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

Replacement roller for Promoto-MX drivetrains

This chain roller is an RC-scale spare built for the LOSI Promoto-MX motorcycle platform. It uses a manganese steel chain element and a 70-size roller to recover lateral guidance and accurate tracking on 1/4 scale Promoto-MX bikes. The unit is aimed at steady drivetrain performance during practice and club sessions.

Intended fitment is for the Promoto-MX RTR models listed below. Installation involves removing the worn roller, aligning the chain path with the new roller and securing it to the existing mount. After installation, recheck chain tension and alignment and examine the mount for any signs of fatigue before reuse.

Designed as a maintenance part rather than a power upgrade, this roller reduces uneven chain and sprocket wear and helps keep throttle response consistent by maintaining correct chain line.