LOSI Promoto-MX Rear Wheelbase Extension +30mm Swing Arm Kit MX3057 by GPM  [MX3057]

TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057
Price:
CAD$185.73
Brand:
GPM
Model:
MX3057
GTIN:
4894538379105
Condition:
Brand New
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alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Extend Swing Arm (+30mm)+Pull Rod+Chain - GPM MX3057"

30mm extended rear arm upgrade for Promoto-MX

The MX3057 kit from GPM is a purpose-built aluminium upgrade that replaces the stock rear linkage with an extended swing arm, a lengthened pull rod and a matched chain to increase the rear wheelbase by 30mm on LOSI Promoto-MX machines. The parts are machined aluminium designed to restore correct geometry after extension while keeping a compact, scale appearance.

The upgrade is tuning-oriented rather than decorative: lengthening the swing arm shifts chassis balance and changes rear traction behaviour. The longer pull rod and supplied chain keep steering geometry and final drive alignment correct once the arm is fitted. Installation requires removing the factory arm and reusing bearings and fasteners where applicable; no specialised tools are required beyond standard workshop gear.

Fit this kit to improve high-speed stability or to refine traction on firmer surfaces; always confirm compatibility with your exact LOSI Promoto-MX variant and check chain alignment during break-in runs.

Packing includes

  • Extend swing arm(+30mm) - 1pcs
  • Pull rod - 1pcs
  • Chain - 1pcs

Original Name / Part No:

LOS264000+LOS264001+LOS262000

Compatible Models

  • LOSI-1/4 PROMOTO-MX MOTORCYCLE RTR
  • FXR-LOS06000LOSI-1/4 PROMOTO-MX MOTORCYCLE RTR PRO CIRCUIT-LOS06002

The MX3057 aluminium +30mm swing arm kit gives a direct route to lengthen the wheelbase on specified LOSI Promoto-MX platforms, supplying the longer pull rod and chain required after extension and helping tune rear traction and stability on the motorcycle chassis.

What tools do I need to fit the extended arm?

Basic hand tools such as hex drivers, pliers and a small socket set are sufficient; you will transfer bearings and fasteners from the original arm unless replacements are needed.

Will the supplied chain require adjustment?

Yes, fine-tune chain tension and check alignment after installation. The supplied chain matches the extended geometry but initial tensioning is recommended before running.

Does the extension affect gearing or sprocket fitment?

The kit keeps final drive alignment with the matched chain; you should re-check sprocket alignment and retain stock sprockets unless you plan a separate gearing change.

What handling changes should I expect after fitting?

Expect increased straight-line stability and a shift in rear traction feel. Use the extension alongside suspension and tyre adjustments to achieve the handling balance you prefer.

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