1. Trailer Leaf Spring Suspension
  2. Timbren
  3. Axle Replacement System
  4. Axles
  5. Universal Fit
  6. 3500 lbs
Timbren Axle-Less Trailer Suspension System - 4" Drop Spindle Only - 3,500 lbs

Timbren Axle-Less Trailer Suspension System - 4" Drop Spindle Only - 3,500 lbs

Item # ASR3500S04
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Trailer Leaf Spring Suspension
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ASR3500S04 - 3500 lbs Timbren Trailer Leaf Spring Suspension
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The Axle-Less system provides a smooth, quiet, safe ride and can eliminate the need for an axle. Suspension units replace your existing axle and operate independently. The 4" drop spindle allows for a low deck height. Fits any frame width. Lowest Prices for the best trailer leaf spring suspension from Timbren. Timbren Axle-Less Trailer Suspension System - 4" Drop Spindle Only - 3,500 lbs part number ASR3500S04 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (134)
  • Q & A (31)
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Timbren Trailer Leaf Spring Suspension - ASR3500S04

  • Axle Replacement System
  • Axles
  • Universal Fit
  • 3500 lbs
  • Timbren
  • Spindles Only

The Axle-Less system provides a smooth, quiet, safe ride and can eliminate the need for an axle. Suspension units replace your existing axle and operate independently. The 4" drop spindle allows for a low deck height. Fits any frame width.


Features:

  • Suspension system provides a safe, smooth, quiet ride for your trailer
    • 2 Separate units replace your existing axle
  • AEON progressive-rate main springs absorb road shock and support trailer's load
    • Deliver a smooth, stable ride, regardless of load size
    • Compress and become stiffer as load increases, boosting spring strength
  • Rebound springs act as return devices to minimize rattle and bottoming out
    • Create constant pressure on the arm, so the suspension is never completely relaxed
  • 2 Independent units can eliminate the need for a thru axle
    • Increase ground clearance
    • Lower deck height for easier loading and unloading
    • Reduce roll during cornering
    • Fit any trailer width
  • Built-in camber and toe-in help your trailer to track straight, reducing wear on the tires
  • 4" Drop, EZ Lube spindles accept trailer hubs (sold separately)
    • 4" Drop provides lower ground clearance
    • Spindles can be easily removed from units for simple replacement if damaged
  • Heavy-duty steel construction with black powder coat finish resists wear and corrosion
  • Easy to install and align
    • Bolt or weld to your trailer's frame


Specs:

  • Fits: 1-axle and 2-axle trailers that use regular tires
    • Not recommended for triple-axle applications
  • Weight capacity: 3,500 lbs
  • Quantity: 2 suspension units without hubs
    • Works with Dexter 1,750-lb hubs (84545UC1-EZ)
  • Spindle/Hub compatibility:
    • Bearings: L68149 inner, L44649 outer
    • Races: L68111 inner, L44610 outer
    • Seal: 10-19
  • 3-Year limited warranty


Note: The Timbren Axle-Less suspension system may require additional support on your trailer. If your trailer does not have a crossmember above the spot where you want to install the Timbren system, you may need to reinforce the frame. You can accomplish this three ways. First, you can retrofit the trailer with a crossmember. Second, you can build out the trailer frame. Third, you can use standard, 2-inch steel tubing to connect the 2 Timbren suspensions together using the built-in square hole on each unit.


Ground Clearance

Ride on rubber with Timbren's Axle-Less trailer suspension system. This one-of-a-kind suspension consists of two separate units, each containing rugged steel arms and two strong, hollow rubber springs. Overall, the system safely and effectively absorbs road shock, minimizes trailer bounce and rattle - regardless of load size - and helps to protect your trailer's components and cargo. Built-in camber and toe-in keep your trailer tracking straight to minimize tire wear. Integrated hangers attach to your trailer's frame. And 2-inch holes make it easy to reinforce your trailer's frame by adding standard, 2-inch-square steel tubing (if needed).


The Axle-Less independent suspension system replaces your trailer's existing leaf spring suspension and can eliminate the need for an axle. The independent action of the suspension reduces roll when your trailer is cornering and allows you to maximize ground clearance and minimize deck height. Your trailer can have the same side-to-side clearance as your tow vehicle. And the low deck height makes it easy to load cargo from either the rear or the side.


Because you're riding on rubber, your trailer will ride smoothly and comfortably, whether you're navigating rocky terrain or highway asphalt.


