RPM Traxxas X-Maxx Upper & Lower A-Arms (Black) (2)

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RPM Traxxas X-Maxx Upper & Lower A-Arms (Black) (2)
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RPM Traxxas X-Maxx Upper & Lower A-Arms were developed to handle the weight and the punishment the massive X-Maxx trucks can dish out. Starting with the upper A-arm, RPM used their proven A-arm designs from past successful builds to create an upper support structure sure to handle anything you can throw at it! The lower A-arm has better ground clearance than stock A-arms and has a cross section based off of the proven RPM 1:5 scale HPI Baja A-arms so you know they’re tough! They also created a double support beam on the lower arms to spread impact energy over a larger area, meaning hard hits won’t force you into the “walk of shame”. They’re also universal fit, which means they’ll fit on any corner of your truck!

RPM X-Maxx A-arms are molded in RPM's trademark blend of incredibly tough, engineering grade nylons and made in the USA. RPM X-Maxx arms are backed by their industry-leading limited lifetime warranty against breakage for worry-free performance you can count on!

NOTE: Each package comes with one upper and one lower A-arm. Four packages will be needed to complete one full vehicle.


  • Stronger than stock
  • Lighter than stock
  • Sold with 1 – upper and 1 – lower a-arm in each package
  • 4 packages needed per vehicle
  • Replaces the upper a-arm from stock Traxxas TRA7729
  • Replaces the lower a-arm from stock Traxxas TRA7730 & TRA7731

This product was added to our catalog on June 21, 2016

Reuben de Vries
Verified Owner
Wednesday, Aug 15 2018 (about 5 years ago)
RPM Traxxas X-Maxx Upper & Lower A-Arms (Black) (2)
Tried these on my car and broke them within minutes. factory Maxx arms are a lot better. They certainly last a lot longer. Bottom arm broke where the shock mounts up. And rpm does not cover shipping costs outside of USA for warranty. Other side seems to be holding up fine. Along with the upper arms.
Verified Owner
Monday, Feb 4 2019 (about 4 years ago)
RPM Traxxas X-Maxx Upper & Lower A-Arms (Black) (2)
Much weaker than the stock arms. First and only run lasted about 3 minutes before the rear arm broke where it attaches to the axle carrier. 3 jumps completed. No wrecks, kartwheels, etc. Just landed and the wheel popped out at an awkward angle. Thanks RPM. This product was not worth the time it took to install let alone the money it costs.
Lorne Hutton
Tuesday, Oct 26 2021 (about 2 years ago)
RPM Traxxas X-Maxx Upper & Lower A-Arms (Black) (2)
i love them super tuff . only one problem the front lower pin pops out one high jumps. i am going to fix that problem with a a arm pin with nuts on both sides so it cant fall out when the a arm flexes . iv jumped like 30 plus foot high on concrete and no breakage.