Vortex 610BZK-42 Aluminum Rear Sprocket 520 Pitch 42-Tooth Black

The Vortex 610BZK-42 is a 42-tooth, 520-pitch aluminum rear sprocket finished in a striking black anodize with contrast-machined accents. Engineered for sport and performance motorcycle applications, this sprocket delivers the precision and reliability that Vortex Racing is known for on both the street and track.

Key Features:

• 100% CNC manufactured in the USA from a specially formulated aluminum alloy per Vortex specifications
• Black anodized finish with machined accent highlights for a premium appearance and corrosion resistance
• Lightening holes reduce rotating mass for improved throttle response and acceleration
• Precision tooth geometry — Vortex's patented tooth design promotes even chain wear and increases sprocket longevity
• 520 chain pitch compatibility
• 42 teeth — suited for riders seeking strong low-to-mid range drive performance

Vortex rear sprockets are machined to exacting tolerances to ensure perfect concentricity, smooth power delivery, and long service life. Whether used as a direct OEM replacement or as part of a gearing change, the 610BZK-42 is a proven upgrade for serious street and track riders.