Promoto-MX Adjustable Chain Tensioner, Aluminum - JR-LMX08-DB by JAZRIDER  [JR-LMX08-DB]

Aluminum chain tensioners suited to Promoto-MX

This chain tension adjuster set is intended for the Team Losi Promoto-MX Motorcycle platform and is produced by JAZRIDER. The components are CNC-machined from aluminum and finished in blue to replace factory plastic adjusters, giving a stable and repeatable adjustment point for chain tension and axle alignment on RC dirt bike chassis.

The set allows for precise tuning of chain slack and helps keep the driveline aligned following suspension or drivetrain work. It mounts around the swingarm axle region and is designed to function with the existing axle hardware, enabling controlled incremental movement so both sides of the swingarm match in tension.

Fitting guidance: position the adjusters at the axle slot, confirm the axle sits squarely within the adjuster, and use measured small adjustments to reach the desired chain tension before finalising axle fasteners. After tightening, inspect chain alignment and ensure the rear wheel rotates freely. These parts are designed for RC dirt bike use and assume familiarity with standard chassis adjustments.