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  1. Trailer Axles
  2. Timbren
  3. 1200 lbs
  4. Universal Fit
  5. 4 on 4 Inch
  6. No Drop or Lift
Timbren Axle-Less Trailer Suspension w/ Idler Hubs - Standard Duty - No Drop - 4 on 4 - 1,200 lbs

Timbren Axle-Less Trailer Suspension w/ Idler Hubs - Standard Duty - No Drop - 4 on 4 - 1,200 lbs

Item # A12RS440
Our Price: $819.69
Trailer Axles
Shipping Weight: 66 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 (L44649) 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 - 4 on 4 - 1,200 lbs part number A12RS440 can be ordered online at or call 1-800-940-8924 for expert service.
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Timbren Trailer Axles - A12RS440

  • 1200 lbs
  • Universal Fit
  • 4 on 4 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 (L44649) 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: 1,200 lbs
  • Bolt pattern: 4 on 4"
  • Bolt hole diameter: 1/2"
  • Suspension travel: 2-1/4"
  • 3-Year limited warranty

Tire, Wheel, and Hub Compatibility

  • Tire size: 235/85R16 or smaller
  • Wheel diameter: 16" or smaller
  • Bearings (included)
    • Inner: L44649
    • Outer: L44649
  • Races (included)
    • Inner: L44610
    • Outer: L44610
  • Seal: 10-9 (included)
    • Inner diameter: 1.500"
    • Outer diameter: 1.987"

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 5, 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.

Axle-Less dimensions front view

11-3/8" 13-13/16" 1" 5" 3-1/2" 3-3/4"

Axle-Less dimensions top view

4-5/8" 4-7/8" 3-7/8" 3-3/4" 3-1/8"

ASR1200S02 Axleless Trailer Suspension System by Timbren - Standard Height Spindle - 4 on 4" Hubs - 1,200 lbs

88440-2 Timbren Idler Hub Assemblies - 1/2" Studs - Quantity 2

Customer Reviews

Timbren Axle-Less Trailer Suspension w/ Idler Hubs - Standard Duty - No Drop - 4 on 4 - 1,200 lbs - A12RS440

Average Customer Rating:  4.6 out of 5 stars   (288 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 (L44649) and outer (L44649) bearings.


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.



After a year of use, still working well. The trailer tows well and the lower profile is helpful when launching.


Customer service was excellent! Thanks!


Shipped fast. Parts look good.


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.


Five star. shipping was slow. Product was great 14 K 14 plies under 2000 pounds independent suspension. Low fast and sassy. Yep that’s how I build them.


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.


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.


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


Pleased with ETRAILER, will order here again. Not as happy with the torsion axle setup. 2 inch square opening for tying both axles together with your own 2" square tubing are not shaped to match 2x2x1/8 tubing. Grinding and welding of tubing required to make it fit. Also found the overslung stub axle left the end of the pivot arm without much ground clearance though the unit was intended and spec'd for atv tire off road use. A pivot arm with mounting pads top and bottom would be better and allow the user to choose high or low clearance use. I found the units were perfectly suited to offroad use once I fabricated new mounting pads and welded them to the bottom of the arms.


Purchased 2 sets of the Timbren 1200 Axle-less systems for upgrading the suspension on an older 30' ft glider trailer. Single axle with small (13") tires made towing tough due to porpoising, dragging on drive entrances do to poor flotation; also German made and metric, no repair parts. GVW 2000 lbs equated to bouncy ride.

Dual sets now allow the trailer to ride over bumps and sharp inclines easily, smoothly, little bounce on country roads; porpoising is history. My glider now rides securely, safely, quietly.

Install time 4 1/2 hours (includes head-scratching). Results are outstanding, units are totally solid. Recommend the square tube interconnect, easy and quick - trailer frame was on the light side, so a precautionary fix. Clean look underneath.

Ordered 5 wheels w/tires, very nice.

