ST185/80D13 Bias Trailer Tire with 13" White Wheel - 5 on 4-1/2 - Load Range D

Item # AM3S331
Our Price: $134.88
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Trailer Tires and Wheels
Shipping Weight: 32 lbs
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Kenda 185/80-13 Trailer Tires and Wheels - AM3S331
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Bias tire has a ply rating of 8 and a 1,725-lb maximum load at 65 psi. The 13" diameter x 4-1/2" wide steel trailer wheel features a 5 on 4-1/2 bolt pattern and a corrosion-resistant powder coat finish. Great Prices for the best trailer tires and wheels from Kenda. Loadstar ST185/80D13 Bias Trailer Tire with 13" White Wheel - 5 on 4-1/2 - Load Range D part number AM3S331 can be ordered online at or call 1-800-940-8924 for expert service.
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Kenda Trailer Tires and Wheels - AM3S331

  • Tire with Wheel
  • 13 Inch
  • 5 on 4-1/2 Inch
  • 185/80-13
  • Load Range D
  • Steel Wheels - Powder Coat
  • Bias Ply Tire
  • M - 81 mph
  • Kenda

Bias tire has a ply rating of 8 and a 1,725-lb maximum load at 65 psi. The 13" diameter x 4-1/2" wide steel trailer wheel features a 5 on 4-1/2 bolt pattern and a corrosion-resistant powder coat finish.


  • Loadstar special trailer tire outshines other bias tires
    • Flatter tread offers improved stability for excellent handling
    • 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
    • Advanced rubber compound
      • Longer tread wear
      • Low rolling resistance for smooth ride
  • Steel wheel by Dexstar has 8-spoke design
    • Resists rust with e-coat and white powder coat finishes
  • Tire-and-wheel assembly meets Department of Transportation specifications


  • Rim dimensions: 13" diameter x 4-1/2" wide
  • Bolt pattern: 5 on 4-1/2"
  • Wheel capacity: 1,660 lbs
  • Wheel bolt size: 1/2"-20
  • Offset: 0
  • Pilot diameter: 3.19"
  • Tire size: ST185/80D13
    • Section width: 7.2"
    • Outer diameter: 24.4"
  • Tire capacity:
    • Load range: D
    • Ply rating: 8
    • Maximum load: 1,710 lbs at 65 psi
  • Maximum speed: 81 mph (speed rating M)
  • Warranty:
    • 5-Year on tire
    • Limited 1-year on wheel

1-Year Worry-Free Guarantee

This tire has a 1-year worry-free guarantee. If within the first 12 months the tire is damaged in any way, it will be replaced at no charge.

Bias Tires vs. Radial Tires

Bias vs. radial tire graphic

Bias ply tires are designed for off-road or agricultural applications. They are built with thick, durable nylon cords that are positioned at a 30- to 45-degree angle to the direction of travel. The layers alternate in a crisscross pattern, making the sidewalls stiffer so that the entire tire is able to flex easily. As a result, the tire provides a smooth ride and improved handling when trailering on uneven surfaces.

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"

3S331 Dexstar 8-Spoke 13" White Wheel and Loadstar K550 Bias Tire - LR D

Replaces Americana 3S331DX

Customer Satisfaction Score:

Customer Reviews

Loadstar ST185/80D13 Bias Trailer Tire with 13" White Wheel - 5 on 4-1/2 - Load Range D - AM3S331

Average Customer Rating:  4.9 out of 5 stars   (9695 Customer Reviews)

Bias tire has a ply rating of 8 and a 1,725-lb maximum load at 65 psi. The 13" diameter x 4-1/2" wide steel trailer wheel features a 5 on 4-1/2 bolt pattern and a corrosion-resistant powder coat finish.


Finally had an opportunity to use the trailer with the new tires. They performed flawlessly which one would expect after buying new tires. I actually bought a higher rated tire then I needed just for my own reasons, Haven't noticed any ride difference as far as a harder or stiffer ride. Put over 500 miles on 'em the first time out. Very happy with these.

Rick S.


