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  1. Trailer Axles
  2. Timbren
  3. 3500 lbs
  4. Universal Fit
  5. 5 on 4-1/2 Inch
  6. No Drop or Lift
Timbren Axle-Less Trailer Suspension w Idler Hubs - Standard Duty - No Drop - 5 on 4-1/2 - 3,500 lbs

Timbren Axle-Less Trailer Suspension w Idler Hubs - Standard Duty - No Drop - 5 on 4-1/2 - 3,500 lbs

Item # A35RS545
Our Price: $1,477.93
Trailer Axles
Shipping Weight: 65 lbs
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Get more clearance and a smoother ride. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, standard-height spindle keeps your deck height the same. Fits any trailer frame width. Includes inner (L68149) and outer (L44649) bearings. Great Prices for the best trailer axles from Timbren. Timbren Axle-Less Trailer Suspension w Idler Hubs - Standard Duty - No Drop - 5 on 4-1/2 - 3,500 lbs part number A35RS545 can be ordered online at or call 1-800-940-8924 for expert service.
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Timbren Trailer Axles - A35RS545

  • 3500 lbs
  • Universal Fit
  • 5 on 4-1/2 Inch
  • No Drop or Lift
  • Rubber Spring Suspension
  • Idler Hubs
  • Timbren
  • Easy Lube Spindles

Get more clearance and a smoother ride. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, standard-height spindle keeps your deck height the same. Fits any trailer frame width. Includes inner (L68149) and outer (L44649) bearings.


  • Delivers a smooth, stable, quiet ride - regardless of load size
    • Jounce springs absorb road shock and support trailer's load
    • Rebound springs minimize body roll, rattle, and bottoming out
    • Built-in camber and toe-in reduce wear on your trailer's tires
    • Units work independently - what affects one side of your trailer won't affect the other
  • Eliminates axle beam to increase ground clearance and fit any trailer frame width
    • System replaces 1 trailer axle and suspension components
    • 2 Separate units bolt directly to your trailer's frame
  • Designed for your on-road adventures
    • Strong steel construction is built to last
    • Black powder coat resists rust and corrosion
  • Keeps trailer deck height the same while increasing ground clearance
    • Standard-height spindle is built in
  • Includes idler hubs with bearings, races, and seals
  • Allows for simple bearing maintenance with built-in grease zerks


  • Application: single- and tandem-axle trailers that use regular tires
    • Tandem-axle trailers require 2 complete systems
    • Not recommended for triple-axle trailers
  • Quantity: 2 suspension units (with hubs)
  • Weight capacity: 3,500 lbs
  • Bolt pattern: 5 on 4-1/2"
  • Bolt hole diameter: 1/2"
  • Suspension travel: 1-3/4"
  • 3-Year limited warranty

Tire, Wheel, and Hub Compatibility

  • Tire size: 235/85R16 or smaller
  • Wheel diameter: 16" or smaller
  • Bearings (included)
    • Inner: L68149
    • Outer: L44649
  • Races (included)
    • Inner: L68111
    • Outer: L44610
  • Seal: 10-19 (included)
    • Inner diameter: 1.719"
    • Outer diameter: 2.565"

Note: This Axle-Less system requires crossbeam support. If your trailer frame doesn't have a crossmember in place, you can retrofit it with one, or you can add a support by running a piece of 2" x 2" steel tubing through the square holes cut into these units. You could also add a steel reinforcement bracket to the inside of the trailer frame.

Get more ground clearance and a more comfortable ride when you're towing with Timbren's Axle-Less trailer suspension. This suspension system provides great shock absorption to comfortably get you where you need to go and to protect your precious cargo as you travel - even on rough pavement. With 2 independently operating units, you'll get better handling when making tight turns. And because this system eliminates your axle and has standard-height spindles built in, you'll get more clearance without having to raise your deck height.

Timbren Axle-Less Suspension vs. Other Suspension Systems

There are many suspension options for your trailer or camper. So, what makes Timbren Axle-Less different?

Leaf Spring Example

Axle-Less systems are a definitive upgrade over traditional leaf springs, in part because they allow you to do away with your thru-axle, allowing for maximum clearance. As you've probably noticed, having a leaf spring suspension means that your axle will always hang at least a few inches below your trailer's frame, resulting in limited ground clearance. This may make it difficult to navigate rough roads.

