Vortex 313ZK-51 Black Aluminum Rear Sprocket 51-Tooth 520-Pitch

The Vortex 313ZK-51 is a 51-tooth, 520-pitch black anodized aluminum rear sprocket engineered for KTM off-road motorcycles including the 60 SX, 65 SX, and 65 XC. Manufactured in the USA by Vortex Racing, this sprocket delivers the precision and durability demanded by competitive riders on and off the track.

Vortex Racing's aluminum sprockets are CNC-machined to exacting tolerances and hard anodized for lasting corrosion resistance and color retention. The lightweight aluminum construction reduces rotating mass compared to steel, helping free up horsepower and improve throttle response. The black anodized finish (ZK series) provides an aggressive, race-ready appearance while adding a protective layer against the elements.

Key Features:

• 51 teeth – ideal for increasing low-end torque and acceleration
• 520 pitch – compatible with standard 520 chain systems
• Black anodized aluminum – lightweight with corrosion-resistant finish
• CNC machined – manufactured to tight tolerances for precise fit and long chain life
• Made in the USA – Vortex Racing quality, trusted by professional race teams worldwide
• Manufacturer Part Number: 313ZK-51

The Vortex 313ZK-51 rear sprocket is a direct-fit upgrade or replacement for KTM small-bore off-road models, delivering race-proven performance from one of the most respected names in motorcycle drivetrain components.