As a follow up tires are still performing great. No issues. We tow a 2900 pound pop up all over the place, Normal run for us would be about 300 miles give or take. Tires and rims have been awesome.


For the price of these new wheels and tires it’s hard to justify pulling a camper to a tire shop and leaving it to get new tires; I ordered a set of four from etrailer and they came in a few days later; I got new tires “and wheels” and didn’t have to take my camper somewhere to get it done; also by doing this I was able to save my best looking tire for a spare and take the three used wheels and tires to scrap for cash! I also saved another used one to use as a spare for my utility trailer.


I have less than 100 miles on these tires so I really can't say it is a 5-star item. It sure looks the part in person. I haven't had any indication that they are out of round or have sidewall issues. Although I have few miles on these tires, I made the same purchase for the next project's needs. I will also be purchasing another two for spares.


Bought as a spare tire for my boat trailer. Lug pattern and tire size are exact match. Cheaper from these guys.


Thank you, etrailer for stocking this size wheel and tire. I've looked everywhere and couldn't find it. It's a great quality wheel and great tire. It looks good on my pop up. Also need to thank etrailer for a great experience. When my tire arrived, it had been mislabeled at the warehouse and was a different side than what I ordered. I called etrailer and they exchanged it hassle free. I will definitely use etrailer again when I need camper parts. Oh, and the price was great!


My pop up trailer needed new tires, and I couldn’t find any locally (not at the camper store, not at Walmart, not at Tires Plus). I easily found what I was looking for on this website and ordered two tires. They came quickly. Unfortunately, I bought the wrong ones (read the manual wrong). Return was easy and I got my new tires quickly. Yay! I would definitely do this again—super easy.


I want to thank you for excellent service -- I could not ask for better. Your web site was easy to use and to order from. I received a quick confirmation of the order, which even seemed personalized confirmation of shipping. And then it arrived 3-4 days earlier than I would have expected. And it was the right product, right size, right mount. And it was all done in about 15 minutes for me- saved me driving time, gas costs, and having to special order unstocked merchandise locally-- less expensive when all those factored in. I'm delighted.


An easy, competitive priced order. Will shop eTrailer again. Thanks.


The tires and rims have been great for over 3000 miles hauling my 4000 lb tractor from N Illinois to Gulf Shores, Alabama and back! I did have them balanced before installing!


Ordered Westlake Pop-up camper tires with rims. Arrived exactly on time! Easy ordering, detailed description and wheels & rims look great on our pop-up. Thanks etrailer!


Tires and wheels are excellent replacements on my tent trailer. Even came inflated to the proper tire pressure right out of the box. Would purchase again with no problems.


Fast and easy. Great product


Everything went smooth and quick delivery.



Ordered online and it arrived in less than a week. Tires for our pop up camper are increasingly hard to find locally. E-Trailer comes through again. Thanks.


I replaced my tires and wheels using a full set of four of these. It cleans up the look of my aged trailer and i feel safer. I could not be happier. Thanks to for the quick shipment.


Order was sent out very fast. Product is excellent. Installation easy. Very happy


I haven’t installed the wheel yet but it appears to be very good quality. Ordering was easy and the information needed to order the correct wheel/tire was provided on your web site. So far I’m very satisfied.


The tires arrived today and I could not be happier !!!! From order to delivery the service was great. I was a but concerned because I have never ordered tire over the web and thought they might be scuffed or scratched when they arrived. I was wrong they are in perfect condition and look great on the camper.


I'm happy to purchase the Rims. and Tires for the trailer boat


13" trailer tires. I needed to lower my trailer bed, but was worried about a smaller tire not having enough load capacity. I found these, load range D, with nearly the same capacity as my 15" tires. Good price, quick delivery.



They have worked very well. I may go back to a larger tire and wheel. I’m sure you have deals.


The greatest part about this purchase? For the size and weight of this rim and tire, not only was it free shipping but it arrived in 3 days. It would have received 5 stars but I haven’t used it yet as it’s a spare for my trailer.


This is the 3rd item I've ordered from e trailer.good company.


