Vortex 920ZK-40 VTX Aluminum Rear Sprocket 40T Black

The Vortex 920ZK-40 is a 40-tooth aluminum rear sprocket from Vortex Racing's VTX series, engineered for sport and performance motorcycle applications. Featuring a black anodized finish, this sprocket delivers a combination of durability, corrosion resistance, and aggressive styling straight out of the box.

Key Features:

• 40-tooth rear sprocket for precise gearing options
• Black anodized finish — bonds to the aluminum for enhanced corrosion resistance and a clean appearance
• Manufactured from aerospace-grade billet aluminum alloy per Vortex specifications for exceptional strength-to-weight ratio
• 100% CNC machined in the USA to tight tolerances
• Lightweight construction reduces rotating mass compared to OEM steel sprockets, improving acceleration and handling response
• Unique tooth geometry engineered to maximize sprocket longevity and chain engagement
• Silver anodized variants available — this ZK variant features the black hardcoat finish

Vortex Racing rear aluminum sprockets are a top choice for street riders and racers alike. The reduced rotating mass of an aluminum sprocket versus a stock steel unit translates directly into improved throttle response, quicker acceleration, and more precise deceleration. Vortex sprockets are manufactured in the United States and are held to strict quality standards used on professional race bikes.