Vortex 170ZU-39 Aluminum Rear Sprocket 39-Tooth 520 Pitch

The Vortex 170ZU-39 is a lightweight CNC-machined aluminum rear sprocket designed for performance motorcycle applications. With a 39-tooth configuration and 520 pitch chain compatibility, this sprocket delivers a direct upgrade over heavier OEM steel units, reducing rotating mass for improved acceleration response and overall handling.

Key Features:

• 39-Tooth / 520 Pitch — drop-in fitment for bikes running a 520-pitch chain setup
• Aerospace-grade aluminum construction — significantly lighter than stock steel sprockets for reduced unsprung and rotating weight
• CNC-machined precision — tight tolerances ensure smooth chain engagement and consistent performance
• Hard anodized finish — resists corrosion and wear for extended service life
• Made in the USA — manufactured by Vortex Racing to meet the demands of both street and track use

The Vortex 170ZU-39 is ideal for riders looking to optimize gearing, reduce drivetrain weight, and improve throttle response. As a direct replacement sprocket, installation is straightforward using standard hand tools.