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  1. Trailer Axles
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  4. Universal Fit
  5. Spindles Only
  6. Lift - 4 Inch
Timbren Axle-Less Trailer Suspension - Heavy Duty - Long Spindle - 4" Lift - 5 Bolt - 3.5K
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Timbren

Timbren Axle-Less Trailer Suspension - Heavy Duty - Long Spindle - 4" Lift - 5 Bolt - 3.5K

Part Number: ASR35HDS02
$1,305.78
Trailer Axles
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etrailer Installation
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Designed for use with wide, off-road tires, this setup gives you more clearance and a smooth ride. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, long, standard-height spindle maintains deck height. Fits any trailer frame width. Great Prices for the best trailer axles from Timbren. Timbren Axle-Less Trailer Suspension - Heavy Duty - Long Spindle - 4" Lift - 5 Bolt - 3.5K part number ASR35HDS02 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Timbren Trailer Axles - ASR35HDS02

Highlights

  • 4" Built-In Lift: Raises the trailer for better ground clearance on rough roads.
  • 3,500-lb Capacity: Strong enough to handle heavy cargo or off-road gear.
  • Independent Suspension Arms: Each side moves separately for better handling and control.
  • AEON Rubber Springs: Absorb shock and cut down bounce, sway, and noise.
  • No Axle Beam Design: Increases clearance under the trailer and fits any frame width.
  • E-Z Lube Long Spindles: Accept wide off-road tires and make bearing service simple.

Features to know about

More Clearance on Rough Roads: 4" Lift Axle-Less Suspension Handles Off-Road Terrain

When the road turns to ruts or steep driveways, more ground clearance makes all the difference. This Timbren Axle-Less Trailer Suspension adds a 4" lift and eliminates the axle beam, so nothing hangs down to catch on rocks or curbs. The long spindles give extra room for wide off-road tires, and the built-in camber and toe-in geometry help your tires wear evenly no matter how rough the ground gets.

Smooth, Quiet Ride on Any Load: Dual Rubber Springs Soak Up Shock

Rattle, bounce, and harsh hits fade away with Timbren’s AEON rubber jounce and rebound springs. They cushion impacts, control body roll, and keep your cargo steady whether the trailer is empty or fully loaded. Each side works independently, so bumps under one wheel don’t shake the entire trailer. The result is a smoother, quieter tow on pavement or dirt.

Built to Take a Beating: Heavy-Gauge Steel with Powder-Coat Finish

Hauling heavy gear or heading off pavement demands hardware that can take abuse. Each suspension unit is built from robust, heavy-gauge steel and coated in a black powder finish that resists rust and corrosion. The design gives you 3-3/8" of suspension travel and a 3,500-lb weight capacity, so it’s ready for demanding use without flex or fatigue.

Easy Maintenance and Custom Fit: Works with Any Frame Width

This axle-less setup bolts directly to your trailer frame, fitting any width without the need for a custom axle. The E-Z Lube spindles make bearing service simple with built-in grease zerks, and the 5-bolt brake flange matches common electric brake assemblies. If your frame doesn’t have a crossmember, you can add a 2" x 2" steel tube through the built-in square holes for extra support. It’s a clean, strong way to modernize your suspension and keep your trailer tracking straight.

Image showing crossmember installation between Timbren Axle-Less suspension units on a trailer frame

Example showing 2x2 steel tubing installation through Timbren Axle-Less suspension frame holes for added support

Illustration showing reinforcement bracket installation for Timbren Axle-Less suspension inside trailer frame

Specs

Application

  • Application: single- and tandem-axle trailers that use wide, off-road tires
  • Tandem-axle trailers: require 2 complete systems
  • Not recommended for: triple-axle trailers

Quantity

  • Quantity: 2 suspension units (without hubs)

Weight and Capacity

  • Weight capacity: 3,500 lbs

Brake and Mounting Information

  • Brake flange configuration: 5 bolt
  • Bolt hole diameter: 1/2"

Suspension Travel

  • Suspension travel: 3-3/8"

Warranty

  • Warranty: 3-Year limited warranty

Tire, Wheel, and Hub Compatibility

  • Tire size: 35 x 12.5 x 20 or larger
  • Wheel diameter: 20" or larger
  • Wheel offset assumption: zero offset
  • Bearings (sold separately): Inner: 25580, Outer: 14125A
  • Races (sold separately): Inner: 25520, Outer: 14276
  • Seal (sold separately): 10-36
  • Seal inner diameter: 2.25"
  • Seal outer diameter: 3.376"

