LOSI PROMOTO-MX Motorcycle 25T Servo Arm by GPM MX2025T  [MX2025T]

Aluminum 7075 25T Servo Arm for PROMOTO-MX

This is an aluminum 7075 25T replacement servo arm designed for RC-scale use on LOSI PROMOTO-MX motorcycle models. Machined from 7075 aluminium, the arm replaces the stock plastic component at the servo area to reduce flex under braking and steering loads while keeping installation straightforward for hobby maintenance and tuning.

The part is intended for the servo output splines and works as a direct mechanical interface between the servo and brake or steering linkage. In practice the stiffer aluminium arm helps preserve servo alignment during repeated stops and aggressive throttle-to-brake transitions, which can make brake response more consistent without changing electronics or servo settings.

Installation is standard for spline-style servo arms: remove the existing plastic arm, align the 25T spline, secure with the original retaining screw, and confirm full range of motion before running. Fine-tune linkage length and horn angle as needed to retain neutral steering and correct brake engagement travel.