Vortex 253ZK-42 CAT5 520-Pitch 42-Tooth Black Aluminum Rear Sprocket

The Vortex 253ZK-42 is a 42-tooth, 520-pitch CAT5 aluminum rear sprocket designed for performance street and racing motorcycles. Built by Vortex Racing—a U.S.-based manufacturer with a long reputation in Motocross, Supercross, and Road Racing—this sprocket delivers a winning combination of lightweight construction and proven durability.

Key Features:

• 42-Tooth / 520 Pitch: Direct-fit replacement or performance upgrade for 520-pitch chain drive systems
• CAT5 Aluminum Construction: Specially formulated lightweight aluminum alloy per Vortex specifications, reducing rotating mass for improved acceleration and throttle response
• Black Anodized Finish: Cat 5 anodized black finish provides corrosion resistance and a clean, aggressive look
• Patented Tooth Design: Vortex's unique saber-tooth groove geometry extends sprocket longevity and ensures smooth, consistent chain engagement
• 100% CNC Machined in the USA: Manufactured to tight tolerances for precision fitment and consistent performance
• Weight-Reducing Design: Cupped profile and precision cutouts minimize rotational mass without sacrificing structural integrity

The Vortex 253ZK-42 rear sprocket is an ideal upgrade for riders seeking to fine-tune their gear ratio, reduce drivetrain weight, or replace a worn OEM sprocket with a race-proven alternative. Always verify chain pitch and bolt pattern compatibility with your specific motorcycle before ordering.