This is a great tire for my heavy duty application of a Coleman Bayside tent trailer. Etrailer delivered for me over night when I had to use my spare and I still had quite a distance to travel. Since it was late in the day the customer Service Rep Erika made sure the order went to the warehouse and it made it out for overnight delivery.



You got me out of a big problem with that tire, and for that I thank you immensely. There are not a lot of sources for that wheel and tire, and the Coleman Bayside was so heavy it needed this tire. We have since sold that trailer, so I cannot comment, but I am sure it is doing fine. Thanks again


The specific tire I needed was hard to find. was the only place I could find it. It took a little longer to get because of manufacturer delays, but the customer service team at contacted me and offered alternatives that would work for my tailer and could have been shipped earlier if I wanted to go with an alternative. I chose to wait for the specific tires I ordered, and they kept in touch with me with updates on my order until it shipped. When they notified me they shipped it, I received the tires within a few days. The tires arrived in great condition, and it's exactly what I needed. The customer service was excellent, and I will definitely purchase from again.


The service from is topnotch. Everything arrived at my front door BEFORE I was expecting it. The product was as described online. I had the tires and wheels balanced before I mounted them on my pop-up. I've only put about 1900 miles on them, but have noticed no problems whatsoever. I would not hesitate to recommend

Show More Reviews

See what our Experts say about this Kenda Trailer Tires and Wheels

  • How to Measure a Trailer Axle to Find a Replacement
    If the rear axle on your trailer is a round axle then we may have one that will fit. Do you know the capacity you need? To measure a round axle measure from hub face to hub face (the surface the wheel attaches to) and from the center of one spring hanger to the other. I have included a picture that shows this for you. I have included a link to the axles that we carry. If none match what you need or you have a torsion axle or square axle then you can special order an axle that fits your...
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  • Will a 175/80-13 Trailer Tire Fit the Same Wheel as a 185/80-13 Trailer Tire
    Trailer tires in sizes 175/80-13 and 185/80-13 will fit the exact same wheel sizes. You can have the 175 mounted on the wheel and use it as a spare but you would not want to run different sizes for long. I have included a link to some trailer tire FAQ articles for you. One of them shows the 2 different sizes you have and that each will fit the same size wheels.
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  • Will ST175/80-13 and ST185/80-13 Trailer Tires Fit on the Same Size Wheel
    Yes, both an ST175/80-13 and ST185/80-13 will fit on wheels that are 4-1/2, 5. or 5-1/2 inches wide. The main difference in these 2 sizes is the overall width of the mounted tire and the overall diameter. 175/80-13 will be 6.895 inches wide and have a diameter of 24.1 inches. 185/80-13 will be 7.289 inches wide and have a diameter of 24.4 inches. I have included a couple of tire FAQ article links for you.
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  • Replacing P195/70B13 Tires on a Boat Trailer
    Any tire size that starts with the letter P indicates that the tire should only be used on a passenger vehicle. You will want to use a size that starts with ST which stands for specialty trailer. If you can determine what bolt pattern your current rims are we can definitely help pick out new rims/tires for your boat trailer. I attached a help article that details how to do this. If your bolt pattern is 5 on 4-1/2 inches the part # AM3S331 size ST185/80D13 that you referenced would fit...
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  • Do Loadstar 185/80D13 Sized Trailer Tires Need to be Balanced
    Trailer tires do not need to be balanced like passenger tires on a vehicle do. Our tire and wheel combos are balanced by mounting the high heavy spot on the tire so that it is aligned with the low light spot on the wheel. They can be balanced at a tire shop if you'd like but it isn't necessary. The tire and wheel combo you referenced, Loadstar # AM3S331 is a 185/80D13 bias tire that has a Load Range D. It's rated up to 1,725 pounds at 65 psi. Trailer tires should always be inflated...
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  • Why Not To Use 2 Different Sized Trailer Tires
    The issue stems from the 175/80R13 tire being 0.7" smaller than the 185/80R13 tire like the one found on the Loadstar # AM3S331,. Running a smaller tire on one side of the trailer causes issues with uneven wear of your tires and handling issues with the trailer. It might be alright to do in the event of an emergency where your spare tire is a slightly different size than your regular tire, but this should only be done in order to limp the trailer to a tire shop to get the properly sized...
