Vortex 775ZK-42 Black Aluminum 525 Rear Sprocket 42-Tooth

The Vortex 775ZK-42 is a high-performance 42-tooth, 525-pitch black anodized aluminum rear sprocket engineered for serious street and track riders. Precision CNC-machined from a specially formulated aluminum alloy to Vortex specifications, this sprocket delivers an ideal balance of strength, durability, and weight savings over stock steel sprockets.

Key Features:

• 525 Chain Pitch — designed for 525-series chain applications
• 42 Teeth — stock-equivalent or performance-tuned gearing option depending on application
• Black Anodized Finish — corrosion-resistant anodizing provides long-lasting protection and aggressive styling
• CNC Machined Aluminum Construction — lightweight design reduces rotating mass for improved throttle response and acceleration
• Vortex Patented Tooth Profile — unique tooth geometry promotes extended sprocket and chain life
• 100% USA Manufactured — precision-crafted to tight tolerances for consistent, reliable performance

Replacing a worn or stock rear sprocket with the Vortex 775ZK-42 is a straightforward upgrade that can meaningfully improve drivetrain efficiency. The reduced rotational mass of aluminum versus OEM steel contributes to crisper throttle response and lighter feel through the rev range. Paired with a quality 525 chain and matching front sprocket, this rear sprocket is a trusted choice for both performance street riding and track use.