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Vortex Racing V4 43 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 final-drive performance with the Vortex Racing V4 43-tooth 520 rear sprocket in black. Built as the next generation of the proven CAT5 sprocket platform, this V4 model features a lighter, more aggressive design that helps reduce rotating mass. The result is improved acceleration, sharper throttle response, more responsive handling, and enhanced overall agility for street riding, track use, and performance applications. This sprocket is identified by Vortex Racing part number vtx317ZKV4-43 and is designed for compatible 520 chain-drive systems.


  • Excellent concentricity: Promotes smooth, quiet operation and efficient power transfer throughout the drivetrain.

  • High-strength construction: Precision-machined from durable 7075-T6 aluminum for a strong, lightweight performance component.

  • Reduced rotating mass: The V4 design is 10–15% lighter than the previous CAT5 platform, supporting quicker response and improved handling.

  • 43-tooth configuration: Provides a performance-oriented gearing option for compatible motorcycles using a 520 chain.

  • Black finish: Delivers a clean, aggressive appearance that complements a wide range of motorcycle builds.

  • Made in the USA: Manufactured in the United States to Vortex Racing quality standards.


Before installation, confirm chain size, tooth count, fitment, and drivetrain compatibility with your motorcycle manufacturer’s specifications. Proper alignment and installation are essential for smooth operation, long service life, and safe performance. The Vortex Racing V4 rear sprocket is supplied as a single replacement component and is intended for use with compatible 520 chain applications.

Features:

  • Excellent concentricity promotes smooth, quiet operation and efficient power transfer
  • Precision-machined from high-strength 7075-T6 aluminum
  • 10–15% lighter than the Vortex Racing CAT5 sprocket platform
  • 43-tooth design for compatible 520 chain-drive systems
  • Black finish provides an aggressive, streamlined appearance
  • Manufactured in the USA