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

The Vortex 604ZB-39 is a 39-tooth black anodized aluminum rear sprocket engineered for street and track performance. Built to Vortex's exacting standards, this sprocket delivers the ideal balance of lightweight construction and long-term durability that riders and racers demand.

Key Features:

• Lightweight aluminum construction reduces rotating mass for improved throttle response and acceleration
• 100% CNC manufactured in the USA to precise tolerances for a perfect, concentric fit
• Specially formulated alloy developed to Vortex's proprietary specifications for optimal strength-to-weight ratio
• Black anodized finish provides corrosion resistance and a clean, aggressive appearance
• Vortex patented tooth design increases sprocket longevity and is unlike any competing sprocket on the market
• 39-tooth rear sprocket — ideal for fine-tuning gear ratios for improved low-end torque or top-end performance

Vortex rear sprockets are the go-to choice for serious riders looking to upgrade or replace OEM gearing. The 604ZB-39 is part of Vortex's trusted lineup of American-made motorcycle sprockets, compatible with the corresponding 520-pitch chain and appropriate front sprocket combination.