SUPERSPROX Countershaft Sprocket - 12 Tooth CST-1901-12-1

If you're running a countershaft sprocket that's wearing down or losing power to friction, you're leaving performance on the table. The SUPERSPROX 12-tooth countershaft sprocket delivers the durability and efficiency of factory racing parts without the factory price tag. Built from SCM-435 carbon-free steel with an ultra-hard surface layer, this sprocket resists wear while reducing chain drag that kills horsepower.

Whether you're racing off-road or pushing hard on the street, the grooved tooth design keeps dirt and debris from building up, maintaining consistent engagement with your chain. The radial lightening holes cut unsprung weight without compromising strength, giving you faster acceleration and reduced rotational mass. This is the same specification trusted by factory racing teams—proven durability in the most demanding conditions.

• Material: SCM-435 carbon-free steel
• Tooth Count: 12T
• Surface Hardness: Ultra-hard coating
• Coating Thickness: 0.5mm
• Design: Radial lightened
• Tooth Profile: Grooved (dirt removal)
• Application: Off-road & street
• Fitment: Countershaft (vehicle-specific verification required)
• MPN: CST-1901-12-1
• Installation: Bolt-on replacement