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

The Vortex Racing V4 44-tooth 520 rear sprocket builds on the proven CAT5 platform with a lighter, more aggressive design for powersports performance. Reduced rotating mass can improve acceleration, throttle response, handling, and overall agility, making this sprocket a strong choice for street riding, track use, and other performance applications. The black finish adds a clean, race-inspired appearance to your motorcycle.

• 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 previous CAT5 design to help reduce rotating mass


• Manufactured in the USA to Vortex Racing standards


• 44-tooth configuration for 520 chain applications

Designed for a direct fit on select KTM RC 390 models, the Vortex Racing V4 rear sprocket combines precise manufacturing with weight-conscious performance. Its accurate concentricity helps promote consistent chain engagement and smooth drivetrain operation, while the high-strength aluminum construction provides a balance of durability and reduced weight. The V4 design is intended for riders seeking responsive power delivery and sharper handling without unnecessary rotating mass.
This Vortex Racing part number vtx317ZKV4-44 fits the 2015, 2022, and 2023 KTM RC 390. Verify your motorcycle’s required chain size, gearing specifications, and fitment before installation. Professional installation is recommended, and the chain, front sprocket, and rear sprocket should be inspected together to ensure proper alignment and service condition.

Features:

• 44-tooth rear sprocket for 520 chain applications

• Precision-machined 7075-T6 aluminum construction

• 10–15% lighter than the CAT5 design

• Reduced rotating mass for improved acceleration and throttle response

• Excellent concentricity for smooth, quiet operation

• Efficient power transfer

• Black finish

• Manufactured in the USA

• Fits 2015, 2022, and 2023 KTM RC 390 models

Fitment:
KTM RC 390 Base 2015
KTM RC 390 Base 2022
KTM RC 390 Base 2023