LOSI Promoto-MX Motorcycle hub chain sprocket by GPM MX036S  [MX036S]

Medium carbon steel hub chain sprocket

This replacement hub chain sprocket is an RC-scale drivetrain part manufactured for LOSI Promoto-MX motorcycles and produced by GPM. The part is upgraded to medium carbon alloy steel to improve wear resistance and bending strength compared with basic stamped components, making it appropriate for routine maintenance and tuning on scale dirt bikes.

The sprocket's role is purely mechanical within the RC drivetrain: it engages the chain, transmits torque from the motor pinion and spur gear area to the rear hub, and influences chain alignment and slack. When replacing a worn sprocket, inspect the chain and rear hub for wear and ensure proper alignment to prevent premature engagement issues.

Installation is straightforward for users familiar with Promoto-MX maintenance: remove the rear wheel assembly, replace the sprocket on the hub using existing fastening hardware, then verify chain tension and lateral alignment. No vehicle tools or real-vehicle implications are discussed; keep work limited to the RC scale motorcycle.

Choose this medium carbon steel sprocket when you need a direct-fit replacement for the listed LOSI Promoto-MX models and want a durable option for regular drivetrain maintenance and setup tuning.