MUGEN MRX5 Suspension Lower Arm Shaft (Spring Steel) by Arrowmax AM-MRX5-H2105  [AM-MRX5-H2105]

MRX5 lower arm shaft replacement

The Arrowmax AM-MRX5-H2105 front lower arm shaft is made for the MUGEN MRX5 chassis and constructed from spring steel with a titanium nitride surface treatment. This finish lowers friction at the pivot interface and helps resist wear from repeated running. The item ships as two pieces for use on one side or as matched replacements.

Functionally this is a direct-fit wearable part that influences how the suspension moves and recentres. Reducing friction at the pivot can improve predictability and keep handling consistent between runs. The coated finish also helps prevent binding against plastic or metal arms and retention hardware.

Fitment notes: ensure the shaft aligns with the MRX5 lower arm and check the mating holes for excess play. Replace as a matched pair if you find scoring or wear, and confirm retaining clips or screws are correctly installed. Use a small amount of RC-safe lubricant on contact areas as needed, avoiding heavy greases that trap dust.