LOSI Promoto-MX Scale Rear Brake Disc JR-LMX07-DB - Aluminum Upgrade by Jazrider  [JR-LMX07-DB]

Scale Rear Brake Disc for the Promoto-MX Bike

This aluminum rear brake disc is a replacement rotor tailored to the Promoto-MX motorcycle chassis and produced by Jazrider as model JR-LMX07-DB. It provides a stronger metal option for scale dirt bike projects that need improved wear resistance over plastic rotors.

Compatibility notes: built to suit the Promoto-MX family. Verify the rotor lays flat on your hub and that the screw holes line up with the rear hub flange before committing to the fit. Do not attempt to modify the part to fit a non-matching chassis.

Fitting advice: where possible reuse the factory mounting hardware and tighten bolts in stages to keep the rotor concentric. Use a wheel jig or stand to check for any lateral runout and make minor hub adjustments as required. Prevent thread damage by avoiding excessive torque.

Performance note: an aluminum disc alters stiffness and heat dispersion compared with plastic, which can change the brake feel and fade characteristics. Combine this rotor with compatible pads and conduct slow-speed braking tests prior to full operation. Intended for remote-controlled models only.