LOSI Promoto-MX +30mm Swing Arm Tuning Kit MX3057 by GPM  [MX3057]

Extended swing arm +30mm for Promoto-MX tuning

The MX3057 aluminium kit replaces the standard rear arm with an extended unit, plus a longer pull rod and a matched chain to increase rear wheelbase by 30mm on LOSI Promoto-MX models. Components are precision-machined aluminium intended to maintain correct linkage geometry after the upgrade.

This kit is aimed at handling adjustments rather than looks. Stretching the swing arm alters weight distribution and rear grip characteristics; the supplied pull rod and chain keep steering and drive alignment within designed tolerances. Fitment involves swapping out the stock arm and refitting bearings and hardware as required, with only basic workshop equipment needed.

Use the extension to improve high-speed composure or to fine-tune rear traction on harder surfaces; always confirm vehicle compatibility and inspect chain alignment during initial testing laps.

Model MX3057 provides a practical aluminium +30mm arm upgrade for specified LOSI Promoto-MX variants, delivering the longer pull rod and chain needed after extension and serving as a simple tuning tool to alter rear traction and chassis balance.