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  • Do Bias Ply Tires Have a Larger Diameter that Radial Tires in the Same Tire Size
    Bias ply tires can have a larger diameter than a radial tire of the same size. This is due to the way they are constructed. The cords in a bias ply tire run at a 32 degree angle to the direction of travel. This gives the tires a stiffer sidewall. The cords in a radial tire run at a 90 degree angle from the direction of travel allowing for more flex and better traction. The diameter difference is usually very minimal and unfortunately there is no set rule or dimension for the diameter differences....
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  • Backspacing of Loadstar ST185/80D13 Bias Trailer Tire # AM3S331
    The backspacing of the wheel and tire combo part # AM3S331 that you referenced is 2-3/4 inches.
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  • How Many Years Do Trailer Tires Last
    As a general rule of thumb, trailer tires should be replaced every 6 to 8 years regardless of wear. Even though an older tire might appear to have plenty of tread left on it, dry rot and cracking can cause tire failure. A trailer tire that is 10 years old is way too old to be used. I attached a link to a help article that has more trailer tire info as well.
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  • Do Trailer Tires and Rims Like Kenda # AM3S331 Come Already Balanced
    The tire and rim combos we carry arrive balanced in a certain way but not like a tire shop would balance a tire. Each tire and each wheel has a heavy spot and a light spot. What the manufacturers do is to offset the heavy spot on one with the light spot on the other to achieve some balance. Balancing beyond this is not necessary since trailers do not have steering or drive axles.
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  • Trailer Hubs to Accommodate Tubeless Tires on a Trailer with 8 x 14.5 Donut Rims
    In order to recommend replacement hub and drum assemblies for your trailer, we will need to know the trailer axle weight ratings for each axle, the bolt pattern on the new wheels you intend to use, the type of braking system used on your trailer (electric, electric-over-hydraulic or hydraulic) and the inner/outer bearing numbers. The bearing numbers will enable us to identify a hub that is compatible with your spindle. We recommend replacing all components on an axle at the same time,...
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  • Are Trailer Wheels Made with 5 Lug Bolt Patterns
    We do have 5 lug rims like the # AM3S331 that you referenced. This wheel and tire has a bolt pattern of 5 on 4-1/2 inches. We have a few different 5 lug bolt patterns though so you may want to check out the help article I attached that covers how to determine what bolt pattern you have first.
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  • How to Prevent Uneven Trailer Tire Wear
    You don't say where the tires are wearing out, but excessive inner wear on both tires typically means you have a bent axle, worn or broken suspension components or the trailer is being overloaded. When your trailer is overloaded for an extended period of time the axle could be bent which means it is not holding your load appropriately resulting in the excessive wear on the inside of your tires. A trailer axle should be slightly arched, with the high spot in the center of the trailer and...
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  • Are Boat Trailer Radial Tires the Same as Truck Radial tires?
    To answer your question, no; trailer tires and car/truck tires are not going to be the same and it's not recommended that you use truck tires on a boat trailer. There are times where LT (light truck) tires are used in RV applications, but generally speaking, trailer tires with the ST (special trailer) designation are designed with thicker side walls to help support the heavier vertical loads that occur when towing/hauling. A wheel/tire combo like the Loadstar ST185/80D13 Bias Trailer Tire...
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  • How to Pick out a Trailer Spare Tire for a 2014 Tracker Pro Guide V-175 Combo
    In order to determine what replacement wheel and tire you should get as a spare for your 2014 Tracker Pro Guide you will need to first determine what size tire you have. On the side of the tire there will be a size that looks like ST185/80D13. With that information you will know the tire size and the rim diameter. Next you need to know what bolt pattern you have on your trailer. Check out the FAQ article I attached on determining bolt patterns. If you can email me back with the size listed...
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  • Diagnosing Possible Causes of Uneven Trailer Tire Wear
