LOSI Promoto-MX Motorcycle Aluminum Rear Wheel Hub Hex by JAZRIDER JR-LMX03-PU  [JR-LMX03-PU]

Rear wheel hub hex for Promoto-MX

This JAZRIDER JR-LMX03-PU is an aluminum rear wheel hub hex made for the Team Losi Promoto-MX motorcycle platform, offered in purple as an aftermarket replacement. It is an RC-scale component intended to locate and secure the rear wheel to the axle interface while transmitting drive load from the gearbox to the wheel.

The part is intended for straightforward replacement of a worn or damaged hub hex. Installation requires basic RC tools such as an appropriate hex driver and verification of wheel bearing fit; remove the wheel and axle hardware, swap the hex onto the axle spline or wheel adapter, then reassemble and check axial play. Keep fasteners at manufacturer-recommended tightness and inspect the fit against the wheel and bearings during the first runs.

In tuning and maintenance contexts the aluminum hub hex provides a rigid interface that can reduce flex compared with softer materials, and the anodized purple finish helps with parts identification during pit work. Use it as a direct service spare when restoring wheel alignment or preparing a Promoto-MX for track sessions.