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  1. Trailer Axles
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  4. Universal Fit
  5. 5 on 4-1/2
  6. Rubber Spring Suspension
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: $1,425.54
Trailer Axles
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Shipping Weight: 110 lbs
Quantity: 
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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 etrailer.com 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
  • Rubber Spring Suspension
  • Idler Hubs
  • No Drop or Lift
  • 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.


Features:

  • 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


Specs:

  • 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

A B C D E F
13" 15" 1" 5" 3-13/16" 4-1/4"


Axle-Less dimensions top view

G H I J K L
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   (256 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.

by:

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.


Comments
Working out just fine.
David J - 09/25/2020


by:

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.




by:

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.




by:

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




by:

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




by:

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.




by:

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.




by:

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




by:

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




by:

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.




by:

Customer service was excellent and the products were well priced




by:

GREAT PRODUCT BUT THE BEST OF ALL IS CUSTOMER SERVICE, THEY ARE ALWAYS HELPFUL




by:

Great system




by:

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




by:




by:

have not opened the boxes yet




by:




by:

Review from a similar Axle-Less Suspension in Trailer Axles


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.


Comments
Actually over a year, and still working great.
dale - 04/22/2022


by:

Review from a similar Axle-Less Suspension in Trailer Axles


I put these on an off-road trailer build. They have been fantastic! I've done many miles and they held up great. Highly recommend.




by:

Review from a similar Axle-Less Suspension in Trailer Axles


I installed these on my single axle travel trailer to replace the axle and leaf springs. Weight savings was a wash with the required steel tube for added stability. I installed on an I-Beam using aluminum plate as a spacer. It took my friend and I 3 days to install everything. The hardest part was rerouting my black pipe propane line. I also had to install it just back of center due to a steel cross beam being in the way of the middle bolt hole. I replaced the brakes and hubs as well as the wheels to match the new hubs.

Overall we've been super happy with this upgrade. The trailer rides a lot smoother. I'm not finding random screws on the floor after a long bump ride.

We decided to do this after our leaf spring broke 2 times, 12k miles between. We were done dealing with a subpar suspension. I probably would not recommend doing this if your leaf springs are working for you. We put a lot of miles on our trailer. We aren't weekend campers.


Comments
1 year later still working great! Very happy with the performance. We have driven at least 20k miles with these springs and have not had a single issue. I also am happy I upgraded weight limits on everything.
Elizabeth - 11/18/2022


by:

Review from a similar Axle-Less Suspension in Trailer Axles


Trailer suspension and disk brake performance is outstanding big big difference over leaf spring and electric drum brakes.
Installation required modifications to the frame to monut the timbren suspension


Comments
The Timbren axle less suspension and Disk brake and disk brake controller system is still work great. will never go back to drum brakes or leaf spring axle suspension.
Quintin - 01/06/2022


by:

Review from a similar Axle-Less Suspension in Trailer Axles


Actual trailer weight 1540#, 210# tongue weight. 1310# suspension load. After 600 miles, both springs collapsed making the suspension rigid. Have received replacement springs from Timbren but haven't had a chance to try them out.




by:

Review from a similar Axle-Less Suspension in Trailer Axles


They have more pros than cons, but the second set I bought broke the flat plate that holds the spindle at about 8 months. The steel quality seemed less than I would expect since it basically peeled it back like a pop can as you can see in the pictures. Otherwise I like the clearance and ride. They last 2-3 years where the torsion axles I replaced would wear out in 4 months after driving down rough gravel roads. There is a grade zerk on the underside which I didn't realize until I bought the second set. That would have helped the first set last longer had I known about it.


Comments
The Timbren Axle-Less Trailer Suspension - 4 Spindle w Brake Flange - Regular Tires - 7K Part # TASR7KS02 has a 3-year limited warranty. I will have Customer Service reach out to you.
-- Etrailer Expert Thomas M - 12/22/2021


by:

Review from a similar Axle-Less Suspension in Trailer Axles


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.




by:

Review from a similar Axle-Less Suspension in Trailer Axles


Needed a suspension system that I could make a low profile kayak trailer, that would fit in a specific area next to my garage. These were excellent that I could make the trailer any width I wanted. Easy to install and well made.



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    Image 1 for Image 2 for
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  • Could the Timbren Axle Less System A35RS545 Fit a 1984 Starcraft
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  • Timbren Axle Less Kit for Sea Lion SK-20-2200 Over Torsion Axle
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Do you have a question about this Trailer Axle?




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Info for this part was:

Employee Mike L
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