Vortex 821-51 CAT5 Aluminum Rear Sprocket 51-Tooth 520 Pitch Silver

The Vortex 821-51 is a 51-tooth, 520-pitch CAT5 aluminum rear sprocket engineered for sport bike and road racing applications. Precision-manufactured in the USA, this sprocket delivers the tight tolerances and long-lasting performance that Vortex Racing is known for worldwide.

Vortex's CAT5 anodizing process gives the sprocket a bright, corrosion-resistant silver finish while the unique saber tooth groove design and patented tooth profile help extend sprocket life under hard use. Drilled lightening holes reduce rotating mass for improved throttle response and acceleration.

Key Features:

• 51-tooth rear sprocket for tuned acceleration and gear ratio adjustment
• 520 chain pitch compatibility
• 100% CNC machined in the USA to precise tolerances
• CAT5 silver anodized finish for corrosion resistance and durability
• Specially formulated aluminum alloy per Vortex specifications
• Patented unique tooth design increases sprocket longevity
• Drilled lightening holes to reduce rotating mass

Vortex rear sprockets are a trusted choice for racers competing in AMA Superbike, Supercross, and road racing, as well as performance street riders looking to optimize their drivetrain gearing.