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Vortex Racing V4 44 Tooth 520 Rear Sprocket - Black

The next generation of Vortex aluminum rear sprockets, V4 builds on the long-running CAT5 sprocket platform with a lighter, more aggressive design. Reduced rotating mass improves acceleration, throttle response, handling, and overallagility. Ideal for street, track, and performance applications.
  • Excellent concentricity for smooth, quiet operation and efficient power transfer
  • Precision-machined from high-strength 7075-T6 aluminum
  • 10-15% Lighter than CAT5
  • Manufactured in the USA

Upgrade your motorcycle’s drivetrain with the Vortex Racing V4 44-tooth 520 rear sprocket, part vtx840AZKV4-44. Designed as the next generation of Vortex aluminum rear sprockets, the V4 builds on the proven CAT5 platform with a lighter, more aggressive profile. Its reduced rotating mass can help improve acceleration, throttle response, handling, and overall agility for street riding, track use, and other performance applications.


  • Excellent concentricity promotes smooth, quiet operation and efficient power transfer

  • Precision-machined from high-strength 7075-T6 aluminum for dependable performance

  • 10–15% lighter than the previous CAT5 design to help reduce unsprung and rotating weight

  • Black finish provides a clean, performance-focused appearance

  • Manufactured in the USA to support consistent quality and fit


The Vortex Racing V4 sprocket is engineered for riders who want responsive drivetrain performance without adding unnecessary weight. Precision machining helps maintain accurate tooth geometry and concentricity, supporting smooth chain engagement and consistent power delivery. The 44-tooth configuration is intended for compatible 520 chain applications and should be matched to the motorcycle’s existing gearing, chain size, and fitment requirements before installation.
Install the Vortex Racing V4 rear sprocket using the motorcycle manufacturer’s recommended procedures and torque specifications. Inspect the chain, front sprocket, and related drivetrain components for wear before installation, since replacing worn parts together helps promote reliable operation. Confirm vehicle compatibility and gearing requirements to ensure proper fitment for your application.

Features:

  • 44-tooth rear sprocket for compatible 520 chain applications
  • 7075-T6 aluminum construction for high strength and reduced weight
  • 10–15% lighter than the Vortex CAT5 design
  • Precision-machined for excellent concentricity and smooth operation
  • Reduced rotating mass can improve acceleration, throttle response, handling, and agility
  • Black finish for a clean, performance-oriented appearance
  • Manufactured in the USA