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  1. Anti-Sway Bars
  2. Roadmaster
  3. Anti-Sway Bar
  4. Rear
  5. Steel w Polyurethane Bushing
  6. 1-1/8 Inch Diameter
Roadmaster Rear Anti-Sway Bar

Roadmaster Rear Anti-Sway Bar

Item # RM-1209-128
Our Price: $347.56
You Save: $69.93
Anti-Sway Bars

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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 rear 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-1209-128 or order online at Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Rear Anti-Sway Bar. Anti-Sway Bars reviews from real customers.
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Roadmaster Anti-Sway Bars - RM-1209-128

  • Anti-Sway Bar
  • Roadmaster
  • Rear
  • Steel w Polyurethane Bushing
  • 1-1/8 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 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
  • Made in the USA


  • Bar diameter: 1-1/8"
  • 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.

1209-128 Road Master Anti-Sway Bar - Rear

Installation Details RM-1209-128 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Rear Anti-Sway Bar - RM-1209-128

Average Customer Rating:  4.8 out of 5 stars   (1323 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.


The sway bar is high quality compared to the oem bar. I have a 2020 MBZ 2500 Sprinter 144. Basically, the roadmaster is three time the factory bar in terms of weight. And it shows. I took it on a ride down some winding roads and sharp turns and the back end feels much stiffer which equals control. I travel alot on Socal freeways to get to my destinations and it was very unnerving when driving next or passing freight trucks. I also pass through valleys and the winds can really making driving a bit uneasy. So, I anticipate this mod will add to my comfort level as well as my passengers. Time will tell. Now for some thing negative, well not quite but still some information buyers will need to know about installation. My van came with endlinks that were not compatible with the roadmaster. I knew this and order a set of end links for a 2019 model. Be aware that you will need new end links if you want to fit this bar to your 2020 model. At least that was the case for me. See pics. Overall, I'm satisfied and the cost is definitely worth the peace of mind.


Exact fit for my Dodge Sprinter 2500 170wb with single rear tire. Complete with instructions and hardware.

The product is definitely an upgrade from the factory one. It made a huge improvement on my sprinter 2500 170 ext handling and cross wind esp when passed by a semi at hway speeds
Bel - 11/17/2022


The stock rear sway bar is pencil thin, after the very easy install the Van
was void of rocking passing trucks and swaying in driveways. My wife even commented on the ride improvement. Well worth the cost, with the shock upgrade and large tires the Van handles very well.

Mercedes-Benz Sprinter

I have a sprinter 144 adventure van conversion with alot of weight up high the bar made it a lot less scary in a cross wind

2021 Mercedes-Benz Sprinter 2500

The parts arrive in a good packaging,right on time I install them myself very easy instructions to follow, after I install everything, got out if my driveway and I notice a big difference good product and very easy and simple to install, I cannot forget to mention the customer service is excellent.

Mercedes-Benz Sprinter

Sway bar was easy to install and helped the handle of the Sprinter when driving with cross winds

2021 Mercedes-Benz Sprinter 2500

Etrailer has their act together. Great website to find what you’re looking for - really fast shipping- low prices on quality merchandise. Good after the sale service. I’m sold.

Mercedes-Benz Sprinter

The roadmaster sway bar for my mercedes sprinter was a perfect retro fit and very easy to install. Description and instructions were spot on. Excellent purchase and customer service. Two thumbs up

The sway bar works perfectly...much less sway and no whiteknuckles when passing semis or windy days.
John - 10/25/2020

Chevrolet SS

Far superior in handling for my Roadtrek SS over the stock bar.

2011 Mercedes-Benz Sprinter

The product arrived quickly and complete from etrailer. I had these installed on my 2011 Sprinter 2500 144" about a year ago by a regional tire store. Seems like they charged me an hours labor, maybe a bit more. At first they were a bit tentative about installing someone else's product, but once they saw it, they said no problem. I remember them saying it was really straightforward with no unexpected challenges.
Huge improvement. I didn't think it would make that much of a difference, but I noticed it immediately driving out of the mechanic's parking onto the street. The old rocking after crossing uneven ground is gone, but it's not too abrupt, either. I think it makes highway driving better as well but maybe that's my imagination. I've put on almost 20k miles since, and no complaints. Considering the many modifications and upgrades I've done since buying this Sprinter new, this is probably the best bang for my buck so far. Should have done it earlier, but I appreciate it more now, I suppose...

