Vortex 840ZK-39 Rear Sprocket 39 Tooth Chain & Sprocket Kit

The Vortex 840ZK-39 is a lightweight aluminum racing sprocket that is 100% CNC manufactured in the USA from specially formulated alloy per Vortex specifications. This 39-tooth rear sprocket features silver anodizing to prevent corrosion and a unique tooth design that increases sprocket longevity.

Key Features:

• Sprocket dimensions: 5 bolt pattern with 10mm holes, 100mm PCD (Pitch Circle Diameter), and 76mm sprocket ID
• CNC machined from aerospace-grade aluminum for optimal strength and reduced rotational mass
• Vortex patented tooth design for extended service life
• Compatible with BST wheels and other aftermarket wheel applications
• Part of the 840 series designed for high-performance racing applications

Based in the USA, Vortex has been manufacturing top quality racing components since 1995. The ZK designation indicates this sprocket is typically packaged as part of a complete chain and sprocket kit, providing a matched drivetrain solution for maximum performance and longevity.