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2017 Chrysler 300
Roadmaster
Roadmaster Rear Anti-Sway Bar - 1-1/8" Diameter
Part Number: RM-1209-128
In Stock
$375.00
Retail:$559.95
You Save: $184.95
2017 Chrysler 300
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- All Info
- Reviews (2529)
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Roadmaster Anti-Sway Bars - RM-1209-128
Highlights
- Custom Fit for Your Vehicle: Tuned to your suspension for better control and stability.
- Reduces Sway: 1-1/8" 4140 chromoly steel bar cuts side-to-side body roll for a steadier ride.
- Handles Crosswinds: Keeps your vehicle level against gusts, passing traffic, and shifting cargo.
- Less Driver Fatigue: Cuts steering corrections so long drives feel smoother and more relaxed.
- Improves Cornering: Balances weight transfer for controlled turns and stable highway handling.
- Uses Existing Mounts: Installs on rear axle and frame with included heavy-gauge hardware.
Features to know about
Better Highway Control: Rear Bar Reduces Body Roll
Nothing throws off confidence like feeling your rig lean through a turn or sway in a crosswind. The 1-1/8" diameter Roadmaster rear anti-sway bar ties the axle to the chassis, balancing weight transfer and keeping the vehicle flatter through curves and quick maneuvers. It cuts out the side-to-side rocking that shows up when you’re hit by gusts or passing trucks, keeping things level and predictable on the highway.
Less Fatigue on Long Drives: Stable, Easy Steering
You can feel the difference right away. By taking the fight out of crosswinds and body sway, the bar makes the steering steadier so you’re not constantly correcting. It’s easier to hold your line mile after mile, whether the road is smooth or uneven. The ride stays level, and the trip feels calmer and less tiring.
Built to Last: 4140 Chromoly Steel with Polyurethane Bushings
Roadmaster builds this bar from thick 4140 chromoly steel, a tougher alloy than standard 1020 steel. The larger diameter adds torsional stiffness, giving it nearly 30 percent more resistance to sway. Polyurethane bushings replace the usual rubber, standing up to oil, gasoline, and ozone without squishing out. The result is consistent support and long-term durability.
Straightforward Install: Bolt-On Hardware with No Drilling
All the heavy-gauge mounting hardware, bushing lubricant, and easy-to-follow instructions come in the box. The bar bolts to the rear axle and chassis using existing points, so there’s no drilling required. It’s a clean, direct fit that works alongside popular suspension upgrades and gets you back on the road fast.
Specs
Bar Specifications
- Bar diameter: 1-1/8"
Warranty
- Limited Lifetime Warranty
1209-128 Road Master Anti-Sway Bar - Rear
This Product Fits The Following Vehicles
- 2008 - 2009 Dodge Sprinter 2500 - Cargo and Passenger Van
- 2008 - 2015 Freightliner Sprinter 2500 - Cargo and Passenger Van
- 2010 - 2015 Mercedes-Benz Sprinter 2500 - Cargo and Passenger Van
- 2016 - 2021 Freightliner Sprinter 2500 Cargo and Passenger Van
- 2016 - 2025 Mercedes-Benz Sprinter 2500 Cargo and Passenger Van
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
- Wrong item was ordered
Ratings & Reviews
4.8
2529 reviews
by:
Veety
10/01/2026
2025
Ram
2500
2025 Sprinter 2500 low roof WITH factory sway bar. Added this bar to control the terrible handling at the rear of these vans and it absolutely takes care of that. Be aware that you 100% need the retro-fit kit for this bar to be installed as the factory sway bar end links will NOT work. The retrofit kit that you need is the RM-590064-00.
by:
Gabriel
07/28/2021
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.
by:
K P
11/28/2025
Ram
3500
The bolts the bolts that attach the new sway bar are too short as the new sway bar is thicker and should have been included in the kit .
I was lucky to locate factory Mercedes Benz bolts of the proper length. From a 3500 Sprinter.
I was lucky to locate factory Mercedes Benz bolts of the proper length. From a 3500 Sprinter.
by:
Tony
05/18/2026
Product is great. Well packaged and great instructions. Easy to mount
by:
Mark S
01/23/2026
This is the best thing you can do to improve your Sprinter!
by:
John
10/16/2019
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
by:
Dave Orton
08/10/2013
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.
Dave O.
