This 7075 alloy transmission housing is an aftermarket replacement designed for LOSI Promoto-MX motorcycles. Machined from 7075 aluminium as stated in the source, the housing swaps in for the factory plastic unit on the listed Promoto-MX models to boost drivetrain rigidity and durability.
The assembly ships with a single 5x13x4 bearing to match the mounting interfaces. It installs using the motorcycle's existing fasteners and drivetrain components; ensure correct alignment and bearing seating during assembly to avoid imposing preload on the spur and pinion engagement.
Practically, this upgrade reduces gearbox flex and shields gears from impact or accelerated wear during aggressive riding, while keeping serviceability consistent with the original layout.
LOS262008
For racers and weekend riders upgrading PROMOTO-MX bikes, this GPM aluminium housing delivers a direct-fit replacement focused on gearbox rigidity; verify compatibility with the listed models and check bearing installation during reassembly.
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