LOSI Promoto-MX Precision Rear Hex JR-LMX03-GD Upgrade by Jazrider  [JR-LMX03-GD]

Promoto-MX wheel hex upgrade

This aluminum rear wheel hub hex is a direct-fit RC accessory for Team Losi Promoto-MX motorcycle chassis. Machined aluminum with a gold coating provides a firmer, more consistent interface between wheel and axle compared with standard plastic hexes, helping to maintain alignment when the bike is under load.

Fitting is straightforward: remove the stock hex, slide the aluminum unit onto the axle mating face, and secure with your existing wheel-retaining screw. Ensure the hub seats fully against the wheel hub and that any bearings or collars remain correctly positioned before final tightening.

For tuning and upkeep this component reduces flex at the wheel connection and delivers a tougher wear surface for repeated wheel changes. Regular checks of seating and retention hardware are recommended to ensure reliable operation.