LOSI Promoto-MX Chain Guidance Roller 70 MX070 by GPM  [MX070]

Promoto-MX chain guidance roller

This chain roller is an RC-scale replacement made for the LOSI Promoto-MX motorcycle platform. It pairs a manganese steel chain element with a 70-size roller to re-establish correct lateral guidance and reliable tracking on 1/4 scale Promoto-MX models. The component is intended to deliver consistent drivetrain behaviour during practice and track use.

Intended fitment is for the Promoto-MX RTR variants listed below. Installation requires removal of the worn roller, correct alignment of the chain over the new unit and secure refitting to the original mounting points. After installation, double check chain tension, lateral alignment and the condition of the roller mount prior to running.

As a maintenance component rather than a performance add-on, keeping the chain aligned with this roller reduces uneven wear on chain and sprockets and maintains a stable drive feel under throttle transitions.