Vortex 635ZK-40 CAT5 Black 40-Tooth 530-Pitch Aluminum Rear Sprocket

The Vortex 635ZK-40 is a CAT5 series aluminum rear sprocket featuring a 530 pitch chain interface and 40 teeth, finished in a striking black anodized treatment with machined silver highlights. Engineered for performance-focused riders who demand lightweight precision drivetrain components.

Key Features:

• CAT5 Construction: CNC machined from 7075 aluminum — anodized first, then precision machined to reveal signature silver highlights on the teeth and sweeps
• 530 Pitch: Designed for standard 530 chain applications
• 40 Teeth: Allows tuning of final drive ratio for improved acceleration or top speed balance
• Lightweight Design: Reduces rotating mass for improved throttle response and faster acceleration versus steel sprockets
• Unique Tooth Profile: Vortex-patented tooth geometry extends sprocket longevity and promotes smooth chain engagement
• Mud Grooves: Built-in grooves help shed debris and maintain consistent performance
• 100% CNC Manufactured in the USA: Machined to tight tolerances for precise fitment and minimal chain wear
• Black Anodized Finish: Hard anodizing provides corrosion resistance and a durable, race-ready appearance

The Vortex 635ZK-40 is a direct-fit upgrade for riders looking to optimize gearing or replace a worn OEM sprocket with a high-performance alternative. Trusted by racers and street riders alike, Vortex rear sprockets are the benchmark in the powersports industry.