Vortex 610ZK-40 520 Aluminum Rear Sprocket 40-Tooth Black

The Vortex 610ZK-40 is a 40-tooth, 520-pitch aluminum rear sprocket finished in a striking black anodized coat with contrast-machined accents. Engineered for street and track riders who demand precise power transfer and reduced rotating mass, this sprocket is a direct upgrade over heavy OEM steel units.

Key Features:

• 100% CNC manufactured in the USA from a specially formulated aluminum alloy per Vortex specifications
• Black anodized finish with contrast machined accents for corrosion resistance and aggressive styling
• Vortex patented tooth design for increased sprocket longevity and smooth chain engagement
• Precision lightening holes reduce rotating mass for improved throttle response and acceleration
• 520 chain pitch — compatible with 520-series chains and conversion kits
• 40 teeth — allows fine-tuning of gear ratios for improved low-end torque and acceleration
• Manufactured to precise tolerances ensuring concentricity and long-term durability

Vortex Racing rear sprockets are the choice of champions on both the street and the racetrack. The lightweight aluminum construction delivers meaningful weight savings over steel, while the precision CNC machining ensures a consistent, reliable fit every time. The 610ZK-40 is ideal for riders looking to optimize their gearing setup without sacrificing quality or longevity.