2009 Dodge Sprinter

Ordered on Monday and received on Friday. Installed on Saturday. No problem other than I had to trim the urethane bushings with a razor blade so hanger bar would fit over the sway bar end. Etrailer did an excellent job.

Bar made major improvement. Reduced understeer. Sold van and bought Ford Transit. Do not think Ford will require any suspension changes. It is already a much better handling van than the Sprinter.
Dave O - 02/20/2015

2014 Ram 2500

2014 sprinter 2500 sway bar install , Being a non-mechanic the sway bar went in without a hitch probably took me a little over an hour to take the old one off and re-place it with the new one, I used two straps over the sprinter axle to hole the sway bar in place while I bolted it in. It definitely made the ride more stable though I still have to replace the rear shocks which will certainly also help , great product great service thanks


anti sway bar delivered, service was very good, anti-sway bar looks to be of excellent quality

2015 Mercedes-Benz Sprinter

This is a great product and have used it on my motorhome before, road master sway bar replaces little stock sway bar and mounts in stock sway bar area, unlike hellwig sway bar that uses brackets on axle and slides out of original place, spend a little more and only buy roadmaster sway bars you will not regret it! Also Etrailer was fast in shipping and instal was really easy only took 25min!

2008 Dodge Sprinter

Another great product from etrailer. Bolted right on to my Sprinter 2500 144wb. Would be good if etrailer could show the instructions as one of the photos for the product so you know what you have to do before it arrives. This sway bar is a huge difference over the stock and was noticeable within 50' of driving the sprinter. One of the best mods you can make to your sprinter from a handling point.

Mercedes-Benz Sprinter

It really helped reduce the sway in my high top Sprinter Van. Also changed the stock Helper springs to sumo brand ones.

2018 Mercedes-Benz Sprinter

1. The install was pretty straightforward, it took me a little over an hour doing it myself. I went for a test drive an notice a major different in the ride, but the real test was when the wife said she not on a roller coaster ride. If you are looking to improve your Sprinter sway i would highly recommend this item.

2012 Mercedes-Benz Sprinter

This is a must for my 12 passenger Sprinter. It helps reduce the effects of wind and of passing semi trucks on interstate highways. Helpful installation tip: you need to be on a level surface to install it.


Great fit. Big difference.

Ram 2500

Only put about 2500 road miles on the vehicle. Go hit with 25 to 30 mph winds. And didn't even notice them. Handles great. Thank you




