Vortex 337CZK-38 CAT5 520 Aluminum Rear Sprocket 38-Tooth Black

The Vortex 337CZK-38 is a 38-tooth, 520-pitch CAT5 aluminum rear sprocket finished in a black anodized coating. Designed as a performance-oriented replacement for OEM steel sprockets, it delivers a meaningful weight reduction without sacrificing durability or drivetrain efficiency.

Key Features:

• CAT5 Aerospace-Grade Aluminum — machined from a specially formulated aluminum alloy per Vortex specifications, significantly lighter than stock steel sprockets
• 100% CNC Machined in the U.S.A. — manufactured to precise tolerances for concentricity and consistent chain engagement
• Black Anodized Finish — durable anodized coating provides corrosion resistance and a clean, aggressive appearance
• Unique Vortex Tooth Design — proprietary tooth geometry promotes smooth chain engagement and extends sprocket service life
• 520 Chain Pitch — compatible with standard 520-pitch chain and sprocket setups, including OEM replacements and 520 conversion applications
• 38 Teeth — stock or near-stock gearing ratio option for riders seeking reliable everyday performance or a baseline for gearing comparisons

Vortex Racing is a U.S.-based manufacturer with over 15 years of experience producing race-proven drivetrain components for motocross, supercross, road racing, and flat track applications. The 337CZK-38 is part of their trusted CAT5 rear sprocket lineup, used by professional race teams and street riders alike.