GPM Racing Aluminium 7075-T6 Rear Wheel Hub Hex (Larger Inner Bearings) for Losi Promoto-MX Motorcycle RTR FXR (MX007)

Rear hub hex engineering notes

Part MX007 is a machined 7075-T6 aluminium rear hub hex designed for LOSI PROMOTO-MX rear wheel assemblies. The component is fabricated to preserve bore concentricity and reduce deformation under torque, providing a stable mounting surface for the rear wheel and bearings.

The hub accepts larger inner bearings and uses a bearing positioning column to maintain axial location and seat alignment during assembly. The included bearings correspond to the common RC sizes listed below, and the hub interfaces with the Promoto-MX rear wheel and mainshaft when the drivetrain conforms to the compatible model specifications.

For workshop practice, press bearings using a support that bears on the outer race and verify final runout with a dial indicator if precise alignment is required. Confirm axle hex dimensions and use OEM-spec fasteners or matched replacements to avoid stress concentrations in the aluminium hub.

Packing includes

• Rear Wheel Hub Hex – 1pcs
• Bearing positioning column – 1pcs
• Bearing 5x14x5 – 1pcs
• Bearing 8x16x5 – 1pcs

Original Name / Part No:

LOS262012,LOS262014

Compatible Models

• LOSI-1/4 PROMOTO-MX MOTORCYCLE RTR, FXR-LOS06000
• LOSI-1/4 PROMOTO-MX MOTORCYCLE RTR, FXR-LOS06002

Use MX007 when a stiffer, more repeatable rear hub interface is required for setup or testing; follow measured installation practices and verify bearing seating and axial alignment after assembly.

What is the recommended bearing installation method?

Press bearings on using a tool that contacts the outer race and apply slow, even force to avoid skewing the bearing; verify seating depth against the positioning column.

How should I check hub concentricity after fitting?

Mount the hub on the axle and rotate under a dial indicator to measure runout; tolerance depends on your setup but aim for minimal lateral runout for best performance.

Which fastener spec is safest for this hub?

Use original hub screws or equivalent fasteners that match OEM thread and length to avoid crushing the aluminium; avoid overtightening and use a calibrated driver when possible. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.