Everything was perfect. The order, shipping, install


2013 Mercedes-Benz Sprinter

Show More Reviews

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

  • Rear Anti-Sway Bar from Roadmaster for a 2017 Mercedes-Benz 2500
    For an Anti-Sway bar from Roadmaster that is a confirmed fit for your 2017 Mercedes-Benz Sprinter 2500 you will need part # RM-1209-128. Keep in mind that this is an upgrade to a pre-existing OEM anti-sway bar so if none is present you will also need to install part # RM-1209-128.
    view full answer...
  • Does Roadmaster Sway Bar # RM-1209-128 Fit 2016 Mercedes-Benz Sprinter
    Yes, the Roadmaster sway bar part # RM-1209-128 that you referenced is a confirmed fit for your 2016 Mercedes Sprinter 2500 and would work well.
    view full answer...
  • Rear Sway Bar Recommendation for 2015 Mercedes Benz Sprinter Class C Chassis Pleasure Way
    The difference between the two Roadmaster sway bars is the specific 2015 Mercedes Sprinter you have. The part # RM-1209-128 is for the 2500 van and cutaway models but yours is the 3500 Class C model so the rear sway bar is the part # RM-1209-131. At this time there isn't a front sway bar available, but the rear sway bar is the one that makes the biggest difference so the one I recommended would still be a great option to improve your ride quality.
    view full answer...
  • Rear Anti-Sway Bar for a 2011 Sprinter 2500
    The correct rear anti-sway bar for a 2011 Sprinter 2500 is # RM-1209-128.
    view full answer...
  • Which Rear Anti-Sway Bar Fits a 2011 Mercedes Sprinter 2500
    I checked with Roadmaster and they list the rear anti-sway bar # RM-1209-128 as the correct fit for a 2011 Mercedes Sprinter 2500. I have also included a link to an FAQ article that covers stability control for heavy duty vehicles that you might find helpful.
    view full answer...
  • Recommended Rear Anti-Sway Bar For 2013 Mercedes-Benz Sprinter Motorhome
    We do offer rear anti-sway bars for your 2013 Mercedes-Benz Sprinter. If you have a 2500 the rear anti-sway I recommend is part # RM-1209-128. Using this bar helps reduce the effects of crosswinds and shifting cargo or passing vehicles. It attaches to the rear axle and chassis and includes the mounting hardware. If your motorhome is a 3500, the rear anti-sway bar you would need is part # RM-1209-120. I have attached a photo that shows how the anti-sway bar is normally attached on a...
    view full answer...
    Image 1 for
  • Rear Anti-Sway Bar for 2013 Winnebago Class C RV On Mercedes Sprinter Chassis
    If your 2013 Winnebago on the Mercedes Sprinter chassis is the 3500 chassis then you can use rear anti-sway bar # RM-1209-131. With this unit the factory sway bar will remain. If the chassis is the 2500 with the van cab the same as regular Sprinters but with a different body (this is called a cut away) then you would use # RM-1209-128. This unit replaces the factory sway bar. If the vehicle does not have a factory sway bar then you will also need mounting kit # RM-590064-00. The differences...
    view full answer...
  • Rear Anti-Sway Bar for a 2015 Mercedes Sprinter Class C Motor Home
    Roadmaster rear anti-sway bar # RM-1209-131 will fit a 2015 Mercedes Sprinter 3500, Class C. And it retains the factory anti-sway bar. Rear anti-sway bar # RM-1209-120 fits both the regular van models and RV cut-away models and replaces the factory anti-sway bar. An RV cut-away is just the van cab part and a different motor home body put on the rest of the chassis. If you happen to have a 2500 model then you would use # RM-1209-128. And if the vehicle did not come with a factory anti-sway...
    view full answer...
  • What is Included with Retro-Fit Kit for Sprinter Vans without Factory Sway Bars 590064-00
    The retro-fit installation kit, # RM-590064-00, for the 2009 Freightliner Sprinter 2500 contains the following items: Four 10mm x 1.5 Locknuts Four 10mm x 1.5 x 25mm Hex Bolts Two Bushing Clamps Two 12mm x 1.5 x 140mm Hex Bolts Two 12mm x 1.5 x 55mm Hex Bolts Four 12mm x 1.5 Locknuts Two Endlinks Since your RV did not come with the factory rear anti-sway bar you will need this kit to install anti-sway bar # RM-1209-128.
    view full answer...
  • Quantity of Parts Included in Roadmaster Replacement End Bushing for Rear Anti-Sway Bar
    Good news, I can help you figure out how many bushings you will need. According to the directions there are 4 # RM-205227-00 bushings included in the original # RM-1209-128 kit. The replacement bushings # RM-205227-00 are sold in the quantity of 1, so you will need to order 4 to replace both sides of your original Roadmaster Rear Anti Sway Bar. I have linked all the parts to the page for your convenience.
    view full answer...
  • Installation Instructions for Rear Anti-Sway Bar for 2016 Mercedes-Benz Sprinter 2500
    I have attached the installation instructions for the Roadmaster # RM-1209-128 to this answer, but this rear anti-sway bar will mount in place of your factory sway bar. If your 2016 MB Sprinter 2500 does not have a factory sway bar you will also need to add the Mount Kit # RM-590064-00. These mounts will connect to the frame and provide the mounting points for the Roadmaster sway bar.
    view full answer...
