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 vtx317ZKV4-45. 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


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


• Black finish provides a clean, performance-oriented appearance


• Manufactured in the USA

The Vortex Racing V4 sprocket is engineered for dependable chain engagement and consistent operation under demanding riding conditions. Its precision-machined construction helps maintain accurate alignment and smooth power delivery, while the reduced weight contributes to lower unsprung and rotating mass. The 45-tooth configuration is designed for use with a 520 chain system and is a practical choice for riders seeking responsive performance without sacrificing durability.
This rear sprocket fits select KTM motorcycles, including the 2015–2019 KTM 390 Duke, the 2015–2019 KTM RC 390, and the 2020 KTM 390 Adventure. Verify your motorcycle’s year, model, chain size, tooth count, and drivetrain specifications before installation. Professional installation is recommended to ensure correct sprocket alignment, chain tension, and fastener torque.

Features:

• 45-tooth rear sprocket for 520 chain systems

• Precision-machined 7075-T6 aluminum construction

• 10–15% lighter than the Vortex CAT5 design

• Reduced rotating mass for improved acceleration and handling response

• Excellent concentricity for smooth, quiet operation

• Black finish

• Manufactured in the USA

• Fits select 2015–2020 KTM 390 Duke, RC 390, and 390 Adventure models

Fitment:
KTM 390 Adventure Base 2020
KTM 390 Adventure Base 2021
KTM 390 Adventure Base 2022
KTM 390 Adventure Base 2024
KTM 390 Duke Base 2015
KTM 390 Duke Base 2016
KTM 390 Duke Base 2017
KTM 390 Duke Base 2018
KTM 390 Duke Base 2019
KTM 390 Duke Base 2020
KTM 390 Duke Base 2021
KTM 390 Duke Base 2022
KTM 390 Duke Base 2023
KTM 390 Duke Base 2024
KTM RC 390 Base 2015
KTM RC 390 Base 2016
KTM RC 390 Base 2017
KTM RC 390 Base 2018