2/20/2015
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.
by:
Kevin
06/15/2024
The sway bar is good quality and probably does help with the cornering and the wind buffing from the semi trucks on the freeway.
The negative side is the bolts supplied adapter kit were under sized diameter to the point of ratting when you walked back and forth in the camper. To correct the problem I had to drill the poorly punched holes in the shackle to a true 1/2" then purchase new bolts and lock nuts that fit the bushings. After all the labor and expenses the sway bar has worked as intended with no noise. The other thing I had not considered was how much traction you loose on uneven ground but that is the trade off with better highway control.
The negative side is the bolts supplied adapter kit were under sized diameter to the point of ratting when you walked back and forth in the camper. To correct the problem I had to drill the poorly punched holes in the shackle to a true 1/2" then purchase new bolts and lock nuts that fit the bushings. After all the labor and expenses the sway bar has worked as intended with no noise. The other thing I had not considered was how much traction you loose on uneven ground but that is the trade off with better highway control.
by:
John
04/16/2023
2021
Mercedes-Benz
Sprinter 2500
E trailer is.my go to place for anything towing trailering etc Absolutely the best products as well and the best service and the best people!!!!
John
4/17/2024
The Sumo shocks made it possible for me to tow a small jeep behind my Sprinter van. We were ready to sell the van and the gang at etrailer just didnt give up until we had the swaying solved
Bud M.
5/14/2024
@John
Great to hear. Thank you for the update.
by:
Jerry
07/14/2023
One year review. This sway bar has worked out perfectly. Mad a big and noticeable difference when driving my Sprinter 2500 High top accross the windy plains. I’m pretty mechanical but even for a novice I think install wouldn’t be difficult. Just be sure to have the right bushings and bushing grease along with hardware brackets and bolts for your specific install. The folks at etrailer are really helpful with questions and troubleshooting as well.
by:
Artie
09/15/2022
2018
Mercedes-Benz
Sprinter 2500
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.
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.
Artie R.
9/16/2023
I dont think about it, until I remeber how the Stock sway bar didnt control the sway. Easley the most cost effective ungrage on mt Sprinter. I just dont think about now. My Sprinter handles all raods without sway.
by:
Marlin
02/08/2022
Mercedes-Benz
Sprinter
Sway bar was easy to install and helped the handle of the Sprinter when driving with cross winds
Marlin
2/9/2023
It’s still doing it’s job helps on the corners and the handing in the wind
by:
Paul E.
04/11/2016
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...
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...
by:
Peter
05/07/2019
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
by:
Bel
11/16/2021
Exact fit for my Dodge Sprinter 2500 170wb with single rear tire. Complete with instructions and hardware.
Bel
11/17/2022
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
by:
Tom N.
10/08/2016
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!
by:
Chico
01/22/2021
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.
by:
Lee
12/14/2020
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.
by:
Jeff
12/16/2021
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.
by:
Ben S.
10/09/2017
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.
by:
Hector
06/17/2022
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.
by:
SM
01/21/2022
Chevrolet
SS
Far superior in handling for my Roadtrek SS over the stock bar.
Sm
1/22/2023
This is a short wheelbase high roof Sprinter that handles like a sportscar
by:
GREG
10/18/2024
2018
Mercedes-Benz
Sprinter
Part fit perfectly, corrected excessive sway in my 2018 sprinter campervan, 144 inch wb, tall.
by:
J Marvin
07/15/2021
anti sway bar delivered, service was very good, anti-sway bar looks to be of excellent quality
by:
Patrick
12/28/2018
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
25
2529
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Show More Reviews
See what our Experts say about this Roadmaster Anti-Sway Bars
- Do You Have a Swaybar for a 2022 Mercedes-Benz Sprinter 2500?Hey Tony! I checked with our vendors and the only option for a sway bar on your 2022 Mercedes-Benz Sprinter 2500 is the 1-1/8" Roadmaster Rear Anti-Sway Bar item # RM-1209-128. However, this is just meant as a replacement option for the factory one if your Sprinter came with one. The only option I have to help you with sway is the SumoSprings Rebel Custom Helper Springs item # SSR-327-47-2. These are custom fit for your 4WD Sprinter and have a 5,000 lbs capacity. These two piece springs...
