Vortex 642AZB-39 Aluminum Rear Sprocket 39T Black Anodized 530 Pitch

The Vortex 642AZB-39 is a 39-tooth, 530-pitch black anodized aluminum rear sprocket designed for performance motorcycle applications. Manufactured 100% in the USA, this sprocket is CNC-machined from a specially formulated aluminum alloy to deliver an ideal balance of lightweight construction and long-lasting durability.

Vortex's proprietary tooth geometry and patented sprocket design reduce chain wear while maximizing power transfer efficiency. The black anodized finish provides corrosion resistance and a clean, aggressive look. Reducing rotating mass at the rear wheel with an aluminum sprocket versus a heavier steel unit translates to improved throttle response and more usable power to the ground.

Key Features:

• 39 teeth — allows precise gear ratio tuning for acceleration or top speed
• 530 chain pitch — fits standard 530-pitch drive chains
• Black anodized aluminum construction — lightweight and corrosion-resistant
• 100% CNC manufactured in the USA to tight tolerances
• Vortex patented tooth design for increased sprocket longevity and reduced chain wear
• Reduces rotating mass compared to OEM steel sprockets
• Precision machined for concentricity, ensuring smooth, quiet operation

The Vortex 642AZB-39 rear sprocket is a direct-fit upgrade for riders looking to optimize their drivetrain gearing without sacrificing reliability. Compatible with standard 530-pitch chains.