Timbren Axle-Less Suspension Parts

Components

  1. The AEON progressive-rate main spring supports the weight of your trailer and cargo and easily absorbs road shock. It is constructed of heavy-duty, hollow rubber.
  2. The rebound spring minimizes trailer bounce, rattle and bottoming out. It keeps the suspension under constant tension and ensures that the main spring compresses and expands in a controlled fashion. And it delivers a smooth, stable ride - regardless of how much cargo is on the trailer.
  3. The trailing arm and integrated hanger attach 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 urethane bushings that never require lubrication.
  5. The EZ lube, 4" drop spindle (straight model shown) is simple to grease. If damaged, it can be removed and replaced, saving you both time and money.
  6. The hub is not included with this model.
  7. The built-in square hole accepts standard 2-inch tubing. If there is no crossmember above the suspension, you can easily add support to your trailer's frame by inserting 2-inch steel tubing through the hole on each suspension unit and then bolting the tubing into place.

Timbren Axle-Less Suspension versus Leaf Springs

Leaf Spring Example

The Axle-Less suspension's progressive spring is a definitive upgrade over leaf springs. Although leaf springs deliver a stable ride when supporting a load, a trailer with leaf springs will bounce and rattle when it's empty or supporting a light or off-center load. On the other hand, your trailer can bottom out on bumpy roads if the load is too heavy. The AEON progressive-rate springs of the Axle-Less suspension always deliver the same reliable performance, no matter the load size. As more weight is added to the trailer, the springs compress and become stiffer, offering more support for heavy loads. And because they rebound more slowly than leaf springs, the AEON springs do a better job of absorbing road shock, thereby keeping your trailer from bouncing and rattling when you're carrying a light load. So with this versatile system you will enjoy a smooth ride whether you're towing an empty trailer or a hefty load.


Unlike leaf springs, Timbren's Axle-Less suspension units operate independently of one another. Each spring activates only when needed. This reduces roll and delivers top-notch performance, even when you're hauling off-center loads. When your trailer with leaf springs takes a turn, one side of the suspension compresses and takes on more weight, and the other side becomes looser and bounces. This causes rattle and can make the trailer lean to one side. But when your trailer with the Axle-Less suspension takes a turn, one side compresses and becomes more rigid to absorb the weight, and the other side expands to normal height to help steady the load and minimize bounce and rattle. The load stays better balanced, even if it is off-center.


Timbren Axle-Less Suspension versus Torsion Axles

Torsion Axle Example

Timbren's 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 spans the bottom of your trailer, whereas Timbren's system can eliminate the need for a thru axle - giving you the same amount of ground clearance from the front of your trailer to the rear. It also allows Axle-Less suspensions to fit any trailer width - unlike torsion axles, which have to be fitted to an exact frame width.


Axle-Less suspensions operate in a smoother, less stressful manner than torsion axles. Torsion axles use a twisting motion, where the bar inside the axle tube rolls against rubber cords or a rubber wall to create compression and resistance. The up-and-down motion of the main spring and the side-to-side motion of the rebound spring in Timbren's Axle-Less suspension work together to provide smooth, consistent compression - with no twisting - that results in a better ride and less stress on the suspension's components.


Installing the Timbren Axle-Less Suspension

Whether you are building a trailer or retrofitting your existing trailer with the Axle-Less system, you must make certain that the trailer's frame is both perfectly square and sturdy enough to support a heavy load without the aid of a thru axle.


Install Option 1

There are three ways to install the Axle-Less suspension. The easiest method, which is recommended if you are replacing axles on your trailer, is to install a piece of 2-inch-square tubing (sold separately - available at most weld shops) through the integrated hole in the Axle-Less suspension. Then all you need to do is bolt the suspension to the side of the trailer's frame with three bolts (not included).


Install Option 2

The second option for installation is to fabricate an inboard extension plate that attaches the trailer's frame to the Axle-Less suspension.


Install Option 3

The third method of installation is to bolt the Axle-Less suspension's hanger to the trailer's frame and to an existing crossmember that is in the area where you want to install the suspension.


With both the second and third options, you must use three bolts to attach the suspension to the side of the frame. And you also have to use two or three bolts to attach the suspension to the bottom of the frame extension, or crossmember. Both the second and third methods of installation will eliminate the need for a thru axle and provide the most clearance.


Measuring Diagram

Timbren's Axle-Less suspension units should be installed directly across from one another. Before mounting the units, measure back from the coupler and mark the frame to make sure that the two distance measurements (A and B) are within 1/8 inch of each other. Then you can drill holes through the frame and attach the hangers with Grade-5, half-inch bolts (not included).


Dimensions of the Timbren Axle-Less Suspension

The following diagrams show measurements that were taken with electric drum brakes installed on the Timbren Axle-less suspension system.