In addition, while leaf springs do a great job of supporting an even load, they may cause your trailer to bounce and rattle when it's empty or to bottom out with a heavy load. And they don't offer any type of shock absorption for a smooth ride - unless you have upgrades built in. With Timbren's Axle-Less system, gone are the days of dealing with these annoyances - this suspension is designed for a quiet, balanced ride, whether your trailer's fully loaded or empty.

Torsion Axle Example

A torsion axle is a step up in terms of shock absorption, and it provides more clearance than a traditional, leaf spring suspension, but that crossbeam will still hang down some. And if your torsion axle gets damaged in any way, it can't be repaired - you'll have to replace the entire thing with a setup that matches your exact trailer frame width.

With the Axle-Less system from Timbren, you won't have a low-hanging axle beam to get in the way when you're driving on rough roads. The standard-height spindles on this setup will keep your deck height the same, so you'll get that extra clearance and still be able to easily load and unload your trailer. And the rubber springs and independent operation both combine to absorb shock and deliver a smooth, easy ride. In addition, the Axle-Less system can be easily maintained over time, and it will fit any trailer frame width, so you don't have to worry about potentially ordering the wrong size like you might with other systems.

Timbren Silent Ride Example

Another suspension upgrade on the market is Timbren's Silent Ride. This setup is a great option to reduce bounce and rattle because it has the same AEON rubber springs as the Axle-Less system. But the Silent Ride still requires an axle, so you won't get the same ground clearance or low deck height as you will with the Axle-Less suspension.

Timbren Axle-Less Suspension Parts

The Timbren Axle-Less suspension is designed with you in mind. All of the parts work together so you can tow your trailer comfortably - regardless of load size.

Timbren Axle-Less Suspension Parts Diagram

  1. The jounce spring supports the weight of your trailer and cargo. It easily absorbs road shock and is constructed of AEON heavy-duty, hollow rubber.
  2. The rebound spring delivers a smooth, stable ride - regardless of how much cargo is on the trailer. It controls the movement of the jounce spring to minimize trailer body roll, bounce, rattle, and bottoming out.
  3. The trailing arm with integrated hanger attaches the suspension to the side and bottom of the trailer frame.
  4. The control arm carries the spindle and the hub. It pivots on strong, long-lasting polyurethane bushings that never require lubrication.
  5. The E-Z Lube spindle is simple to grease. If damaged, it can be removed and replaced, saving you both time and money compared to a traditional axle.
  6. The built-in hole accepts 2" x 2" steel tubing (not included) to add support to your trailer's frame. The tubing sits higher than a trailer axle, providing additional ground clearance.

Installing the Timbren Axle-Less Suspension

Measuring Diagram

The first step in installing the Timbren Axle-Less suspension is to make sure that the mounting points for each unit are directly across from each other. The easiest way to measure this is to mark the desired mounting points on your trailer's frame. Then measure the distance between these points and the center of your trailer coupler. These measurements (A and B) need to be within 1/8" to keep your trailer frame square.

Once you have your mounting points lined up, you'll be ready to install the system. Drill 3 holes into your trailer frame at the desired mounting points. Then bolt each unit to the frame with Grade 8, 1/2" bolts (not included).

Keep Your Trailer Frame Square

Because Timbren's Axle-Less system eliminates your trailer's thru-axle, you'll have to find another way to get the crossbeam support that keeps your trailer frame square. You have a few different options to do this depending on your application and how much fabricating you're comfortable doing.

Crossmember Installation

If you're building a trailer, the best option is to begin building with the Timbren Axle-Less in mind and include a crossmember where you want to install the units on your frame. You can also retrofit an existing trailer with a crossmember.

Steel Tubing Installation

If you don't have a crossmember where you want to install the Axle-Less system (and you don't want to add one), pick up a section of 2" x 2" steel tubing from a nearby weld shop. This tubing will serve as a support to keep your trailer square. It will hang only about an inch down from your trailer frame, providing more clearance than a thru-axle.

After you've mounted both of the units to your frame, you'll need to drill 3 holes into the steel tubing and into the built-in, square holes. Then, insert the tubing through the holes and secure it with 3 bolts (not included) on each side.

