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

Lightweight Aluminum Rear Rotor for Promoto-MX

This aluminum rear brake disc is an RC-scale replacement part made for the Promoto-MX motorcycle chassis and supplied by Jazrider under model JR-LMX07-DB. It serves as a tougher, metal rotor alternative where modelers prefer durability over the stock plastic disc.

Fit and compatibility: this rotor is produced for the Promoto-MX model family. Before fitting, confirm the rotor seats flush on the hub and that the mounting holes match the rear hub flanges on your bike. Do not force fit this disc to other chassis unless the bolt pattern is verified identical.

Installation notes: retain the original mounting hardware when possible and tighten screws evenly to preserve concentric alignment. Check for rotor runout by spinning the wheel on a stand and make small hub adjustments if needed. Avoid overtightening to prevent thread damage.

Tuning impact: changing to an aluminum disc alters thermal mass and stiffness compared with plastic rotors, which may change braking feel during scale runs. Fit compatible brake pads and test stopping performance at low speed before regular use. This item is intended for remote-controlled models only and not for use on real vehicles.