Vortex 251AZBV4-43 CAT5 Aluminum Rear Sprocket 520 Pitch 43-Tooth Blue

The Vortex 251AZBV4-43 is a lightweight CAT5 aluminum rear drive sprocket featuring a 520 chain pitch and 43-tooth count, finished in a blue anodized coating. Designed for performance street and track riders, this sprocket delivers a meaningful weight reduction over OEM steel sprockets to reduce rotating mass and sharpen throttle response.

Key Features:

• Lightweight CAT5 aluminum construction — specially formulated alloy per Vortex specifications for an optimal strength-to-weight ratio
• 100% CNC machined in the USA — manufactured to tight tolerances for precise chain engagement and consistent performance
• 520 chain pitch — compatible with 520-pitch drive chains for street and 520 conversion applications
• 43 teeth — direct replacement or gearing upgrade option
• Blue anodized finish — electrically coated for corrosion resistance and a clean appearance
• Saber tooth groove design — Vortex patented tooth profile helps clear debris and extends sprocket longevity
• Vortex patent-pending sprocket design — unique geometry developed through direct racing feedback

Vortex Racing is a U.S.-based manufacturer with a long track record in Motocross, Supercross, Road Racing, and Flat Track. Each sprocket is built to racing tolerances and validated through real-world competition use at the professional level.