Vortex 671ZK-42 Black 42-Tooth Aluminum Rear Sprocket

The Vortex 671ZK-42 is a 42-tooth, black anodized aluminum rear sprocket engineered for high-performance motorcycle applications. Manufactured 100% in the USA, this sprocket is CNC-machined from a specially formulated aluminum alloy per Vortex specifications, delivering an ideal balance of lightweight performance and long-lasting durability.

Key Features:

• 42-Tooth Rear Sprocket — precise tooth count for optimized gear ratio tuning
• Black Anodized Finish — corrosion-resistant anodizing with contrasting silver machined accents
• Lightweight Aluminum Construction — reduces rotating mass for improved throttle response and acceleration
• 100% CNC Manufactured in the USA — machined to the tightest tolerances for concentricity and consistent fit
• Vortex Patented Tooth Design — saber-tooth groove geometry engineered for extended sprocket life and smooth chain engagement and release
• Specially Formulated Alloy — proprietary aluminum blend developed to Vortex's exacting performance standards

Vortex Racing has been producing championship-proven drivetrain components since 1995. Their rear sprockets are a popular upgrade over OEM units, offering reduced weight and the ability to fine-tune gearing for improved low-end torque or top-end speed. The 671ZK-42 is part of Vortex's trusted line of performance rear sprockets used by professional race teams worldwide.