  • Why Doesnt Retro-Fit Kit for Dodge Sprinter Van 590064-00 Come with Bushings
    The part # RM-590064-00 is a part that is normally used with a sway bar kit # RM-1209-128 on Sprinter vans that don't have a factory sway bar. The sway bar part number does come with the needed bushings to use with the adapter.
    view full answer...
  • Sway Bar Recommendation for 2021 Mercedes Benz Sprinter 2500 without Factory Sway Bar
    For your 2021 Mercedes-Benz Sprinter 2500 that does not have a factory sway bar your best option is the part # RM-1209-128 with the mount kit part # RM-590064-00. The mount kit is for versions of your vehicle that do not have a factory sway bar and what allows the fit. This will make a dramatic improvement in the ride quality of your Sprinter that you will notice immediate.
    view full answer...
  • Recommended Anti-Sway Bar for Mercedes-Benz Sprinter 2500
    For your 2017 Mercedes-Benz Sprinter 2500, I recommend the Roadmaster Rear Anti-Sway Bar # RM-1209-128. This rear sway bar is confirmed to fit your Sprinter and will do a great job of minimizing side-to-side movement and improving its overall stability while traveling. This particular sway bar is designed to replace the factory sway bar on the Sprinter. If your model Sprinter does not have a factory bar, you will also need to add the Mount Kit # RM-590064-00 for installation. I have...
    view full answer...
  • Can a Rear Anti-Sway Bar Be Added to a 2017 Mercedes-Benz Sprinter 2500
    The 2017 Mercedes-Benz Sprinter 2500 could have came from the factory either with or without a rear anti-sway bar. If you do not have the factory rear anti-sway bar then in order to install the Roadmaster Rear Anti-Sway Bar part # RM-1209-128 you would also need the Retro-Fit Kit for Dodge Sprinter Van part # RM-590064-00. I spoke to my contact at Roadmaster and unfortunately they were not able to confirm if drilling is required or not due to the lack of testing. The only thing you would...
    view full answer...
  • Sway Bar Recommendation for 2017 Mercedes Benz Sprinter 2500 without Sway Bar
    For your 2017 Mercedes Benz Sprinter 2500 the Roadmaster sway bar kit part # RM-1209-128 is a confirmed fit and will work great. Since you do not have a factory sway bar you will need to also use the # RM-590064-00 when you install it. If you check out the installed picture I attached for this sway bar you'll see that it mounts at an angle so getting the cut out dimension as it would be parallel to the ground may not be helpful. The picture though would most likely let you know if you...
    view full answer...
    Image 1 for
  • What Rear Axle Anti-Sway Bar Fits My 2022 Mercedes-Benz Sprinter 2500 Van?
    From the sounds of your question, it sounds like you are looking for a rear-axle anti-sway bar for your 2022 Mercedes-Benz Sprinter 2500 van. If this is the case, we got you covered! The part you need is the Roadmaster Rear Anti-Sway Bar # RM-1209-128. This bar mounts to your rear axle and chassis in order to provide you with increased control and handling. If your van did not come with a factory anti-sway bar, you also need the Retro-Fit Kit # RM-590064-00 to complete the installation....
    view full answer...
  • Rear Anti-Sway Bar Fit For 2022 Mercedes-Benz Sprinter 2500
    Assuming you are referring to the passenger or cargo van (as opposed to the motorhome chassis) there is an option for a rear anti-sway bar on your 2022 Mercedes-Benz Sprinter 2500, from Roadmaster. The correct part is the following: - Roadmaster Rear Anti-Sway Bar # RM-1209-128 The # RM-1209-128 is an upgraded replacement for the factory anti-sway bar on your '22 Sprinter 2500. If your '22 Sprinter 2500 does NOT have a factory anti-sway bar you can still use the # RM-1209-128, but you...
    view full answer...
  • Best Option for Sway Control on a 2012 Mercedes-Benz Sprinter 2500
    Both the Timbren Rear Suspension Enhancement System part # TMBRSP25A and the SumoSprings Maxim Custom Helper Springs part # SSR-326-47-1 will help reduce the swaying and rocking issues you are having with your 2012 Mercedes-Benz Sprinter 2500. However, both of these products are more or less geared towards load leveling not necessarily sway control. The best option I have to help with swaying and rocking is a rear sway control bar or on vehicles that already have a rear sway control bar,...
    view full answer...
  • SuperSprings Rear Helper Springs on 2016 Mercedes Sprinter 2500 are Not Engaging
    Having that slight gap between the new SuperSprings # SSR-329-47 and the platform they make contact with is common not just with this brand but with others as well. It allows your suspension to compress some so as not to have too much of an effect on the unloaded ride quality. Since the springs are not engaging at the rear of your 2016 Mercedes Sprinter 2500 that means that the factory suspension is not compressed enough. And that means that the amount of weight you have in the van is...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
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Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Wilson B
Updated by:
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Employee Isabelle B
Updated by:
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