Reinforcement Bracket Installation

The last option is to fabricate a reinforcement bracket that can be attached to the inside of your trailer frame and to the Axle-Less suspension. It may be a little harder to fabricate a compatible bracket than to mount steel tubing, but you may get additional clearance with this method.

Dimensions of the Timbren Axle-Less Suspension

The following diagrams show measurements taken on the Timbren Axle-Less suspension system without hubs.

Axle-Less dimensions front view

13" 15" 1" 5" 3-13/16" 4-1/4"

Axle-Less dimensions top view

5-5/8" 6" 4-3/4" 1-3/4" 3-3/8" 3-11/16"

ASR3500S05 Axleless Trailer Suspension System by Timbren - Standard Height Spindle - 5 on 4-1/2" Hubs - 3,500 lbs

84545_2 Trailer Idler Hub Assemblies for 3,500-lb Axles - 1/2" Studs - Quantity 2

Customer Reviews

Timbren Axle-Less Trailer Suspension w Idler Hubs - Standard Duty - No Drop - 5 on 4-1/2 - 3,500 lbs - A35RS545

Average Customer Rating:  4.6 out of 5 stars   (293 Customer Reviews)

Get more clearance and a smoother ride. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, standard-height spindle keeps your deck height the same. Fits any trailer frame width. Includes inner (L68149) and outer (L44649) bearings.


I rebuilt a 4 x 8 trailer using the Timbren Axle-Less Trailer Leaf Spring Suspension and it works great. I would recommend it to others.

David J.


Working out just fine.


Had a broken torsion axle on dual axle boat trailer. Manufacter six to eight weeks to replace. Got this product in week. Installed same day. Very happy .cancelled new Axel order.


Item is just as ordered and was shipped quickly. My original order was lost in transit but etrailer worked with UPS to finish the claim and get me a replacement part for what went missing. Customer support was awesome and extremely helpful! Will definitely buy from them again!


Still working on it but so far I am very please with my purchase


I was amazed at the attention given to me and my order. I was kept up to date untill my order arrived, it also arrived a few days before the expected time. The axle less system looks to be so much easier to install and more functional than the regular spring suspension. If compared by cost and labor to the other spring system, I find that this is considerably less. I have yet to install it, but will send photo of finished product as soon as possible.


Awesome suspension! I’ve been towing my al. trailer with our atvs & dirt bikes and it’s always been a smooth ride. Love it!


Great product,super quiet while trailing on the road. Great for replacing dual axles and gives better options when you have a tire flat or hub issue. All of these are independent of each other.


They did a great job communicating. I was evem offered an alternative item that was in stock, but ultimately I decided to wait for the backordered parts since they were heavier duty.


Fast delivery, exactly what I needed to repair my boat trailer.
Good quality, easy installation...


have not opened the boxes yet


Just what I wanted. This is a great productions Etrailer did a great job thank you. We will be doing more business soon.


Ashley was extremely helpful and quick to respond to my questions both via phone and email. Excellent customer service and quick turn around on my order.




I have not installed them yet but looking at them they look like they are going to be easier than I expected.


Great system


Customer service was excellent and the products were well priced




The axle-less suspension worked very well for my boat trailer. The suspension was easy to attach to the trailer frame and provided a lower profile than the traditional leaf spring and axle system.


The service from etrailer has been great! They have been very helpful through the entire purchasing process. My one star is due to the quality of the product. First, for something as heavy duty as these are, you’d expect better packaging. On arrival, one of the spindles was sticking out of the box and the hand holds were torn on one of the other boxes. I was a little worried what I might find in the damaged box but everything seems to be intact. The disappointing part is the quality of the welds. For the price you are spending on these, I would expect a higher quality of fabrication. There is undercut in the welds that hold the three support plates together and big ol sloppy welds every where else. Unsure of what to do as my trailer has been designed around this suspension system.


Very smooth pull. I'm very impressed on how the trailer pulls. My traditional axle trailer seemed to bounce a lot on the highway which made a lot of noise, but with the Timbren Axle-less that I installed on a new trailer, the trailer is so smooth and way less noise.
Great product.