Helpful neighbor so impressed he ordered a HD single set for his new DIY snowmobile trailer.

Customer satisfaction 100%, from phone order, online support, product information, immediate shipping, install instructions, followup... HIGHLY RECOMMENDED!


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.


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.


I used these axles in a different way than most would. I needed a trailer that was small, could handle tight switch-backs, carry 600 lbs and be light. I had this idea and as a retired design engineer I saw a great possibility in this axle. I have made four of these trailers now, one as a camp trailer, 2 for trail work for State Parks and one as a utility trailer.


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.


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.


Very exicited about these axels, I have been eyeing these for over a year. (Excellent service from etrailer, they had my parts to me in 1 day from the time of placing the order.) These axles seem to be well made and fit nicely with the Dexter hub and drum assembly and the 12" electric brake kit. I installed this all on a M1101/M1102 trailer frame after removing the factory axel assembly. I have not ran these on the road or off as of yet but will give another review at that time. The fit and finish are great and the packaging was good, a little banged up from shipping (missing 1 washer)


Timbren saved our RV road trip! The leafs on the axle on our 2018 Jayco TT came apart while driving in Maryland. We tried going to the manufacturer, but they were useless. Going to a RV mechanic meant being grounded for at least 2 months. Then we found Timbren. With the help of Timbren's excellent staff we purchased axle-less system through etrailer, who made sure we got as quick as possible. It came ahead of schedule, my husband installed the Timbren system and we were back on the road! The axle-less system is better than the original manufacturers. If you plan on taking your RV or TT farther than 100 miles GET THIS INSTALLED and get it through etrailer.


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.


These units install easily, are well made, and perform great! The trailer doesn't bounce around like you see a lot of trailers do while traveling down a bumpy road. I traveled some unpaved roads with no issues. I am certainly glad I went axleless. I installed with 15" tires. Problem is I didn't go big enough.

I intended to install on an existing trailer that I had. Changed my mind and built a new trailer. The new trailer came in heavier than I had planned. 2k pound capacity is now too small. I have to watch what I load the trailer with so I don't over load the suspension. I intend on buying the 3500 pound units when I have the money.


enclosed are pics of trailer and spindle units. I was very happy with the end result,
lowering ez loader trailer 8 inches for hovercraft. the spindle units were well made,
very strong but had some weld repairs as pictures show.i could not set the needed
adjustments till I cleaned up the units with a stone and file. also please improve the
packaging . these heavy units need something better than cardboard for shipping.
they were dislodged from Styrofoam and partially poked holes thru cardboard. but
fortunately no damage there. again im happy with the installation.thank you!!!


The order came in on time and the customer service at (Ashley) and Sean from Tmbren was outstanding. They both were very helpful in my choosing the right product for my needs. The axle less suspension's performance is absolutely superb. It vastly improves ride quality. I am using it on a teardrop camper that often goes on gravel roads and the raddling sound from the leaf axles was horrible. A couple of points to consider before you settle on the axle less suspension: keep in mind that you will lose some hight of the trailer. While you will gain clearance from the lack of the axle, the suspension will make the trailer sit lower than before.i had to lower my hitch by an inch to maintain the trailer leveled. Also it does appear to compress at higher rate than the leaf springs, which makes it softer but easier to reach it's limit. Overall this product is absolutely a must if you are looking to improve the safety and the quality of your towing.


This suspension system did EXACTLY what I wanted. I replaced the leaf springs, axle/hubs on my small trailer. The new suspension improved the capacity, lowered the bed 4+inches, improved ground clearance and allowed me to rebalance the trailer all WITHOUT having to have any welding done. Everything needs to be measured very exactly and the alignment technique is fairly cumbersome and takes a bit of time. In the end, I have a quiet, steady, strong, low riding trailer. What more could you ask for

