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 drivetrain with the Vortex Racing V4 43-tooth 520 rear sprocket, part number vtx144AZKV4-43. Designed as the next generation of Vortex aluminum rear sprockets, the V4 builds on the proven CAT5 platform with a lighter, more aggressive profile. Reduced rotating mass can help improve acceleration, throttle response, handling, and overall agility for street riding, track use, and other performance applications.

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


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


• 10-15% lighter than the Vortex CAT5 sprocket design


• Black finish provides a clean, performance-oriented appearance


• Manufactured in the USA

This Vortex Racing V4 rear sprocket is engineered for riders who want responsive drivetrain performance without unnecessary rotating weight. Its precision construction helps maintain consistent chain alignment and smooth operation, while the 43-tooth gearing configuration delivers a performance-focused replacement option for compatible motorcycles. The 520 chain size is suitable for the listed Aprilia applications and should be matched with the motorcycle’s existing drivetrain components and gearing requirements.
Compatible applications include the 2021-2024 Aprilia RS 660, 2021-2023 Aprilia Tuono 660, 2022 Aprilia Tuono 660 Factory, and 2023 Aprilia RS 660 Extrema. Verify motorcycle year, model, chain size, sprocket configuration, and installation requirements before ordering. Professional installation is recommended to ensure correct fitment, chain alignment, and fastener torque.

Features:

• 43-tooth rear sprocket with 520 chain compatibility

• Precision-machined 7075-T6 aluminum construction

• 10-15% lighter than the Vortex CAT5 design

• Reduced rotating mass for improved acceleration and throttle response

• Excellent concentricity for smooth, quiet operation

• Black finish

• Manufactured in the USA

• Fits select 2021-2024 Aprilia RS 660 and 2021-2023 Aprilia Tuono 660 models

Fitment:
Aprilia RS 660 Base 2021
Aprilia RS 660 Base 2022
Aprilia RS 660 Base 2023
Aprilia RS 660 Base 2024
Aprilia RS 660 Base 2025
Aprilia RS 660 Extrema Base 2023
Aprilia RS 660 Extrema Base 2024
Aprilia RS 660 Factory Base 2025
Aprilia Tuono 660 Base 2021
Aprilia Tuono 660 Base 2022
Aprilia Tuono 660 Base 2023
Aprilia Tuono 660 Base 2024
Aprilia Tuono 660 Factory Base 2022
Aprilia Tuono 660 Factory Base 2023
Aprilia Tuono 660 Factory Base 2024
Aprilia Tuono 660 Factory Base 2025