Dimensions

  • A: 14-9/16"
  • B: 16-3/8"
  • C: 1-1/2"
  • D: 6-1/4"
  • E: 7-5/16"
  • F: 5"
  • Front view dimensional diagram of Timbren Axle-Less suspension showing labeled measurements A through F
  • G: 5-5/8"
  • H: 8"
  • I: 5-3/4"
  • 2-1/4"
  • K: 3-1/4"
  • L: 5-1/4"
  • Top view dimensional diagram of Timbren Axle-Less suspension with measurements labeled G through L

Note

  • This Axle-Less system requires crossbeam support. If your trailer frame doesn't have a crossmember in place, you can retrofit it with one, or you can add a support by running a piece of 2" x 2" steel tubing through the square holes cut into these units. You could also add a steel reinforcement bracket to the inside of the trailer frame.

ASR35HDS02 Axleless Trailer Suspension System by Timbren for Off-Road Tires - 4" Lift Long Spindle - Without Hubs - 3,500 lbs HD

Installation Details ASR35HDS02 Installation instructionsAlternate Instructions ASR35HDS02 Installation instructions



Ratings & Reviews

4.6

166 reviews
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Designed for use with wide, off-road tires, this setup gives you more clearance and a smooth ride. Built-in shock absorption limits rattle and bottoming out. E-Z Lube, long, standard-height spindle maintains deck height. Fits any trailer frame width.

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Timbrens work great! They make my homebuilt camper tow smooth, straight, and no bounce. Off road they give me better control and don’t make my light camper jump around on the trail. Install was straight forward, instructions were adequate and overall went pretty well. Staff at etrailer helped me pick the right bearings and provided great customer service as usual. I would recommend these to anyone looking to improve their trailers handling and towing characteristics.



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So we had a torsion axle / frame failure and these and a new subframe was our solution! Amazing product upgrade with 12" brakes and 7000lb HD Running 16" BFG ko2 tires ! These are truly bolt on if you don't have frame problems also if your running single axles on the west coast and mountains the 12" brakes are a huge upgrade!!!



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Arrived in time and no issues



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Great service. So far so good. Highly r ecommend



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Great product!



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Looks very heavy duty, should work really great with with the trailer I'm building



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Massively overbuilt and highest quality !! Note that these are HD versions which have 6000lb spindles and use 6000lb bearings, seals and brakes.



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Great communication and fast shipping, much appreciated will always do business at etrailer !!



by:

Great heavy duty option for those looking to have a quiet, off-road ride. Works with most applications and requires little to no preparation. I used these on multiple trailers over the years and will continue to.



by:

I live in California and I'm building a custom off-road camping trailer for overlanding/camping, mainly for the Sierra Nevada backroads, but possibly for longer trips in a variety of terrain. I had read about the axle-less suspension from Timbren and found that it's a popular choice for these types of trailers. In my searches, etrailer.com came up frequently. So I posted a few questions on their web site, and got a prompt response with tons of great information and a complete parts list for what I needed. Much appreciated! The order handling and shipping was very prompt, and all my parts were shipped in one shipment which I definitely appreciate since I don't get packages delivered to my door. I received all the packages today. Great customer support, prompt handling, and quality products. I gave 4/5 stars because the packaging could have been a little better. One of the boxes was a little banged up in the corners, but the content was unharmed as far as I can tell. I've also received follow-up emails to ensure that I received everything and that it was in good shape. Overall, I'd highly recommend the company, and I won't hesitate to buy from etrailer again! My trailer build will probably take a few months to complete with all the bells and whistles, but I'll be sure to post pictures from the process.



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Be warned! I would not buy from Etrailer ever again. We received our order and Etrailer failed to send the entire trailer axle kit. They did not include one spindle in the kit, rendering our order useless without ordering an additional spindle. Because more than 30 days had elapsed before reporting the issue, Etrailer refused to send the spindle, in addition to insinuating that I was deceiving them. This must be how they increase their revenues…don’t send the entire order, and if the customer does not catch it within 30 days, the customer loses and Etrailer makes more money. Absolutely horrible customer service from the company who failed to fulfill their end of the contract while accusing me of being deceptive. One star is far too generous for Etrailer and their scams.



by:

Very pleased with the design and heavy duty construction of these axles. Used them to build an off-road trailer and they performed flawlessly throughout many challenging trails and off road situations. My only complaint is that the ez-lube hub design does not take grease very easily. I've had to disassemble the hubs to properly grease both bearings due to the inadequate amount of grease flowing into the bearings.


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