Dimensions 1

Dimensions 2

Dimensions 3

Dimensions 4



ASR3500S04 Axleless Trailer Suspension System by Timbren - 4" Drop Spindle - Without Hubs - Regular Tires - 3500 lbs






Customer Reviews

Timbren Axle-Less Trailer Suspension System - 4" Drop Spindle Only - 3,500 lbs - ASR3500S04

Average Customer Rating:  4.6 out of 5 stars   (134 Customer Reviews)

The Axle-Less system provides a smooth, quiet, safe ride and can eliminate the need for an axle. Suspension units replace your existing axle and operate independently. The 4" drop spindle allows for a low deck height. Fits any frame width.

- ASR3500S04
by:

Product looks great. I had to some leg work to get shipping moved along but otherwise satisfied. 589790



- ASR3500S04
by:

My trailer is an enclosed race car carrier originally built with dual axles and leaf springs. The maximum weight of the trailer and load would be about 5,000lb. This Timbren product is well engineered, well constructed and does what it is designed to do. Much better system than the dual axle, leaf spring set up. Installation may me a bit more complicated than the videos or supplied directions indicate. Look at the videos and directions and your trailer and plan ahead. Take measurements, decide on how to reinforce the frame and buy high quality hardware if you plan on bolting everything together. This Timbren product would be a great choice if you were building a trailer from scratch. Choosing to convert an existing trailer suspension is a more complicated choice. For me it was worth the effort. 440878



- ASR3500S04
by:

Packaging very good and shipping fast. Excellent communication and shipment was tracked by company representative. 230603



- A12WS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Good product and easy to install on my new build of a off road trailer for my side by side. Thanks 628307


Comments
This has been a great product and works great and was easy to install
John V - 04/14/2020

73224

- A20RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


This is my first time in building something like this 774926



- ASR2KHDS05
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Built a custom trailer to haul an ATV on some bad rural roads in Baja. I used the 2" drop axel-less suspension to allow for full size tires and wheels yet keep center of gravity low. Easy to install on exposed frame, but note that a required brace or 2" square steel bar may be needed and sourced on your own. The finish is not very durable and does not survive the normal bumps, wrench scrapes and scratches of installation; plan on some touch up once installed. Pay attention to the spindle clearance and wheel offset. 317250



- A35RD545E
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Extremely good product. Rides much better than traditional leaf springs. Ordering. A 7,000lb 8 lug set for the big trailer. 593860



- ASR5200S01
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


A little bit pricey, at first. But in the long run they are cheaper. We used to bend or break an axle every 3 or 4 months. But we have had these a couple of years now with no problems. One thing that is nice is on a tandem axle set up you can get a flat and you just have to take the wheel off and run on 3 or 2 wheels without the hubs hitting the ground. 593458



- ASR1THDS03
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


I installed these on a small jeep style camping trailer that I built. I plated my frame and also used the suggested two inch square tubing to tie them together. It rides very well, looks like it should be very durable, it's a simple design, simple to install, more economical than other independent systems, has less parts to go bad than other systems, I would highly recommend to any body using a trailer on rough roads! 582196


Comments
We just drove 1200 miles mostly at 75mph. The axles work very well in all conditions, trailer ride very smoothly.
PhilTreeMan - 11/20/2019

63425

- ASR5200S01
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Timbren Axle-Less Suspension - Spindle Only - Regular Tires - 5200 lbs Item # ASR5200S01 Looks great on empty trailer, idea is good, bad execution. When loaded tires "splay out" severely, excessive tire wear, obviously too much play in system somewhere. 584361


Comments
Excessive camber which causes wear on the portion of the tire tread closest to the trailer can be caused by a few different things. 1 The axle-less suspension system has a 5200 lb per set capacity, so youll want to be sure this amount is not being exceeded. 2 The surface of the trailer that the suspension member is added to needs to be an integral part of the trailer that should have NO give in it whatsoever. Any flexing of the side member there will throw off the camber of the tires. I have seen what you describe occur when the suspension system has been mounted to tubular steel that made up the edge of the trailer frame. In that instance, some angle iron was added to stiffen things up. 3 Its not required, but a piece of 2x3 inch tube steel of the appropriate length can be used as a beam connecting the two sides, utilizing the existing hole in the axle-less suspension member. This will help stiffen things up. 4 The suspension system should have included some shims that can be used where the spindle attaches to the suspension portion of the assembly. Using these shims can decrease the camber, but only if the points mentioned above are taken care of. Ive checked with Timbren regarding the above, and they concur.
-- Mike L - 11/21/2018