Show More Reviews

See what our Experts say about this Timbren Trailer Axles

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    Converting a torsion axle trailer to a trailer with a Timbren Axle-Less Trailer Suspension System has been done before and most people who have done this really prefer the smoother ride and increased ground clearance. Timbren Axle-Less trailer suspension system is a great alternative to torsion axles. While both systems allow either side of the trailer's suspension to operate independently, only Axle-Less suspensions are actually separate units. Torsion axles still require a bar that...
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  • Is the Spindle Attached to the Assembly on the Timbren Axle-Less Trailer Suspension System
    For the Timbren Axle-Less Trailer Suspension System with Hubs # A12RS440 that you referenced, the spindle is assembled to the backing plate, and you do not have to do any welding. I have checked with my contacts at Timbren, and you will have to install the backing plate on the control arm of your assembly, but this is a bolt on application. Please note that you will need to properly pack the bearings with grease before installing them on the spindle. This is an EZ Lube Spindle, but you...
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  • Axle Recommendation for Small Camper Trailer Towed Behind Motorcycle
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    The Timbren Axle-Less Trailer Suspension System part # A12RS440 can be used on trailers with an aluminum frame. The powder coated bracket will do an okay job of preventing galvanic corrosion but I'd still recommend an extra barrier which could be something as simple as a layer of durable tape between the surfaces.
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  • Dimensions of the Timbren Axle-Less system part # A12RS440
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  • Realigning Axle-less Trailer Suspension on Motorcycle Trailer
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  • Recommended Axle-Less System For Small Trailer
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  • Weight Capacity of Timbren Axle-Less Trailer Suspension System # A12RS440 Explained
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  • Recommended Axle for 3 Foot Wide Dog trailer
    For a 3 foot dog trailer you probably need an axle that is 40 inches from hub face to hub face and has the spring locations that match with your frame. We have an axle-less system that is ideal for your type of application and it includes the suspension needed. I recommend the Timbren Axle-Less Trailer Suspension System with Hubs - 4 on 4 - Regular Tires - 1,200 lbs # A12RS440 which includes the hub assemblies and is compatible with wheels that have a 4 on 4 inch bolt pattern. For your...
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  • Options for Updating Older Thule Utility Trailer with New Hubs and Axle
    I checked with my contact at Thule about the specs for the wheel supplied with their former range of utility trailers. These have not been offered for long enough that they no longer have any parts left nor do they even have access to the specs, such as wheel offset, for those originally supplied. I will still try my best to help you. The linked page displays all trailer wheel/tire combination products with your 4-on-4 wheel bolt pattern and with your tire size 175/80-13. I checked the...
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  • Axle Recommendations for Homemade Motorcycle Trailer
    I can help you determine which Timbren Axle-less system is the right one for your trailer. If your total trailer weight including the weight of the motorcycle is under 400lbs. then the Timbren # A4WS440 system will be a good fit for you. These axle-less systems provide a smooth and quiet ride without having to sacrifice any ground clearance. Depending on what your total trailer weight ends up being you may want to go up to the next highest capacity set rated at 1,200lbs. # A12RS440. If...
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  • Upgraded 2,000 Lb Axle for an Alltrade Trailer
    The weight capacity of a trailer is always going to be limited by its weakest component. The weakest component on a trailer is generally the tires followed by the axle so if you were to upgrade these two components then in theory you will have a higher weight capacity. For a new wheel/tire, I recommend the Kenda 5.30-12 Bias Trailer Tire with 12" White Wheel part # AM30859. This tire comes with a load range D rating which is suitable for use up to 1,250 lbs per side and comes with a two...
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  • Recommended Replacement Spindles and Suspension for Harbor Freight Trailer
    The Harbor Freight trailers are notorious for not being compatible with standard bearing replacement sizes. Unfortunately there is not a simple bearing replacement I can give you. The spindles of those trailers are an odd size that work well only with their bearings which we do not carry. My recommendation is to replace your trailer with a new one of the same quality for the cost of the replacement parts or upgrade your axles to the Timbren Axle-Less Trailer Suspension System with Hubs...
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