SUPERSPROX Countershaft Sprocket - 12-Tooth CST-1590-12-1

A worn or undersized countershaft sprocket limits your engine's ability to deliver power efficiently to the chain, causing energy loss and premature drivetrain wear. The SUPERSPROX 12-Tooth Countershaft Sprocket eliminates these problems with factory-grade engineering and materials that professional racing teams depend on, giving you the durability and precision needed for consistent performance whether you're on the track or trail.

This sprocket is built from SCM-435 carbon-free steel with an impregnated core that eliminates breaking risk while the ultra-hard surface layer reduces friction and chain drag. The radial lightening holes cut rotational mass without compromising structural integrity, while grooved teeth designed for off-road use shed dirt and debris instantly—keeping your drivetrain cleaner and running longer.

• Material: SCM-435 carbon-free steel
• Tooth count: 12-tooth
• Surface treatment: Ultra-hard impregnated layer
• Surface depth: 0.5mm hardened layer
• Design: Radial lightened construction
• Teeth profile: Grooved for debris removal
• Friction reduction: Minimizes chain drag
• Applications: Off-road and street
• Specification: Factory racing team-grade
• Fitment: Vehicle-specific (verify fitment)
• Installation: Bolt-on replacement
• MPN: CST-1590-12-1