45920

- A12WS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


I am pleased with the Timbren Axle-Less Trailer Suspension System with Hubs - 5 on 4-1/2 - Off-Road Tires - 1,200 lbs. I had a project and it worked out just fine. 254872



- A20RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


I pull my Sea Doo GTX 300 (that means they are pretty heavy!) PWC's from Wisconsin to Florida twice a year. That said, this last trip to Florida caused me to bend the original straight axle on my trailer. Not fun. I ordered the Timbress Axle -less axles, and after a few hours of work on the trailer, they were installed, square and true. I immediately put the Sea Doos on the trailer to see how the trailer performs with the new axle-less system on it. one word: FANTASTIC!!!! I guarantee if I have to fix this issue again, I will use the exact same product. It is awesome! 736299



- ASR3500S06
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


The suspension I ordered is of high quality and I received it sooner than I expected , its good to do business with a company that produces its products so fast. 271528



- A12WS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


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! 580744


Comments
I have just a little more to add regarding my purchase: Two sets, of the Timbren Axle-less assemblies, 1200 lb, and 5 wheels. I placed the order via phone, and whoever was on-call that day provided great answers and recommendations regarding the units, wheels and tires. At 31 feet, the trailer originally exhibited amplified porpoising on any bumps or dips in the road. Also bouncing and occasional sideways tipping due to the single axle. It made a lot of noise on my mountain community washboards. I speculated that the Timbren units would solve most, if not all of these problems and they have. Installation on my older 31 ft European ie, metric and no longer manufactured glider trailer was a mere 4.5 hours from removal of the old single axle to setting the trailer back down on its new assemblies. Instructions are complete, precise, useful and helpful. Appreciated. Little to comment on as installation was all straight-forward. I would like to describe the maiden voyage to the airport and back, but there is nothing to tell, other than it towed beautifully proper alignment instructions, and all that I viewed from the rear view mirror looked like a magic carpet ride. It rides over washboards and pot holes like a marathon hurdler, the 4-wheel independent suspension is great. Packaging: the shipping boxes all arrived in good condition, but the cardboard component boxes inside them... not so much. Most were ripped and open due to heavy components lightly surrounded with brown packing paper, just token amounts. Parts: all was accounted for minus a pair of spindle axle washers for one set, easily replaced at the local farm and ranch supply. No squawk, just an fyi. I am very pleased with your product and support, and was happy to leave a 5-star review with photos. The upgraded suspension was also a topic this past weekend at the glider port by those who regularly trailer their ships to various soaring events, some as far as a thousand miles away. My compliments to eTrailers, hope you can use my info,
-- comment by: Kelly F - 11/28/2018

46128

- A35RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


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. 263087



- ASR2KHDS05
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


I was looking for a low profile axle system for my motorcycle trailer. The primary requirement was to be able to load my motorcycle by myself which required a low-profile trailer. With the 4" drop provided by Timbren, this setup turned out great. I originally intended on using ramps but after I swapped the leaf spring axle out with the Timbren, I found I was able to ride my motorcycle on/off without the need for the ramps. Originally, I was going to go axle-less but I found when torquing down the assembly to my frame it started to compress the aluminum rail. To take the pressure off the frame I added the 2" bar from axle to axle. Pulls smooth and effortlessly. I've had several people comment on the trailer height with one wanting to buy the trailer from me. This person worked at the local Honda Dealership. He thought it was a great design and I would imagine he's seen a variety of trailers come through his lot. The other option I considered was a torsion axle but I was looking for the lowest profile I could get. Therefore, cost was not a key factor. I also like the soft ride the Timbren system provides. Not sure if the torsion design would have been as smooth over bumpy roads. Regardless, I'm pleased with how this project came out. 352952


Comments
Its been a year since Ive installed the new axles on my trailer my comments above still hold true. Im very pleased with the ride quality of the system after a year. The trailer tracks true and has hauled many things other than my motorcycle. Even empty it doesnt hop around like the original stock straight axle did. No regrets on the purchase.
Pat A - 03/15/2018

35909

- ASR3500S06
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Only been driving around on the axle-less system for about a week now and it has far exceeded expectations. I get better gas mileage, my trailer now sits like it was intended to, my trailer doesn't bounce like it used to, I wouldn't trade this axle system for any other. Just wish I would have known which outboard assembly arm my trailer needed with the axle-less system before I placed my order. Still not a problem though, plan on using the wrong outboard arm to build a different trailer. So far, a great product! 208571



- A20RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


not happy with one lug nut missing threads!!! but I think they also could supply the wedge plate! the horizontal holes never change and the lower vertical should be slots. for the money I shouldn't have to make a plate. 202996



