Vortex 921AZRV4-40 VTX Anodized Aluminum Rear Sprocket 40-Tooth 520

The Vortex 921AZRV4-40 is a 40-tooth anodized aluminum rear sprocket built for riders who demand lightweight performance without sacrificing durability. Part of Vortex's VTX aluminum sprocket series, this sprocket is 100% CNC machined in the USA to exacting tolerances, ensuring perfect concentricity and reliable chain engagement.

Key Features:

• 40-Tooth, 520 Chain Pitch — designed for use with 520-pitch drive chains
• 7075-T6 Billet Aluminum Construction — premium aerospace-grade alloy for maximum strength-to-weight ratio
• Anodized Finish — electrically coated surface provides corrosion resistance and enhanced durability
• Lightening Holes — strategically placed cutouts reduce rotating mass for improved throttle response and acceleration
• 100% CNC Machined — precision manufactured in the U.S.A. for consistent quality
• Vortex Patent-Pending Design — saber tooth groove profile for optimized chain engagement and reduced wear
• PTFE Black Hardcoat Option Available — bonds to aluminum for a more durable surface with less friction

Reducing rotating mass with a lightweight aluminum rear sprocket translates directly to improved acceleration, sharper deceleration, and quicker directional changes. The Vortex 921AZRV4-40 is a direct-fit, bolt-on upgrade engineered to OEM mounting specifications for a hassle-free installation.