Vortex 642C-66 66-Tooth Aluminum Rear Sprocket Black Anodized

The Vortex 642C-66 is a 66-tooth aluminum rear sprocket engineered for motorcycle riders seeking aggressive gearing ratios for stunt riding, low-speed trail work, or maximum acceleration performance. Part of Vortex's proven aluminum sprocket lineup, the 642C-66 delivers a significant weight reduction over OEM steel sprockets, directly reducing rotating mass for improved throttle response.

Key Features:

• 66-Tooth Configuration: High tooth count for maximum low-end torque and aggressive acceleration gearing
• 7075 T6 Aerospace-Grade Aluminum: Premium aircraft-grade alloy delivers exceptional strength-to-weight ratio
• Black Anodized Finish: Durable anodized coating resists corrosion and provides a clean, race-inspired appearance
• 100% CNC Machined in the USA: Precision-machined to tight tolerances for perfect concentricity and smooth chain engagement
• Patented Tooth Design: Vortex's unique tooth profile reduces friction and extends sprocket and chain service life
• Integrated Mud Grooves: Built-in mud relief channels help keep the drivetrain clean during aggressive riding
• Direct Replacement: Bolt-on fitment designed to replace OEM rear sprockets without modification

The 642C-66 is part of Vortex Racing's comprehensive sprocket family, trusted by professional race teams and enthusiasts across Motocross, Supercross, Road Racing, and Flat Track disciplines. Whether you're building a stunt bike or looking to fine-tune your gear ratio for a specific application, the 642C-66 provides the performance and reliability Vortex is known for.