- A20RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Built very rugged. I am glad this is available because all the 2K axles I found were not wide enough for my application. This setup allowed me to keep expenses down and build the trailer I wanted. 326161



- ASR2KHDS03
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Excellent, helpful customer service sold me this product, and trust me when I say it's worth the price tag. Pulled the old axle and leaf spring off a 60's era Bantam and swapped out for this with a support bar in between. Bumped up tires to 315/75r16 BFG TA/KO's to match my rig and am amazed at how much better this trailer now pulls. Empty it wad bouncing all over the place with the old axle and leaf spring setup. Now I hardly even know it's there. Was very easy to install, took a couple hours but I am happy with how it turned out. A+++ product and customer service! 172019


Comments
HI Matt,WHat size wheel did you use and which hub did you get to match?Appreciate the info
-- comment by: Conrad S - 04/01/2015

10523
Comments
They are GREAT! I put them on a small offroad trailer that has followed me all over some really rough roads in remote Oregon, Washington, and Idaho. They have performed flawlessly, helped the trailer tow extremely well, and were the single best upgrade I did to that trailer. Very much looking forward to another summer of exploring! Massive upgrade to the stock axle leaf spring combo, and I have had the opportunity to show it off to alot of fellow overlanders. I cant speak high enough of them. I also purchased a set of airbags for my vehicle which unfortunately have not held up terribly well. I have had to field repair one once already, and neither holds air terribly well. Truth be told they seem very underdesigned for the job they perform. From my super secret high tech pocket internet window.
Matt N - 02/06/2016

16696

- ASR2KHDS02
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Great looking parts, robust design, professional looking welds....Nothing missing... I contacted Timbren prior to my purchase and received a prompt, helpful reply... The supplied instructions are complete and straight forward, i'm confident should i have any issues, contacting them will get them resolved... 286117



- A20RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


This is my favorite suspension system in all the world! Rides like an absolute dream. Easy to set up and install. Works on any trailer frame size. One thing to know: You don't get the ride height you get with a standard leaf spring suspension. Even with 15-inch wheels, the ride height is pretty low - maybe 10-12 inches of ground clearance to the bottom of the main trailer frame. If you need more ride height, get the lifted version. A few areas of possible improvement? It's difficult to bolt the suspension unit to a crossmember using the middle bolted hole, which uses a tacked-on weld nut. You have zero room for error when drilling the hole through your cross member, and you can't really use the suspension as a template. Hmmm ... also, the hanger plate mounting holes are positioned 1-inch from the bottom of the trailer frame. That makes it very difficult, since I use channel side rails, to use standard 1/2-inch USS or SAE washers on the backside. There isn't room. Just an extra 1/4 of a inch would allow me to use standard washers underneath the nuts on a channel frame. Nitpicking aside, it's amazing. 410020



- A20RS440
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Everything was as advertised! Fast shipping and well packaged! And good quality. And the best part, they respond very fast to my emails!! very nice! Don't think all be using my local retailers anymore. 556069



- TASR35HDS06
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


We buy a number of things from E trailer and have always found there support and online cataloging very helpfull. 318927



- A20RS545
by:

Review from a similar Axle-Less in Trailer Leaf Spring Suspension


Only axle I could find to fit my application. Very cool product. Fast delivery. Easy instructions 642073


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Ask the Experts about this Timbren Trailer Leaf Spring Suspension

