Vortex 610ZK-50 520-Pitch 50-Tooth Black Aluminum Rear Sprocket

The Vortex 610ZK-50 is a 520-pitch, 50-tooth black anodized aluminum rear sprocket designed as a high-performance upgrade over stock steel sprockets. Manufactured 100% in the USA using a specially formulated aluminum alloy to Vortex's proprietary specifications, this sprocket delivers a significant reduction in rotating mass for improved throttle response and drivetrain efficiency.

Key Features:

• Chain Pitch: 520
• Tooth Count: 50 teeth
• Finish: Black anodized (ZK designation)
• Material: Lightweight CAT5 aluminum — specially formulated alloy per Vortex specifications
• 100% CNC machined in the USA for precise concentricity and consistent fitment
• Unique patented tooth profile increases sprocket longevity and reduces chain wear
• Lightening holes reduce overall rotating mass for quicker acceleration
• Hard-coat anodized finish resists corrosion and abrasion

Vortex rear sprockets are a proven choice for both street and track riders looking to fine-tune their gearing ratio. A higher tooth count rear sprocket like the 50-tooth 610ZK-50 provides stronger low-end acceleration and improved torque feel compared to lower tooth count options. Replacing your sprocket as part of a full chain and sprocket service is recommended for optimal drivetrain longevity.