Vortex Racing V4 45 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 45-tooth 520 rear sprocket, part number vtx642AZKV4-45. 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 dependable performance


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


• Manufactured in the USA

This black Vortex Racing V4 sprocket uses a 520 chain size and a 45-tooth configuration for reliable fitment and consistent drivetrain operation. Its precision construction helps maintain accurate chain engagement while the reduced weight minimizes unsprung and rotating mass at the rear wheel. The sprocket is suitable for riders seeking responsive performance without sacrificing the smooth operation expected from a high-quality replacement component.
The Vortex Racing vtx642AZKV4-45 fits select Yamaha motorcycles, including the 2021–2024 MT-09, 2021–2024 MT-09 SP, and 2022–2024 XSR900, as listed below. Confirm the motorcycle year, model, chain size, tooth count, and mounting specifications before installation. Professional installation is recommended to ensure correct alignment, chain tension, and torque settings.

Features:

• Brand: Vortex Racing

• Part Number: vtx642AZKV4-45

• Sprocket Series: V4

• Tooth Count: 45 teeth

• Chain Size: 520

• Material: Precision-machined 7075-T6 aluminum

• Finish: Black

• Weight Advantage: 10–15% lighter than CAT5

• Manufacturing: Made in the USA

• Fitment: 2021–2024 Yamaha MT-09

• Fitment: 2021–2024 Yamaha MT-09

SP

• Fitment: 2022–2024 Yamaha XSR900

Fitment:
Yamaha MT-09 Base 2018
Yamaha MT-09 Base 2021
Yamaha MT-09 Base 2022
Yamaha MT-09 Base 2023
Yamaha MT-09 Base 2024
Yamaha MT-09 Base 2025
Yamaha MT-09 Base 2026
Yamaha MT-09 SP Base 2021
Yamaha MT-09 SP Base 2022
Yamaha MT-09 SP Base 2023
Yamaha MT-09 SP Base 2024
Yamaha MT-09 SP Base 2025
Yamaha MT-09 SP Base 2026
Yamaha XSR900 Base 2016
Yamaha XSR900 Base 2017
Yamaha XSR900 Base 2018
Yamaha XSR900 Base 2022
Yamaha XSR900 Base 2023
Yamaha XSR900 Base 2024
Yamaha XSR900 Base 2025
Yamaha XSR900 Base 2026