Vortex 642ZK-38 Aluminum Rear Sprocket 38-Tooth Black Anodized

The Vortex 642ZK-38 is a 38-tooth aluminum rear sprocket engineered for performance motorcycle applications. Part of Vortex Racing's industry-leading lineup of CNC-machined sprockets, this unit is purpose-built to deliver a meaningful weight reduction over OEM steel sprockets while maintaining the durability demanded by street and track riders alike.

Key Features:

• 38-Tooth rear sprocket — stock replacement or performance gearing option
• Lightweight aluminum construction — reduces rotating mass for improved throttle response and acceleration
• Black anodized finish — corrosion-resistant protective coating with an aggressive look
• 100% CNC manufactured in the USA — precision machined to tight tolerances for true concentricity
• Specially formulated alloy per Vortex specifications — optimized balance of strength and weight
• Vortex patented unique tooth design — engineered to maximize sprocket longevity and chain engagement
• 642-series carrier pattern — fits applicable sport bike hub and bolt configurations

Vortex Racing sprockets are a trusted choice for riders seeking a direct OEM replacement or a performance upgrade. Reduced rotating mass translates to sharper acceleration and improved overall handling dynamics. The black anodized finish resists corrosion and maintains its appearance under hard use. Always replace the chain and front sprocket together when upgrading rear sprocket components.