Vortex 617ZK-37 Black Aluminum Rear Sprocket 37-Tooth

The Vortex 617ZK-37 is a 37-tooth black anodized aluminum rear sprocket engineered for performance motorcycle applications. Vortex sprockets are a trusted choice among street and track riders seeking a high-quality OEM replacement or gearing upgrade.

Constructed from lightweight 7075-T6 aluminum, this sprocket delivers a significant weight reduction over steel alternatives, helping reduce rotational mass for improved throttle response and acceleration. The black anodized finish provides a clean, aggressive look while offering corrosion resistance.

Key Features:

• 37-tooth rear sprocket for precise final drive gearing adjustment
• CNC-machined from 7075-T6 aluminum for strength and lightweight performance
• Black anodized finish (ZK designation) for corrosion resistance and aesthetics
• Vortex patented unique tooth design for increased sprocket longevity
• Direct OEM-style fitment — no modifications required
• Compatible with standard sprocket pitch for the intended application

Changing to a 37-tooth rear sprocket allows riders to fine-tune their bike's final gear ratio — whether optimizing for quicker acceleration or matching a specific power band. The Vortex 617ZK-37 is an ideal upgrade for riders looking to improve performance without sacrificing reliability.