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  1. Trailer Axles
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  5. 5 on 4-1/2
  6. Rubber Spring Suspension
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

Item # A35RD545E
Our Price: $1,107.37
Trailer Axles
This item qualifies for Free Shipping
Shipping Weight: 120 lbs
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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. Great Prices for the best trailer axles 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 or call 1-800-940-8924 for expert service.
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Timbren Trailer Axles - A35RD545E

  • 3500 lbs
  • Universal Fit
  • 5 on 4-1/2
  • Rubber Spring Suspension
  • Electric Brakes
  • Drop - 4 Inch
  • Timbren
  • Easy Lube Spindles

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 self-adjusting 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

Customer Satisfaction Score:

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   (246 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.


Ed was great to work with and very knowledgeable with the products we needed.


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


The suspension looks very high quality. I was kept informed where the parts were from the time I ordered until They showed up at my door.


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


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




Review from a similar Axle-Less Suspension in Trailer Axles

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

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


Review from a similar Axle-Less Suspension in Trailer Axles

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

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

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

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


Review from a similar Axle-Less Suspension in Trailer Axles

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

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


Review from a similar Axle-Less Suspension in Trailer Axles

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


Review from a similar Axle-Less Suspension in Trailer Axles

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


Review from a similar Axle-Less Suspension in Trailer Axles

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


Review from a similar Axle-Less Suspension in Trailer Axles

Very easy to install, rides and tracks really good! I highly recommend these axles


Review from a similar Axle-Less Suspension in Trailer Axles

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


Review from a similar Axle-Less Suspension in Trailer Axles

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

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


Review from a similar Axle-Less Suspension in Trailer Axles

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


Review from a similar Axle-Less Suspension in Trailer Axles

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

Really cool work!
-- Etrailer Expert Sierra K - 07/07/2021


Review from a similar Axle-Less Suspension in Trailer Axles

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

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

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

Ordered 5 wheels w/tires, very nice.

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

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

I 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


Review from a similar Axle-Less Suspension in Trailer Axles

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

After a year of off road use, I couldnt be happier. My trailer rides smooth loaded or unloaded. No of that bunny hopp with leaf springs or rigid mount axles. The small rebound control snubber works perfectly! I modified my components for high clearance but the concept is sound, they work well. Great job Timbren!
Doug F - 06/22/2017


Review from a similar Axle-Less Suspension in Trailer Axles

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

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


Review from a similar Axle-Less Suspension in Trailer Axles

It is important to know that your wheels are going to sit very tight to the trailer frame. I needed to add an extension to the hub for it to clear the sides of the camper I built.


Review from a similar Axle-Less Suspension in Trailer Axles

It was a very straight forward install, it goes pretty smooth if you take your time, double check your layout,

Make sure of your bolt sizes (length) before going to the store. If you plan the project, don’t rush, its not a race, it goes really good. I spent about 10 hours spread over two days by myself. I am just waiting for tires to arrive.

All that said very happy with the product and etrailer. Will recommend for any axel/suspension replacement.

Things have worked out well, can hardly tell there is a trailer behind the ATV very smooth ride almost no noise, vert satisfied.
K v - 08/29/2022


Review from a similar Axle-Less Suspension in Trailer Axles

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


Review from a similar Axle-Less Suspension in Trailer Axles

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.

Show More Reviews

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    Best solution we have is the Timbren Axle Less system with 4 inch drop part # A35RD545E which has a 3,500 lb capacity and would work well. This isn't a standard style axle as it attaches directly to the frame and does not have a cross tube, but it will work great and give you the drop you need. It also comes with hub/drums as well. I attached a review video for this for you to check out as well.
    view full answer...
  • 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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  • 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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  • 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 axle...
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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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  • 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.
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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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  • Available Timbren Axle-Less Brake System With 3500-lb Capacity For Trailer
    We do not offer torsion axles, but we do have axle-less Timbren axles that have built-n suspension. The great thing about these systems is they can be used on any width trailer since they bolt right to the trailer frame. I have attached a link to the axle-less systems we offer that you can check out. Some of the systems have a drop spindle like part # A35RD545E. These are great for trailers with a lower deck height. This system has electric brake hubs already included.
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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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  • 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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  • Do You Need To Make Adjustments For Camber After You Install Timbren Axleless Trailer Suspensions
    You do not need to make any extra adjustments after the Timbren Axle-Less Trailer Suspension System w Electric Brake Hubs - 4" Drop Spindle - 3,500 lbs # A35RD545E have been installed. However if the frame on your trailer itself is warped or in some way out of alignments or square you would need to make some adjustments.
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