LOSI Promoto-MX Motorcycle Manganese Steel Chain 70 Roller by GPM MX070  [MX070]

Promoto-MX chain and roller for LOSI

This GPM replacement chain roller is an RC-scale drivetrain spare designed for the LOSI Promoto-MX motorcycle platform. It uses a manganese steel chain element paired with a 70-size roller to restore lateral guidance and chain tracking on 1/4 scale Promoto-MX units. The part focuses on drivetrain reliability and predictable behaviour during regular track or practice use.

Fitment is intended for the listed Promoto-MX RTR models; install requires removing the existing roller and aligning the chain path before securing the replacement. Check chain tension and lateral alignment after fitting, and inspect the roller mount for wear or deformation before reuse. The component is a direct replacement style part intended to integrate with the motorcycle's existing mounting points and chain routing.

For tuning, this roller is primarily a service item rather than a performance upgrade; consistent chain alignment helps reduce uneven wear on the chain and sprockets and preserves a stable drive feel under throttle changes.