bing tracking image
  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. 1-1/2 Inch Diameter
  6. Steel w Polyurethane Bushing
Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter

Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter

Item # RM25FR
Our Price: $767.48
Anti-Sway Bars

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 61 lbs
Add to cart
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos


Need help with installation?
Locate installers near me
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 rear axle and to the frame to balance weight transfer and reduce body roll. 1-800-940-8924 to order Roadmaster anti-sway bars part number RM25FR or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter. Anti-Sway Bars reviews from real customers.
  • All Info
  • Reviews (17)
  • Q & A (0)
  • Photos

Roadmaster Anti-Sway Bars - RM25FR

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • 1-1/2 Inch Diameter
  • Steel w Polyurethane Bushing

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 rear 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 rear 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 front anti-sway bar (sold separately) for absolute stability - available on certain applications only
  • Made in the USA


  • Bar diameter: 1-1/2"
  • 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.

1109-101 Road Master Anti-Sway Bar - Rear

Installation Details RM25FR Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Rear Anti-Sway Bar - 1-1/2" Diameter - RM25FR

Average Customer Rating:  4.5 out of 5 stars   (17 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 rear axle and to the frame to balance weight transfer and reduce body roll.


Installation was pretty easy. Would be nice if the plate with the nut you have to fish down the frame was just a flat plate with a threaded hole - hard to get it down there with the nut on top. If the holes on the shock mount have a welded nut, you have to drill it out, which was easy but then the bolts are 1/4" short to get all they way into the nylock nut so I had to go buy 4 more 7/16 grade 8 bolts that were 1/2" longer. Initial test ride unloaded and not much noticed in ride quality. Actually seems smoother. I bought this for when I load 3000+ lb truck camper to help with side/side sway. Will update this when I test it.
Installed on 2023 GMC Sierra 3500HD. Almost 1/2 price of Hellwig and 1/4" bigger diameter and it is also chromoly. Maybe a little harder to install because of the plate you have to fish down the frame (especially the drivers side because the rear tank strap has to be unbolted and tank supported with a jack stand then jacked back up to be re-bolted - add an hour for install) and only one hole instead of 3 on the end so no adjustment. Not sure if that adjustment makes much difference.

2022 GMC Sierra 2500

Decent product, fast shipping if the product is in stock but very poor execution.

If you buy this you'll need to plan on a couple trips to the hardware store. As several other reviews from the past couple years state, there are no grade 8 5/8" 2" bolts included in the kit. I thought that since the issue had been called out in other reviews, the problem would have been fixed by now which made me even more frustrated when I received the incomplete kit. I've got a 2022 GMC Sierra 2500 and I had to drill out the shock mounts, this made the 7/16" bolts too short so add those to your list if you have a similar truck.

Additionally the directions appear to be good at first glance but have some big gaps when you're actually trying to do the install. This is the only kit I've gotten from etrailer I've had issues with missing parts and poor directions.

Etrailer's picture of the product is incorrect as the frame mounts actually included with this kit are much less substantial than shown. It is only the u shaped piece with one bolt through them keeping the front end of the sway bar up. Furthermore that bolt is attached to a nut that is welded in a plate (welding a nut reduces its strength) so the whole front end is attached to two compromised nuts. I would not have purchased the kit if I had known that to start with, I thought I was getting what was in the picture for this product.

Lastly if you also have the superspring suspension kit it makes it very hard to get the shock mounts bolted to the frame bracket. I ended up having to remove that and reinstall it after the sway bar was in place.

I reached out to customer support before writing this review and the issue was not solved.


This made a huge difference in towing my truck camper. It was easy to install even though I had to install and remove and reinstall it. I did not drop the tank instead fished the hardware through a hole on the outside of the frame. the only thing I do not like is how low this hangs. any ground clearance is lost. noticeable on fire roads or logging roads.

2022 GMC Sierra 3500

I just installed it yesterday. I lost the nut welded to the piece of wire in the frame on the right side and spen the next 45 minutes trying to retrieve it or get it flipped over the right way. On the left side I tied a long leader on the end just in case. Of course that part was fine. But I supported the gas tank under the strap and had to move to get the strap back in place. After drilling out the bolt holes in the shock mounts I had to figure out of the bolts went from the bottom like the diagram or from the top like the picture. I haven't driven yet but im sure it will be great.


Very good results, helps a lot with side to side sway. Instructions said to remove shocks to install but I was able to work around that. Front supports seem to be a bit lower than I expected but so far no consequences.

2021 GMC Sierra 3500

Very excited and happy to have purchased this sway bar for my 2021 GMC Sierra 3500HD. The quality is superb with it's thick heavy bars. Came with everything needed to install this behemoth!
There was one hiccup while installing, at no fault to etrailer. The holes to fit the screws into my truck next to my shock absorbers had nuts welded on the top of the holes?! The screws were to big to fit through because of these nuts. Only way to get around it was using a reamer bit to make the hole even all the way through. From there it was easy. The instructions even indicated that there could be some manufacturing alterations from the original specs that may effect install. Highly recommend!!


Only thing that kept the product from 5 stars is that it was missing the 2- 2” x 5/8” grade 8 bolts.

2024 Chevrolet Silverado 3500

Easy step by step instructions.


Have a 5th wheel trailer and bought a slide in pickup camper. When I was looking for the camper,alot of sights recommended installing a rear sway bar. So I did. When I picked up the camper had a 360 degree on ramp that I knew would be the test,at 30 mph truck did not lean at all. Very impressed! Good product. Noticed less lean with 5th wheel when backing on an angle.

2021 Chevrolet Silverado 3500

Super rugged bar, relatively simple installation, but the instructions could stand to be a little better. A few more pictures would go a long way towards making it easier to understand.



Great! Hualing a truck camper around for the last 8 months or so and the sway bar makes that a much nicer operation.

2021 Chevrolet Silverado 2500

Was easy to install and worjz awsome made a big difference in the truck should make a big difference with towing 5 th wheel. But will have wait until spring for that


I have always loved etrailer but this last order was not up to their standards. Directions were not the best for my 2021 GMC 2500HD and wrong parts. The 6 bolts for mounting the main brackets were 3.5" and 4.5" is what is needed and no nuts for them. The directions left out that you had to drop the gas tank to attach the drivers side bracket also and link arm bolts are not the same size. It has cost me $xx in nuts & Bolts so far.

Etrailer Expert

Sierra K.


I am sorry that you are having such trouble with this product. It sounds like something is not correct in the order. Customer Service will be reaching out to you.


I put this unit on a 2020 GMC Denali. It fit perfect. Only took an hour to install. I carry a 12 foot overhead Lance camper and this bar took almost all of the top sway out when coming out of a parking lot or when big rigs pass.

2022 GMC Sierra 3500





See what our Experts say about this Roadmaster Anti-Sway Bars

Do you have a question about this Anti-Sway Bar?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Mike S
Written by:
Mike S
Employee Noah M
Updated by:
Noah M
Employee Sabrina W
Updated by:
Sabrina W

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924