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 w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs

Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs

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Our Price: $1,170.16
Trailer Leaf Spring Suspension
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Shipping Weight: 165 lbs
Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs 3500 lbs A35RD545E
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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 w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs part number A35RD545E can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (143)
  • Q & A (67)
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  • Why etrailer?

Timbren Trailer Leaf Spring Suspension

  • Axle Replacement System
  • Axles
  • Universal Fit
  • 3500 lbs
  • Timbren
  • 5 on 4-1/2 Inch Hub

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.


  • 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 with electric brake hubs and assemblies accept any 5-bolt wheels with regular tires
    • Electric brakes offer more control than hydraulic brakes
      • Requires an electric brake controller (sold separately)
    • 4" Drop provides lower ground clearance
    • EZ Lube feature makes it easy to grease bearings without removing the hub
    • Spindles can be removed from units for simple replacement if damaged
    • Bearings, races and seals are included with hub
  • 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


  • Fits: 1-axle and 2-axle trailers that use regular tires
    • Not recommended for triple-axle applications
  • Bolt pattern: 5 on 4-1/2"
  • Weight capacity: 3,500 lbs
  • Quantity: 2 suspension units with electric brake hubs
  • 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


  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 is simple to grease. If damaged, it can be removed and replaced, saving you both time and money.
  6. The electric brake hub (standard model hub shown) accepts any 5-bolt wheel that has a regular tire.
  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

Dimensions 1

Dimensions 2

Dimensions 3

Dimensions 4

A35RD545E Axleless Trailer Suspension System by Timbren - 4" Drop Spindle - Electric Brake Hubs - Regular Tires - 3500 lbs

ASR3500S04 Timbren Axle-Less 3500S, P019 Outboard Arm 4" Drop Spindle w/ Brake Flange

94545_LH 3500 lb Electric Brake Hub LH 545 1/2" Stud

94545_RH 3500 lb Electric Brake Hub LH 545 1/2" Stud

Item # A35RD545E

Customer Reviews

Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs - A35RD545E

Average Customer Rating:  4.6 out of 5 stars   (143 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.

- A35RD545E

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

- A35RD545E

I ordered Timbren axles from etrailer and was extremely satisfied. They were a. Couple bolts short but sent a whole package in a couple days .Quality of parts and customer service was extremely good!!! Thanks, Robert and Alexis 772290

- A35RD545E

Exactly what I was looking for. And the shipping was amazingly fast. Ordered on a Sunday I received it Wednesday!!! Tracking was easy your site is user friendly, easy to order and track orders. Best prices anywhere 584519


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

- ASR5200S01

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


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

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


- ASR5200S01

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

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


- A12WS545

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


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

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


- A20RS545

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

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. 289894

- A20RS545

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


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

- A12WS545

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

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


- ASR3500S06

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

- A35RS545

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

- A12WS545

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

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


- ASR3500S06

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

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


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

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

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


- A20RS545

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

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

This is my first time in building something like this 774926

- A20RS545

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

I wanted to give a lot star, but I spent three months because you missed parts of me a few times. Anyway it is very good for the product. 563720

- A20RS545

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

So far great! I used one of the Timbren Axles in a mountain trail camp/SAR trailer I just finished building. I have only had the trailer on roads because all the trails I want to try it on are still under snow...but it is melting fast. I have included a couple of photos. 612696


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

I think their axle-less design is very clever. The build quality of the suspension part looks good. I have heartburn over the spindle build quality. The spindle is mounted to the suspension and then the trailer wheel mounts on the spindle. The spindles I received are warped from welding. The plate that bolts onto the suspension does not mount flat due to this warping. I called Timbren. The gentleman that helped me was very pleasant. I described the problems and he said he would check his inventory and call me back. He did call me back and said they are all like that. He said get out the grinder and fix what you can and just tighten the bolts super tight, maybe the gap will go away. Really? Wow. The other problems are a LOT of weld spatter where the bolts are supposed to fit and they made a bend in the plate too close to the bolt holes so two bolt heads hit the bend and dont fit flat against the part they are supposed to hold together. Yikes! I am taking the spindles to a machine shop to fix them but I would not have ordered this Timbren stuff had I been warned before hand. So, fair warning. 100490