view full answer... - Recommended Sway Bar for 2020 Mercedes-Benz Sprinter 2500Really good question Steve, The best option would come down to driving habits and how the Sprinter is being used. Roadmaster Rear Anti-Sway Bar # RM-1209-128 is more aggressive sway control with a thicker 1-1/8 inch bar and known for maximum stability. So it's best when you have consistent heavy loads, top heavy lean or interstate travel. Hellwig Rear Sway Bar # HE54FR prioritizes ride comfort over maximum control and is often easier on rough pavement. So it's best for city and daily...
view full answer... - Anit-Sway Bar for 2021 Dynamax Isata 3Hi John; is your 2021 Dynamax Isata 3 on the 2500 or the 3500? If it is the 2500 you can use the Roadmaster Rear Anti-Sway Bar # RM-1209-128. If you don't have a factory sway-bar you will also need the # RM-590064-00. If this is the 3500 you need # RM-1209-131 instead. We don't carry any shocks for the Sprinter but I would stick with the same Bilstein you have now.
view full answer... - Rear Sway Bar and SumoSprings for 2024 Mercedes Sprinter High RoofHey Jim, you would want the Roadmaster rear bar part # RM-1209-128 for your 2024 Mercedes Sprinter High Roof 2500. The feedback we've gotten on this bar for your Sprinter has been really good for improving the handling and reducing sway. Then for a front set of SumoSprings you would want the part # SSF-106-47 and you'd be set.
view full answer... - Best Sway Bar For 2024 Mercedes-Benz Super Single Hey Kent, thanks for reaching out. We do have a sway bar for the 2024 Mercedes-Benz Sprinter 2500 with the single rear wheels. For that I recommend the following: - Hellwig Rear Anti-Sway Bar - 1-5/16" Diameter # HE54FR This is made specifically for single rear wheel models. It'll bolt up directly to the axle and frame with no drilling required. Is your sprinter a passenger van? Or class C?
view full answer... - Sway Bar Recommendation for 2017 Mercedes Benz Sprinter 2500 without Sway BarFor 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...
- Sway Bar Recommendation for 2021 Mercedes Benz Sprinter 2500 without Factory Sway BarFor 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 Rear Anti-Sway Bar For 2013 Mercedes-Benz Sprinter MotorhomeWe 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...
- SuperSprings Rear Helper Springs on 2016 Mercedes Sprinter 2500 are Not EngagingHaving 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... - Recommended Anti-Sway Bar for Mercedes-Benz Sprinter 2500For 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... - Best Option for Sway Control on a 2012 Mercedes-Benz Sprinter 2500Both 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... - Installation Instructions for Rear Anti-Sway Bar for 2016 Mercedes-Benz Sprinter 2500I 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... - Can a Rear Anti-Sway Bar Be Added to a 2017 Mercedes-Benz Sprinter 2500The 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... - Rear Anti-Sway Bar for 2013 Winnebago Class C RV On Mercedes Sprinter ChassisIf 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 HomeRoadmaster 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... - 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... - What is Included with Retro-Fit Kit for Sprinter Vans without Factory Sway Bars 590064-00The 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... - Why Doesnt Retro-Fit Kit for Dodge Sprinter Van 590064-00 Come with BushingsThe 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... - Recommended Rear Anti-Sway Bar For A 2013 Mercedes-Benz Sprinter MotorhomeThe correct fit is going to vary depending on whether your more Mercedes-Benz Sprinter is a 2500 or 3500 and whether it's a Class B or Class C Motorhome. From what I can find the model you referenced is a Class B but I'll go ahead and list out the Class C fits just incase. Class B: 2500 part # RM-1209-128 3500 part # RM-1209-120 Class C: 2500 part # RM-1209-128 3500 part # RM-1209-131
view full answer... - Rear Anti-Sway Bar for a 2011 Sprinter 2500The 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 2500I 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... - Rear Anti-Sway Bar from Roadmaster for a 2017 Mercedes-Benz 2500For 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... - Rear Sway Bar Recommendation for 2015 Mercedes Benz Sprinter Class C Chassis Pleasure WayThe 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...
Do you have a question about this Anti-Sway Bar?
Info for this part was:
Written by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Video Edited:
Dustin K
Video Edited:
John S
Updated by:
Wilson B
Updated by:
Isabelle B
Updated by:
Sabrina W
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John
10/25/2020
The sway bar works perfectly...much less sway and no whiteknuckles when passing semis or windy days.