  • Recommended Hubs and Hydraulic Brakes for Timbren 3,500 Pound Axle-Less System # ASR3500S04
    For hub drums that will work perfectly with the Timbren 3,500 Axle-Less System # ASR3500S04 referenced in your question I recommend the etrailer.com # AKHD-5475-35-K. These hubs are compatible with the spindles on the Timbren system and their 5 on 4-3/4 inch bolt pattern will fit your existing wheels. Then for hydraulic brake assemblies that will work with these hubs I recommend the etrailer.com # AKUBRK-35R for the Right Side and # AKFBBRK-35L for the Left Side. These particular assemblies...
    view full answer...
  • Recommended Hubs for Timbren 3,500 Lb Drop Axle-Less System with 5 on 4-3/4 Inch Bolt Pattern
    The Trailer Idler Hub Assembly part # AKIHUB-5475-35-EZ-K is compatible with the Timbren Axle-Less Trailer Suspension System part # ASR3500S04 and has the 5 on 4-3/4" bolt pattern you are after. If you want to add brakes you would need the Trailer Hub and Drum Assembly part # AKHD-5475-35-EZ-K and Electric Trailer Brake Kit part # AKEBRK-35-SA instead. Also, the Mounting Hardware for 10" Brake Assemblies part # BRKH10B would be needed if adding brakes. The Timbren Axle-Less Trailer Suspension...
    view full answer...
  • Recommended Disc Brakes for Timbren Axle-Less Suspension Systems
    Disc brakes can be used with the Timbren Axle-Less Suspension systems, however, Timbren does not offer an axle-less suspension kit with disc brakes. If you want to use disc brakes, I recommend buying the Axle-Less Suspension System - 3,500 lbs, # ASR3500S04, which you reference, along with the Kodiak Disc Brake Kit - 3,500 lbs, # K2HR35D. Buying the Timbren Axle-Less Suspension system without the hub and buying the disc brakes separately will save you money over buying a kit that includes...
    view full answer...
  • Replacing Torsion Axle with Timbren Axle-Less Suspension System on Boat Trailer
    You can definitely replace the torsion axle on your trailer with a Timbren Axle-Less Trailer Suspension System like the 3,500 pound # ASR3500S04 referenced in your question. Since you will be replacing your axle, the easiest way to install this system will be to install a piece of 2-inch-square tubing through the integrated hole in the Axle-Less suspension. Then you will just need to bolt the suspension to the side of the trailer's frame with three bolts. You will just need to make sure...
    view full answer...
  • Can a Leaf Spring Axle be Replaced by a Timbren Axle-Less System?
    Yes, you can replace a leaf-spring axle with a torsion axle on trailers. I would give you a recommendation but unfortunately we do not carry torsion axles. Just be sure you replace your current axle with one that has the same weight capacity.
    view full answer...
  • Can Timbren Axle Less System Be Used on I Beam Trailer and with Disc Brakes
    Triple axle trailer scrub tires pretty hard around corners which can put quite a bit of lateral force on the sides of the axle assemblies. The Timbren axles just are not rated to withstand that amount of force in that direction. Installation of a Timren Axle Less like part # ASR3500S04 on I-Beam trailer frames is possible but will require you to basically box off the open end of the frame where the system will install so that it has something to install on. Disc brakes can be used...
    view full answer...
  • How Far Does the Timbren Axle-Less Trailer System Drop When the Trailer is Raised
    I spoke to my contact at Timbren and he informed me that if you were to jack up a trailer with a Timbren Axle-Less Trailer Suspension System # ASR3500S04 installed it would only drop as much as the suspension system had compressed from the weight of the trailer. The rubber spring is attached at the bottom and top of the assembly so it would not just swing down when the load was removed.
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  • Determining if Installing Timbren Axle-Less System Will Change Trailer Ride Height
    The Timbren Axle-Less Systems come in a variety of different spindle designs that may allow you to increase, decrease, or simply maintain your trailer's current ride height. The Timbren 3,500 Pound # ASR3500S04 that you were looking at features 4 inch drop spindles which would lower the ground clearance on the trailer. It's hard to say how much this would differ from your current setup since it depends on exactly what kind of torsion axles you have, but I can tell you that this system...
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  • Is the Capacity of the Timbren Axle-Less Trailer Suspension System Per Side or Total
    For a Timbren Axle-Less Trailer Suspension System with a 7,000 lb capacity you will want to use part # TASR7KS02 which has the same 4" drop as the Timbren Axle-Less Trailer Suspension System part # ASR3500S04 that you referenced. The part # ASR3500S04 has a total weight capacity of 3,500 lbs, not per side. If you need the braking assemblies and hub/drum for the 7,000 lb system then you can use part # 42866UC3-EZ for the hub/drum and part # 23-105-106 for the braking assemblies. I have...
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  • Compatibility of Timbren Axle-Less Suspension System # ASR3500S04 With Existing Trailer Brakes
    The brake flanges installed on the Timbren Axle-Less Trailer Suspension System # ASR3500S04 are standard 4-bolt types that are quite common. You can check your electric brake assemblies to confirm they use the same mounting bolt pattern. If they fit and still have plenty of life left in them then you're fine to re-install them on the Timbrens. You also need to confirm the bearings used in your existing hubs to ensure your hubs' compatibility with the spindles in this kit. If your current...
