This aluminum chain tension adjuster is an RC-scale replacement part for Team Losi Promoto-MX motorcycles, specified as model JR-LMX08-GR. It provides a stable, corrosion-resistant mounting point for final chain tension and lateral alignment on Promoto-MX style dirt bike kits.
Made from aluminum with a green anodized finish, the adjuster replaces the stock plastic or alloy item and installs into the original Promoto-MX rear mounting points. It retains factory geometry while offering a firmer feel for incremental chain adjustments, helping keep chain play steady under the loads seen on 1/10 scale motorcycle models.
Installation is straightforward for hobbyists used to motorcycle hop-ups: remove the stock adjuster at the rear wheel, locate the factory fasteners and mounting points, and fit the JR-LMX08-GR unit in the same position. Tighten to the chassis recommended torque and check chain tension through its full travel to confirm alignment before running.
For tuning, this adjuster acts as a precise endpoint for incremental chain length and alignment changes. It assists when dialing in rear wheel tracking or switching chain types, and its aluminum body resists deformation compared with softer components to help keep setups repeatable during maintenance sessions.
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