Your comments regarding the Axle-Less Suspension are greatly appreciated. To address the issues you have pointed out, we have carefully reviewed our assembly. While we did not come across any major issues, we did however discover a few areas where the quality could be improved, specifically in the areas you brought to our attention. The following improvements have been made to improve the manufacturing process: - Robotic welder gun re-programmed so that it stops from getting too close to the areas adjacent to the mounting holes of the outboard arm and control arm. This will minimize weld spatter. - The distortion of the flat plates is due to the high degree of heat generated during welding. We conducted experiments, changing the sequence of welding operations until we were successful in minimizing the distortion. We apologize if our customer service in addressing your concerns was insufficient at the time of your phone call. Timbren is an ISO 9001:2008 company with an excellent reputation for providing customers with quality products that are well-performing and easy to install.
-- comment by: Quality A - 09/26/2013


- A20RS545

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

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 517553

Show More Reviews

Ask the Experts about this Timbren Trailer Leaf Spring Suspension

  • How to Choose a Timbren Axle-Less Trailer Suspension System
    Yes, we do stock the Timbren Axle-less suspension systems such as # A35RD545E. What I would need to know first is if you want a system that comes with hubs or hubs and drums, or if you want one that just has spindles to reuse hubs or hub and drum assemblies. If you want one that has hubs and/or drums then I would need to know the bolt pattern of the wheels you have. I linked a help article to the right explaining how to measure for bolt pattern. If you want a system that is just spindles...
    view full answer...
  • Will Timbren Axle-Less System Allow Lower Deck Height on Trailer?
    There is a Timbren Axle-Less Suspension System which will allow you to lower your deck height, though it won't give you quite the amount you are looking for. The Timbren # A35RD545E has a 4 inch drop spindle so it will lower your deck height by that much. This system comes with electric brakes and hubs with a 5 on 4-1/2 bolt pattern. You would be able to use a wheel and tire combination such as the Taskmaster # AC14R45SM which have 14 inch wheels and a total diameter of 26.1 inches. I've...
    view full answer...
  • Can Timbren Axle-Less Systems be Used In Tandem for a Tandem Axle Trailer
    Yes, you can use Timbren Axle-Less Systems like the part # A35RD545E that you referenced for a tandem axle setup. You cannot use this setup for a triple axle though.
    view full answer...
  • 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...
    view full answer...
  • Mounting Dimensions of the 3,500 lb Timbren Axle-Less Suspension System # A35RD545E
    I have attached a top view photo with additional dimensions that should be helpful. As you may already know, this system will have 1-3/4 inches of deflection under a full load. If you are using fenders, I recommend placing the fenders 3 inches above the tires at full deflection for maximum bump clearance.
    view full answer...
  • Recommendation To Replace Straight Axles On Trailer For Lower Ground Clearance
    Since your straight axles are too tall for your application, you can use shorter hangers for your current axles and springs. If that won't get you the clearance you need, I recommend replacing your axle with the Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs # A35RD545E. This will give you the suspension, brakes, and lower your trailer. If you need a larger capacity let me know. This system has EZ lube spindles and the 4 inch drop provides...
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  • Availability of CAD Diagram for Timbren Axle-Less Trailer Suspension System # A35RD545E
    We do have engineering diagrams for the Timbren Axle-Less Trailer Suspension System # A35RD545E that you referenced, and we do show these on our product page. If you scroll down a bit you'll find several measured drawings of this system with dimensions and mounting points. I have also linked one of these images for your review. This kit installs either by welding or bolting to your trailer frame and two sets can be used for a tandem-type application (but not three). Included are built-in...
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  • Recommended Axle-Less Trailer Suspension With Drop Spindle For Older Coachman Camper
    We have axle-less systems that are designed with a drop spindle but we do not offer a standard axle with a drop as you said you have on your trailer. We Have axle-less systems like part # A35RD545E that has electric brake hubs and has a 4-inch drop spindle. The bearings, races, and seals are included and the wheel bolt pattern is 5 on 4-1/2. For an axle-less system with idler hubs and a 4-inch drop spindle I recommend part # A35RD545. Both of these systems have a 3,500-lb weight...
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  • Timbren Axle-Less 3500-lb Suspension System for Off-Road Teardrop Trailer
    We offer two Timbren axle-less systems rated for 3500-lbs, part # A35RD545E which has spindles with a 4-inch drop, and part # A35RS545E which would be better for your application since it will not reduce your ground clearance. For off-road use you do not want to use a kit that has drop spindles; this type is better for a ramped trailer where you want a low deck height. Kit # A35RS545E includes the frame-mount suspension assemblies, E-Z Lube spindles with 4- bolt brake flanges, hub/drums,...