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  • Replacement Brakes and Hubs for a Vintage Trailer with Warner Brakes
    Unfortunately, we do not have the 14” diameter x 2” wide braking assemblies you need for your trailer. I also did some searching online and could not find any replacement parts for you either. The only option I can offer you would be to replace with a more common size. In order to do so I would need you to measure your brake mounting flange bolt pattern in addition to your inner bearing, outer bearing, and grease seal. I have attached a help article on how to measure the bearing/seals for...
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  • Adding Axle-Less Suspension System on a 1979 Avion Travel Trailer With Existing Axles
    In order to potentially add a Timbren Axle-Less suspension system to your 1979 Avion travel trailer, there are few things to consider: Adding an Axle-Less system will most likely require extensive modification of your trailer and re-aligning of your current axles. The reason you will need to modify your travel trailer is because the wheel well is not large enough to accommodate a third axle. It's also necessary to re-align your axles because the center point of the axles will change...
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  • Can Kodiak Disc Brakes be Added to 3,500 Pound Timbren Axle-Less Suspension System
    The Timbren axle-less system # ASR3500S04 using 10-19 seals, # RG06-050. All of the Kodiak disc brake kits for 3,500 pound axles use this same seal so you will be able to use the brakes on the Timbren axle-less system. Assuming the combined weight of the boat and trailer is under 3,500 pounds then the axle-less system will work fine. To get some idea of the weight you can take the boat and trailer (as it is now) and weigh it at a truck scale or a place that sells bulk gravel might be...
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  • Will Timbren Axle-Less Trailer Suspension System Work Well On Small Custom Utility Trailer
    With the trailer towing up to 5,000-lbs you can replace both axles on your trailer with 2 sets of the Timbren Axle-Less Trailer Suspension System, part # ASR3500S04, and they will be more than sufficient. The system is designed to make the ride much smoother regardless whether you are hauling a load or not. The progressive springs get stiffer as more weight is added but are always engaged to reduce rattle and bottoming out. The axle-less system does come with a 4-bolt brake flange installed...
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  • Can Axle-Less System Be Used To Replace 2 Axles On 26 Ft 1979 Avion Travel Trailer
    Using an axle-less system will work for your trailer. There are some things you want to consider when using an axle-less system. You will want to make sure you install axles that have the same distance from the frame to the center of the wheel hub. This will allow the trailer to remain level when towing and will not put more weight or stress on the front or the rear axles. You will need to know the weight capacity you need for the axles and if you want straight axles or axles with...
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  • If Trailer Is Lifted Off the Ground Will the Timbren Axle-Less Trailer Suspension System Come Apart
    That should not be able to happen because the rubber spring is attached to the 2 parts. So unless it was already taken apart or something was broken the lower part should not be able to separate from the upper part of the Timbren Axle-Less Trailer Suspension System, # ASR3500S04.
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  • Hubs with 5 on 5 Bolt Pattern that Will Fit a Timbren Axle-Less Suspension System
    There are Timbren axle-less suspension systems that do not come with hubs so that you could add your own such as # AKIHUB-550-35-EZ-K. But the hubs with 5 on 5 bolt patterns that would also fit a Timbren system only accept up to 15 inch wheels. The other issue is that vehicle wheels are not meant to be used on trailers and often have an offset (mounting surface of wheel not in the dead center of the wheel) whereas most trailers take wheels with a zero offset. With that said the hub listed...
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  • Can Disc Brakes be Added to the Timbren Axle-Less Suspension Systems
    The 3,500 lb weight capacity of the Timbren Axle-Less Trailer Suspension System, # A35RD545E, is the weight capacity for the pair, not per side. Disc brakes can be used with the Timbren Axle-Less Suspension systems, however, Timbren does not offer an axle-less suspension kit with disc brakes. If you want to use disc brakes, I recommend buying the Axle-Less Suspension System - 3,500 lbs, # ASR3500S04, and the Kodiak Disc Brake Kit - 3,500 lbs, # K2HR35D. Buying the Timbren Axle-Less...
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  • How To Lower a Trailer 3 Inches
    I am not really sure what the dealership was referring to as a 22 axle but we do have options for you to lower your trailer. The first option if you have a leaf spring axle is an over/under kit like the Dexter Trailer Springs Over-Under Conversion Kit part # K71-384-00 or part # K71-385-00 but this would only work if your leaf springs are over the axle, not under. If your leaf springs are already under the axle then the next best option would be to replace the axle with one that has a drop...
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  • Dimension Drawing for the Timbren Axle-Less Suspension System # ASR3500S05
