Vortex 165ZK-56 56-Tooth Aluminum Rear Sprocket

The Vortex 165ZK-56 is a 56-tooth aluminum rear sprocket engineered for high-performance motorcycle applications. Built to Vortex Racing's exacting standards, this sprocket delivers a lightweight, precision-fit upgrade over heavy OEM steel sprockets, helping reduce rotational mass for improved throttle response and acceleration.

Key Features:

• 56-Tooth Rear Sprocket — suited for gearing adjustments that favor low-end torque and faster acceleration
• Lightweight Aluminum Construction — CNC machined from a specially formulated alloy per Vortex specifications for optimal strength-to-weight ratio
• 100% CNC Manufactured in the USA — precision machined to tight tolerances ensuring a perfectly concentric sprocket and smooth power delivery
• Induction Hardened — heat treatment process increases tooth surface hardness for extended wear life
• Vortex Patented Tooth Design — unique tooth profile reduces chain wear and increases overall sprocket longevity
• Black Anodized Finish — corrosion-resistant finish provides durability and a clean, aggressive appearance
• Lightening Holes — strategically placed cutouts further reduce rotating mass without sacrificing structural integrity

The Vortex 165ZK-56 rear sprocket is a direct bolt-on performance upgrade, offering a measurable reduction in drivetrain weight compared to stock components. It is compatible with the matching chain pitch for the 165 series application and pairs seamlessly with Vortex front sprockets and premium X-ring chains for a complete drivetrain overhaul.