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  • Replacement Travel Trailer Axle For Square Drop Axle
    Thanks for the picture. The square axle you have also has a drop to it. Based on spring to spring measurement and the drop needed, we only have one good option for your axle, but it will include the electric brakes and the suspension you need so the leaf springs will be replaced with another option. For your application, I recommend either the Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs # A35RD545E or the straight spindle # A35RS545E...
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  • Timbren Axle-Less Suspension System for More Ground Clearance on a 2015 [email protected] Trailer
    The Timbren Axle-less systems are ideal for situations like yours where ground clearance is important and customers have had a lot of success using them for this purpose. Regarding the type of system though you would want to look at ones that have a lift spindle. The lift means the trailer will be higher up. Ones with a drop spindle will lower the height of the trailer. For a 3,500 pound model with a 4 inch lift # ASR3500S06. This model does not come with the hub and drum assemblies...
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  • Troubleshooting Squealing Trailer Brakes
    You could have drum brakes or disc brakes on your 2008 Forest River Wildcat trailer. Which if you have disc brakes it could be that you need to put the brake pad lube on the pads. I wish we carried this but we do not. Auto parts stores should have this. For drum brakes typically squealing is caused by dust in the drums. The solution would be to remove the drum and clean the assemblies. Cheap brake linings can cause this problem as well.
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  • Availability of Timbren Axle-Less Suspension System With Hydraulic Brakes with 4000-lb Capacity
    Both of the Timbren Axle-Less suspension systems with brakes that we offer have a 3500-lb capacity and both also feature electric brakes, not hydraulic brakes. Part # A35RD545E is a kit with 4-inch drop spindles and part # A35RS545E has straight spindles. Neither of these would have the capacity you need for your trailer. We do offer a Timbren system rated for 5200-lbs, part # ASR5200S01, which includes 5-bolt brake flanges. With these you could use hydraulic brake assemblies # 23-325...
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  • What To Do With A Bent Torsion Axle
    This would all depend on where the bend is located. If the torsion bar that connects the frame brackets together is bent, then you would need to buy a new axle. However, if the spindle on the torsion axle is bent, you can replace it. To prevent other malfunctions, I recommend using one of our Timbren Axle-Less System systems as they work independently of one another in addition to being an easy replacement option for most torsion axles. I have attached a list of all our Timbren systems...
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  • Wheel and Tire Recommendation for a Timbren Axle Less System A35RD545E
    Since the hub drum that comes with the part # A35RD545E that you referenced is designed for 10 inch brake assemblies a 10 inch wheel would not fit it. Instead you would have to go with a 13 inch diameter rim/tire like the part # AM31985. This would be the smallest diameter wheel/tire we could recommend at 24.1 inches.
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  • Weight Capacity of the Timbren Axle-Less Trailer Suspension System # A35RD545E
    Each of the two hub/suspension assemblies in the Timbren Axle-Less Trailer Suspension System # A35RD545E is rated for 1750-lbs, so together they offer capacity equal to a standard 3500-lb axle. This system can be used to configure a tandem-type trailer if two sets are used. It is not recommended to use three sets to mimic a triple axle suspension. Timbren also offers two higher-rated 5200-lb-capacity systems, part # ASR5200S01 and part # ASR5200S04 with 4-inch drop spindles and brake...
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  • Tire Clearance on Fabricated Trailer Using Timbren Axle-Less Trailer Suspension # A35RD545E
    The overall diameter of a 15-inch tire will range from 27.1-inches for a 205/75-15 size to 28.4-inches for a 225/75-15 size. The linked article offers a table with tire dimensions. The standard deflection of the Timbren 3500-lb system # A35RD545E with a static load (sitting still in the driveway) is 2-5/8-inches according to my contact at Timbren. It was suggested that to this you add several more inches of clearance to allow for the effects of bumps. You will need to use the overall...
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  • Distance from the Spindle to Trailer Frame when Installing a Timbren Axle-Less System a # A35RD545E
    For the Timbren Axle-Less Trailer Suspension System Drop Axle # A35RD545E the distance from the center of the spindle to the bottom of the trailer frame will be right at 4 inches. The Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs Straight Axle # A35RS545E would be 1/4 of an inch.
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  • What Bearings Come with the Timbren Axle-Less A35RD545E and What Wheels would Fit
    The Timbren Axle-Less Trailer Suspension System # A35RD545E that you referenced uses inner bearing # L68149 and outer bearing part # L44649. It sounds like you are asking about the outer bearing. The wheel will need to be at least 13 inches in diameter and will need to have the same bolt pattern of 5 on 4-1/2 inches like the part # AM31985.
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  • Axle Recommendation for Building Low Profile Utility Trailer