    I attached a picture that shows all of the dimensions of the Timbren Axle-Less Suspension System, # ASR3500S05 that you are interested in. Since I don't know much about your setup the best recommendation I can make would be for you to check out the dimensions I attached and if you decide you do need a 4 inch drop you would want the part # ASR3500S04 instead.
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  • Replacement Drop Axle for Old Horse Trailer with 6 on 5-1/2 Inch Bolt Pattern
    I would love to help but we do not have any trailer hubs that correspond to the dimensions that you provided. Therefore, the only option we can offer you would be to replace the axle all together. In order to offer a replacement for this we would need to know your spring center and hub face measurements (see photo). If you can provide me with these I can then see if we have an axle suitable for your trailer. For example, the Dexter Trailer Axle Beam with 4" Drop E-Z Lube Spindle part...
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  • Replacement 3500 Pound Axle for Basstracker V17 Boat Trailer
    The closest axle we have to fit your measurements is the Dexter Axle # T3584F-EZ-8974. This has a hub face of 89 inches, spring center of 74 inches, 3500 pound capacity and EZ-Lube Spindles. It is not a drop axle like yours is currently. To gain the drop you can use the Timbren Axle-Less System with 4 inch Drop # ASR3500S04. The axle-less systems provide a suspension without the traditional cross tube axle.
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  • Timbren Axle-Less Suspension System for Off-Road Tear Camper
    There is a lot to unpack here so I'll try address your concerns as best I can. First, you should not use a spacer of any kind to ensure your wheels fit; this would cause potential installation issues with the overall assembly not to mention void the warranties on each of the products you are looking at. The problem is if you need 8 inches to the hub face like what you get with the Timbren Heavy-Duty Axle-Less Trailer Suspension # ASR35HDS01. If this is a requirement for your wheels...
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  • How Long Is a 3500-lb Axle for a 5 x 10-Foot Utility Trailer
    All of the 3500-lb-rated trailer axles that we offer are 89-inches in length from hub face to hub face and have spring seats at a 74-inch spacing. Your 3500-lb axle may be different so you'll want to measure your hub face and spring seat dimensions. All such axles are shown on the link provided for you. We offer kits with hubs or without, with electric brakes or without and even axle-less suspensions like the Timbren # ASR3500S04. The unique suspension systems do not require an axle beam...
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  • What is the Weight Capacity of Set of 4 Timbren Axle-Less Suspension Set Up As Tandem Axles
    Each paired set of the Timbren Axle-Less Suspension, like # ASR5200S04 and # ASR3500S04, can be compared as one traditional axle when trying to compare the weight capacities. The Timbren # ASR5200S04 are rated at 5,200 lbs or 2,600 per Timbren unit. If you install 4 total in a tandem axle set-up, then the weight capacity would be 10,400 lbs on the axles. The Timbren # ASR3500S04 are rated at 3,500 lbs per pair and in a tandem set-up the axle capacity will be 7,000 lbs.
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  • How to Select Axle for Fabricating Car Hauler Trailer with GVWR of 2200-lbs
    We do not sell torsion axles but they will carry a weight capacity rating just like leaf spring beam axles, which we do offer. A torsion axle can be used continuously up to its rated capacity so long as there is no deterioration to the rubber cords inside it. This can be tough to determine visually but if you can see ANY of the cord exposed (due to "torsion creep") then the axle is done and should be replaced. For a trailer that will have a gross loaded weight of 2200-lbs you could use...
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  • Availability of Lift and Drop Versions of Timbren 3,500 lb Axle Less System
    We do have the 3,500 lb Timbren Axle Less kits in a few different variations. I attached a link to a page that has all of them listed but for a 4 inch lift for off-road (wider) tires we have the part # ASR35HDS02, 4 inch lift for standard tires part # ASR3500S06. For a 4 inch drop like you mentioned we have the part # ASR3500S04. Current pricing is available below at the product links.
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  • Does 4 inch Drop For Timbren Axle Less Systems Mean the Trailer will Sit Closer to Ground
    The Timbren Axle-Less Trailer Suspension System # ASR3500S04 has a 4 inch drop built into it so that it would sit 4 inches lower than a straight spindle setup like the part # TASR7KS01 that you referenced. The trailer will end up sitting 4 inches closer to the ground.
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  • Timbren Axle-Less Suspension System to Lower Trailer Deck Height
    There is a safe and effective way to lower your trailer height, Timbren 3500-lb Axle-Less Suspension Kits like # ASR3500S04. This bolt-on kit completely replaces your beam axle, leaf springs and hangers and it is designed with 4-inches of drop in the spindle height. You get lower deck height without compromising ground clearance and also a fully-independent suspension! Please check the linked video for more details on these Timbren suspension units. The easiest install method uses 2...
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Info for this part was:

Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Written by:
David L
Video Edited:
Jacob T
Video Edited:
Kathleen M
Updated by:
Laura H
Updated by:
Sarah W
Installed by:
Cole B
Installed by:
Randy B
Video by:
Zach D

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