LOSI Promoto-MX +30mm Aluminium Swing Arm Upgrade MX3057 by GPM  [MX3057]

Technical: +30mm aluminium swing arm for Promoto-MX

The MX3057 upgrade provides a CNC-friendly aluminium extended swing arm, matched pull rod and chain sized to lengthen the rear wheelbase by 30mm on compatible LOSI Promoto-MX chassis. The kit focuses on mechanical accuracy to retain steering geometry and final drive alignment after extension, enabling predictable handling changes when used as part of a chassis tuning program.

Installation requires removal of the factory arm and re-use or replacement of bearings and fasteners as appropriate; plain bearing fitment and correct torque values are essential to avoid endplay that could influence steering inputs. The longer pull rod maintains linkage geometry while the matched chain keeps sprocket alignment within operational tolerances.

Use this component where controlled increases in rear wheelbase are needed to refine high-speed stability or traction response. Check alignment and fastener torque during initial shakedown and after thermal cycles to ensure consistent performance.

This MX3057 aluminium +30mm swing arm kit supplies the precise hardware required to extend wheelbase on specified LOSI Promoto-MX platforms, providing matched linkage parts to preserve geometry and enable repeatable tuning changes.