    Typically, when a tire displays excessive wear on the inside of the tread (closest to the trailer), it means that the trailer is consistently being overloaded. When the trailer carries more weight than the axle is rated for, the trailer axle can bow as shown in the diagram I provided, placing the inner edges of the tread in contact with the pavement. Broken or excessively worn suspension components can cause this as well. Examine the components like the leaf springs and shackle links and...
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  • Replacement Wheel/Tire Combo for 2014 Tracker Pro 170 Trailer
    The Kenda wheel/tire combo you referenced, part # AM3S331 uses the correct tire size, but you'll need to make sure the bolt pattern on the replacement wheel matches your hubs. Measure the distance between two adjacent lug holes in your existing wheels. If this distance is 2-5/8, the bolt pattern is 5 on 4-1/2, in which case the # AM3S331 would work great for you. If you have a different bolt pattern, let me know and I'd be happy to make a suggestion for you. I'll link you to our FAQ article...
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  • Trailer Tire is Wearing on the Inside Tread, Will a Larger Tire Size Help
    A tire that is wearing more on the inside of the tread usually means that the trailer is either overloaded or the tire is toed out at the bottom which could be the result of something being bent, like the spindle, or out of alignment. Going to a higher capacity tire could help some but it doesn't solve the problem that is causing the uneven wear. I recommend taking the trailer to a shop that works on trailers to have it checkout out. Worn suspension components could be the culprit and...
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  • Can a 14x6 Trailer Rim be Replaced by a 14x5 Rim
    Going to a skinnier trailer rim like what you are looking to do shouldn't be a problem. A rim that is 1 inch thinner should work just fine. All of the 14 inch trailer tire size we offer are confirmed to fit 14 by 6 inch and 14 by 5 inch rims so you should be able to still use your current tire size.
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  • Will 175/80-14 Tires Replace 175/80-13 Trailer Tires
    The only difference between a 175/80-13 and a 175/80-14 is the height. The 14 inch model will be 1 inch taller. You need to make sure there is 1/2 inch of space available above the existing tires size to accommodate the larger size. I have included a couple of links on trailer tires for you. Also, a 14 inch tire will not fit a 13 inch wheel so you would need to replace the wheels as well. A 175/80-14 is not a common trailer tire size. If you meant a different size, let me know.
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  • Can 175/80-13 Sized Trailer Tires be Replaced with 185/80-13 Sized Tires
    The issue you can run into when you increase tire size on your trailer is clearance. You want to have about 4 inches in between the tire tread and underside of the wheel well and at least an inch or so between the tire's sidewall and any parts of the trailer. As long as you have the clearance you'll be fine. Your current tire size of 175/80-13 has an outer diameter of about 24 inches and is about 7 inches wide. The 185/80-13 size tires, like # AM3S331, are about 24-1/2 inches in diameter...
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  • Can a Light Truck Be Used in Place of an 8-14.5 Trailer Tire
    An 8-14.5 tire is normally seen on a motor home axle, which is designed for one time use only. We do have one tire that will fit, # AM10321. Some trailers can use a light truck tire but you do not want to use a passenger vehicle tire. The problem is that passenger vehicle tires are not rated and constructed to handle vertical load like a trailer tire is. Trailer tires have a thicker side wall. I have included a link to our FAQ on trailer tires for you to view.
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  • Recommended Tire Pressure for Trailer Tire Even Though Trailer Will Not Have Max Load
    On any trailer tire such as the Kenda # AM3S331 you always want to inflate the tire to the maximum psi, which on this tire is 65. Doing this will give you the best performance, allowing the tire to wear more slowly and give you optimum gas mileage.
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  • How to Pick Out Spare Wheel and Tire for a Boat Trailer
    You will need to know two things to pick out a spare wheel and tire for your boat trailer. You will need to know the size of the tire that is on the trailer currently and the bolt pattern of the wheel. The tire size will be listed on the sidewall of the tire. I attached a picture that shows what it will look like. I also attached a help article on determining wheel bolt patterns as well. Once you know that information check out the other link I attached that has all of the wheels and...
    view full answer...
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