    Having a deck height for a trailer of 13-14 inches is pretty low. Using the 4 inch drop Timbren setup part # A35RD545E would give you the best chance of it getting that low. The center of the spindle will end up being 1/4 of an inch below the trailer frame when installed. So depending on the size tires you use and the other dimension of the trailer it would be technically possible. I attached a dimensional drawing for the setup for you to check out as well.
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  • Can Timbren Axle-Less Suspension be Added to a Trailer with a Straight Axle
    You can add a Timbren axle-less suspension system to your trailer but you have to choose one carefully so that the tires hang at the same height as the regular axle. You will also need one that has the same capacity as the axle now so that there is little to no difference is the suspension. You can put the system forward or rearward of the existing axle but it will depend on where the additional weight is going to be and how long the trailer is. I have included a picture with a formula...
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  • Weight Capacity for Timbren Axle-Less Trailer Suspension System # A35RD545E on Tandem Axle Trailer
    Each of the two hub/suspension assemblies in the Timbren Axle-Less Trailer Suspension System # A35RD545E is rated for 1750 lbs so together they offer the 3,500 lb weight capacity. When using two systems for a tandem/double axle application, you will have a total weight capacity of 7,000 lbs.
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  • How to Measure to Determine Wheel Bolt Pattern
    You can refer to the linked article for illustration of how to measure a hub's bolt pattern. If there is an ODD number of lugs, as with a 5-on-4-1/2-inch wheel, measure from the center of one lug to a point halfway between the two lugs directly opposite on the bolt circle, as shown in the linked photo. The Timbren axle-less suspension kit you referenced, part # A35RD545E, includes hubs with the 5-on-4-1/2 bolt pattern.
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  • Which Spindle Height of Timbren Axle-Less Trailer Suspension for Car Trailer
    The drop spindle model you mentioned, part # A35RD545E would be used over the straight spindle model, part # A35RS545E if you wanted a lower deck height on your car trailer. Since you are most likely already using ramps, I cannot see how you would benefit from further lowering the trailer deck height. The straight spindle model would place your spindle center about 4 inches below the mounting surface of the unloaded trailer. The drop spindle model would place the spindle center about 1/4...
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  • Do the Electric Brakes Come with Timbren 3.5K Axle-Less Trailer Suspension System # A35RD545E
    Yes, the Timbren Axle-Less Trailer Suspension System # A35RD545E does include the actual brake assemblies as well as the hub and drum assemblies. The Timbren systems are great if you're looking for a better, independent suspension for the trailer or more ground clearance beneath the trailer.
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  • Timbren Axle-Less Suspension for a Deck Over Enclosed Trailer
    As long as there is the proper space on the trailer frame, you can install a Timbren Axle-Less suspension system such as # A35RD545E. I have included a picture that shows the relevant mounting dimensions and bolt pattern so you can determine if it is going to work with your trailer design.
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  • Suspension Travel of Timbren Axle-Less Suspension # A35RD545E
    You'd need to use a minimum of a 14 inch wheel with the # A35RD545E Timbren Axle-Less Trailer Suspension System. The brake drums recess into the wheel to a degree, and the drums wouldn't fit with a wheel smaller than 14 inches. There are brake drums that are smaller in diameter, but they wouldn't be compatible with the spindles used on any of the Timbren axle/suspension options. According to Timbren, the rubber spring allows for 1-3/4 inches of deflection. You'll want to position the...
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  • How Far Does the Suspension Travel on the Timbren A35RD545E
    The deflection (or amount the suspension can travel), for the Timbren part # A35RD545E that you referenced is 1-3/4 inches. I attached a picture that shows this dimension as well.
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  • Hub Face Measurement for Tire Clearance on 3,500 Pound Timbren Axle-Less Trailer Suspension System
    The Timbren systems that include brakes do not have parking brakes. The electric drum brakes included are Axletek. The 6 inch measurement from the hub face to the hangers of the system is accurate for the # A35RD545E system you're looking at.
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  • 3,500 lb Axle With 5 on 4-1/2 inch Bolt Pattern Hubs and 4 inch Drop Spindles
    Yes we do. It's not a standard axle but it fits all of the criteria you are looking for. Check out the Timbren Axle-Less Trailer Suspension System with Electric Brake Hubs # A35RD545E. This has a 3,500 lb capacity, has brake hubs that have 5 on 4-1/2 inch bolt pattern and has drop spindles that give it 4 inches of drop.
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Info for this part was:

Expert Research:
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Jeffrey L
Video Edited:
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Installed by:
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Updated by:
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