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  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Front
  5. Steel w Polyurethane Bushing
  6. 1-3/4 Inch Diameter
Roadmaster Front Anti-Sway Bar

Roadmaster Front Anti-Sway Bar

Item # RM-1139-148
Our Price: $565.60
You Save: $205.84
Anti-Sway Bars

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Shipping Weight: 59 lbs
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Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the front axle and to the frame to balance weight transfer and reduce body roll. 1-636-306-4830 to order Roadmaster anti-sway bars part number RM-1139-148 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Front Anti-Sway Bar. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1139-148

  • Anti-Sway Bar
  • Roadmaster
  • Front
  • Steel w Polyurethane Bushing
  • 1-3/4 Inch Diameter

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the front axle and to the frame to balance weight transfer and reduce body roll.


  • Minimizes side-to-side movement to improve overall stability of your vehicle
    • Lets you execute turns and quick maneuvers with confidence
    • Allows for a level ride, even on irregular surfaces
    • Reduces driver fatigue - minimizes effort required to keep your vehicle in line
  • Diminishes effects of crosswinds, passing motorists, and shifting cargo
  • Designed to fit your vehicle and work in conjunction with its suspension system
    • Attaches to front axle and to chassis - uses weight of axle to brace frame as it shifts in turns
    • Engineered to avoid interference with most popular aftermarket add-ons and accessories
  • Made with polyurethane bushings instead of the standard rubber variety for a longer-lasting system
    • Polyurethane is durable and resistant to damage caused by oil, gasoline, and ozone
    • Less wear means less give in the system and better support
  • Constructed of thick 4140 chromoly steel for superior strength
  • Includes heavy-gauge mounting hardware, easy-to-follow instructions and bushing lubricant
  • Works with rear anti-sway bar (sold separately) for absolute stability - available on certain applications only
  • Made in the USA


  • Bar diameter: 1-3/4"
  • Limited Lifetime Warranty

Roadmaster Anti-Sway Bar Installed

Benefits of an Anti-Sway System

The Roadmaster anti-sway bar does for side-to-side movement what a good pair of shocks does for up-and-down motion. You will notice a marked improvement in your vehicle's stability as the bar works to balance weight transfer and reduce body roll. The anti-sway bar acts as a link between your vehicle's frame and its rear axle, using the axle as a brace to more effectively balance the shifting weight of your vehicle as you maneuver it. Lubricated bushings allow just enough pivot and rotation to compensate for the pressure placed on one side of your vehicle when it goes into sudden maneuvers, hits crosswinds or encounters shifting weights.

Roadmaster Anti-Sway Polyurethane Bushings

Superior Construction

The Roadmaster anti-sway bar is made of 4140 chromoly, a chromium and molybdenum steel alloy. This type of steel is considerably harder and stronger than the standard 1020 steel that is typically used in anti-sway applications. In addition, the larger diameter of the bar increases its torsional roll stiffness. The result is a bar that is not only stronger than the competition, but also nearly 30 percent better at resisting sway. The polyurethane bushings and grommets used at the attachment points are durable yet flexible, ensuring that the system is neither so rigid nor so malleable that it becomes ineffective.

1139-148 Road Master Anti-Sway Bar - Front

Replaces Roadmaster 1139-140 and 1139-206

Installation Details RM-1139-148 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Front Anti-Sway Bar - RM-1139-148

Average Customer Rating:  4.8 out of 5 stars   (1344 Customer Reviews)

Minimize sway and driver fatigue by improving the stability and driveability of your vehicle. The bar on this sturdy, effective anti-sway system mounts to the front axle and to the frame to balance weight transfer and reduce body roll.


Definitely a big difference in the drive! I was expecting longer bolts that hold the sway bar.


We recently installed the Roadmaster Sway Bars along with Sumo springs from trailer on our 2017 Winnebago Vista 31T which utilizes the Ford F53 chassis. What a game changer in the overall ride and handling. Customer service was excellent and I highly recommend the company for their high quality product.


Ford builds a crappy chassis for motor homes. If you have a Ford chassis, this sway bar makes the ride so much better. Well, built and easy installation. I’m not a mechanic, but with the directions and a you tube video it was a snap.


I'll be installing this sway bar tomorrow.
arrived in great shape via UPS.
The speed of shipping and receipt of the shipment was quick and highly appreciated.
I may be interested in Sumo Springs (SSF 172-40-2) in the future as well.

Holiday Rambler

Did both front and rear on my 99 holiday rambler 38 ft vacationer . Drove from Salem to Missoula and it was like driving a new rig . Don’t know how I drove without them


Customer service is amazing! Parts arrived quickly and everything is perfect. Very easy to order from.


No instructions in box, missing washers

Thank you for reaching out. I will have our customer service team reach out to you.
-- Etrailer Expert Brooke M - 08/31/2022


Easy install on motor home, major handling improvement.


It was a scary ride prior to the install, now a 100% less sway. Just wish there was a sway bar upgrade for the rear of the Thor Outlaw.

You mentioned that you would be interested in a rear sway bar for your 2019 Thor Outlaw. I checked and we might have one available. I would need to ask you a few questions. Does your Outlaw have a V8 or V10 engine? Does it have automatic chains?
-- Etrailer Expert Jenny N - 04/25/2022


again my parts came so fast and ahead of time ETrailer is the best place to get your stuff and their 100% Pros and easy to talk to and deal with.... !!


Got delivery in a timely manner. All items were as advertised and installation hardware was complete.
The Sumo Springs and heavy duty sway bars made a SIGNIFICANT difference in the ride and handling.
Would have no problem ordering from this company again. They were also very helpful and patient on the phone.


Really helped to reduce the RV rocking, especially when turning at low speed over bumps.


received and installed the new Roadmaster part.

Bit extra effort solo, but completed in couple hours


The sway bars improved the steering on the motorhome and provided a very stable ride with no sway.


A very noticeable improvement in handli ng.


Best upgrade for a class A motorhome!

2019 Thor Hurricane Motorhome

The sway bar looks great I put some photos on when I get it on


Fast shipping on a part that was going to take 10 weeks to ship, but was delivered to my house in less than 2 weeks.


Fit great and flattened out the ride


Great fit with no modification necessary
Have not driven it since install. Will update on performance wise


Excellent service!! Very helpful!


Everything looks good


Very happy with all the suspension parts I have received from them fast shipping . I will be ordering more from them in the future .


We took our first trip with these installed over the last two months (April & May 2021 4,000 miles). All three of these were put on at the same time front & rear anti sway bars with the extended length U-bolts. The RV handled great.


These were a pretty simple install and work as advertised. I installed them by myself but could have used another set of hands due to the weight of the bar.

I recommend them.

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