Vortex 604ZK-39 Black Aluminum Rear Sprocket 39-Tooth

The Vortex 604ZK-39 is a 39-tooth black anodized aluminum rear sprocket engineered for performance motorcycle applications. Built to Vortex's exacting standards, this sprocket delivers a lightweight, race-proven alternative to stock steel sprockets without sacrificing durability.

Key Features:

• 39-Tooth rear sprocket for precise gearing tuning
• Lightweight aluminum construction reduces rotating mass and improves throttle response
• Black anodized finish provides corrosion resistance and a clean, aggressive appearance
• 100% CNC machined in the USA to precise tolerances for concentricity and quiet operation
• Vortex patented tooth design increases sprocket longevity and chain engagement
• Part of the 604 series — designed to match specific hub bolt patterns and chain pitch

The Vortex 604ZK-39 is an ideal upgrade for riders looking to fine-tune their gearing ratio for quicker acceleration or optimized performance. As with any sprocket replacement, it is recommended to replace the chain and front sprocket simultaneously for even wear and maximum drivetrain life.