Installed the Timbren Axle-less suspension a little over a year ago and approximately 5000 miles ago. I have been extremely satisfied with the installation and performance thus far and have had no issues. I also chose to install an optional crossmember for more strength using a 1/4" thick piece of 2x3 steel. I had to increase the weight capacity of my campers suspension due to renovating the interior completely and adding more weight. I also strengthened the frame to accommodate the extra weight. In addition to installing the Timbren 5200LB system I installed new 12" electric brakes and upgraded to 225/75R15 tires with E load range rating.


Installed the Timbren Axle-less suspension a little over a year ago and approximately 5000 miles ago. I have been extremely satisfied with the installation and performance thus far and have had no issues. I also chose to install an optional crossmember for more strength using a 1/4" thick piece of 2x3 steel. I had to increase the weight capacity of my campers suspension due to renovating the interior completely and adding more weight. I also strengthened the frame to accommodate the extra weight. In addition to installing the Timbren 5200LB system I installed new 12" electric brakes and upgraded to 225/75R15 tires with E load range rating.


The trailer rides great down the road and no more worries about saltwater and rusty leaf springs. Not a cheap option but I’m very happy with the setup. When installing, just be sure to measure accurately and have sharp drill bits. A drill press type of guide also helps ensure correct drilling angles. The first picture is of a mounting gusset a local welding shop made. One is needed for each side and necessary to provide needed mounting strength-at least on my trailer frame. Pics 2 and 3 show the mounted suspension on one side of the trailer. Pic 4 shows the suspension on one side of the trailer with the axle attached and a separately purchased disc brake assembly mounted on it. Finally, pic 5 shows a 2” box channel between both suspension assemblies. Independent suspensions would have been nice, but I wanted to ensure trailer rigidity was maintained. So, after one year, so far, so good. It’s all smooth sailing down the highway.


Incredible system. Handled our Overland trek through Colorado and Moab. These axles on our 1917 Ford bed ran multiple Jeep Badge of Honor trails. The suspension handled flawlessly. Handles off camber rocks and drop offs smoothly. We ran the 4 inch lift and off road offset to fit the factory Jeep wheels.

