Vortex 177ZK-40 520 Rear Sprocket 40-Tooth Black Anodized Aluminum

The Vortex 177ZK-40 is a 40-tooth, 520-pitch rear sprocket machined from high-grade aluminum alloy and finished in a black anodized coating. Engineered for performance street and track riders, this sprocket delivers precise power transfer and reduced rotating mass compared to heavier steel alternatives.

Key Features:

• 40 Teeth — optimized tooth count for balanced acceleration and top-end performance
• 520 Pitch — compatible with standard 520-series drive chains
• Lightweight aluminum construction — reduces rotating mass for improved throttle response and acceleration
• Black anodized finish — corrosion-resistant coating for long-lasting appearance and durability
• 100% CNC manufactured in the USA — machined to tight tolerances for precise fitment and concentricity
• Unique tooth profile — Vortex-engineered tooth geometry extends sprocket service life
• Specially formulated alloy — material selected per Vortex Racing specifications for optimal strength-to-weight ratio

Vortex Racing has been producing championship-proven drivetrain components for road racing, motocross, supercross, and flat track applications for over 15 years. The 177ZK-40 is a direct-fit replacement or performance upgrade rear sprocket — verify bolt pattern and chain pitch compatibility for your specific motorcycle application.