Show More Reviews

See what our Experts say about this Timbren Trailer Axles

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    According to your axle tag it looks like you have a 3,500 lb axle that is overall length 94.5 inches with spring centers 70 inches. Since we don't have any standard axles that match those dimensions best option we have would be Timbren axle less kit like the part # A35RS545E for if you need brakes or # A35RS545 for idler hubs. If you wanted a traditional straight axle you'd have to find a local trailer shop to you who can order in custom axles based on dimensions.
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  • Recommended Timbren Axle-Less Trailer Suspension System to Replace 3500 lb Axle
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  • Recommended Axle-Less Suspension For Trailer With 3,500 Lb Wide Axle
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  • Timbren Axle-Less Trailer Suspension for 3 Ton Application
    It sounds like you would like to add 2 sets of the Timbren Axle-Less system that can handle 3 tons. Since the # A20RS545 only has a 2,000 lb capacity, a pair of these would not be able to handle 6,000 lbs. Instead, you would need the Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 # A35RS545. These have a 3,500 lb capacity, so 2 of them will be able to handle your 6,000 lb unit. These also have the same 5 on 4-1/2 bolt pattern as the 2,000 lb system....
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  • Should Tandem Axle Trailer Use 2 Timbren Axle-Less System or 1 Higher Capacity Axle-Less System
    If the trailer was designed to run on two axles I would stick with that and use 2 of the 2K Timbren systems such as # A20RS545 if the gross trailer weight capacity is 4,000 pounds. This will offer the proper support as well as distribute the weight as intended and will be more stable than a single, higher capacity Timbren axle-less system. Timbren system # A20RS545 also includes hubs with a 5 on 4-1/2 bolt pattern. If you are using the existing wheels and tires then make sure they have...
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  • Highest Capacity Timbren Axle-Less Suspension w/ a Idler Hub and a 5 on 4-1/2 Lug Pattern
    The highest capacity Timbren Axle-Less suspension we have with a 5 on 4-1/2 idler hub is the 3,500 lbs item # A35RS545. There's no way to increase the capacity on the item # A20RS545 you purchased. You will have to replace them.
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  • 5x10 Cargo Trailer Suspension Upgrade to Timbren Axle Less
    When you say better suspension do you mean stiffer like to support more weight or do you mean something smoother so the trailer is less bouncy? Either way could you get me the axle diameter you have now or the capacity so that I can look into your best option? Most likely you are wanting it to be smoother which we may have a shock kit to help with.
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  • Timbren Axle-Less Suspension System for Snowmobile Trailer 2,990 GVWR
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  • Outside of Tires are Wearing too Quickly
    It sounds like you are not putting enough weight on the axle. Since the arch that axles have are meant to help accommodate the weight, you most likely are not putting enough weight on it. If that doesn't work then I recommend going with a different axle as replacing tires very often can be a bit of an expense. I am linking our selection of axles for you to look through, but I do recommend going with a Timbren axle-less suspension system, like part # A35RS545. These do tend to have a little...
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    Unfortunately, I have no way to see what all components were installed from the factory on your 1996 Wallace single axle trailer. I would need to have measurements or part number for all the different components to verify what is needed. For the axle I would need to know the measurement from the hub face to the hub face on the other side along with the measurement from leaf spring center to leaf spring center. I will also need to know any weight capacities on your trailer to ensure it...
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  • Can Timbren Axle-Less Suspension be Used on a Trailer with an Aluminum C-Channel Frame
    I spoke with my contact at Timbren and he said that the Axle-Less suspension systems such as # A35RS545 can be used on an aluminum trailer frame. He said basically anything that is strong enough (as far as frame construction) can be used. In situations where the trailer may not be all that solid or strong they do provide that square hole on each unit should you need to connect the two sides together for greater stability (not required). The C-channel frame design will be fine assuming...
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  • Can Timbren Axle Less Kit Install on Aluminum Frame Trailer
    You can install Timbren Axle Less kits like the part # A35RS545 on aluminum frame trailers but it would be recommended to use like a rubber spacer/isolator to prevent galvanic corrosion. We don't have anything specific we can recommend but you might check with a local welder to see what they might have. Outside to outside frame dimension would be all you'd need for a crossmember.
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  • Could the Timbren Axle Less System A35RS545 Fit a 1984 Starcraft
    Most likely the Timbren Axle Less System part # A35RS545 would work well on your camper but you would need to compare the dimensional drawings I attached to the setup of your trailer to see if it would clear everything. The hubs are 5 on 4-1/2 inch bolt pattern like it sounds like you would need. Due to the universal nature of this setup I can't really see a reason why these wouldn't fit though.
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  • Replacement For Dexter Torsion Axle On a 2000 Interstate 7 X 12 Enclosed Trailer
    The Timbren Axle-Less Trailer Suspension w Idler Hubs # A35RS545 are going to be the closest replacement to the Dexter 69-47 torsion axle you have under your 7 x 12 Interstate Trailer. These will place the 6" off the frame and place the axle center line 3-13/16" below the trailer frame. The hubs included have a 5 on 4-1/2" bolt pattern.
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  • Recommended Timbren Axle-Less Trailer Suspension System for Boat Trailer
    To fit your boat trailer, I recommend the Timbren Axle-Less Trailer Suspension System w Hubs - Straight Spindle - 5 on 4-1/2 # A35RS545. This system will have the hubs you need as well as the suspension so you don't need to work about the leaf springs. This is a universal fit, so the odd sizing of your current axle and spring centers won't be an issue. You will just need to get a 2 inch square bar to attach to the integrated holes in this assembly. I've attached a video to help, but...
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  • Axle Setup Recommendation for Installing on Movable Shed
    Typically for applications like yours the Timbren Axle Less system like part # A35RS545 which has a 3,500 lb capacity and comes with 5 lug hubs. Instead of a traditional axle it mounts to the frame of the trailer which makes it a bit easier to use in alternative applications like yours.
    view full answer...
  • Do the Timbren Axle-Less Systems with Hubs Come Pre-Assembled
    Assembly is pretty straightforward for the Timbren Axle-Less Trailer Suspension System w Hubs # A35RS545 that you referenced, but no it does not come fully assembled. To see how the parts come in box see the picture I attached. To see how the hubs would assemble on the hub with the included bearings and seals see the video I attached. Fast forward to the 1:20 mark as up to that point the video is focused on removing the seals and bearings.
    view full answer...
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