Vortex 491A-51 Silver 51-Tooth 520-Pitch Aluminum Rear Sprocket

The Vortex 491A-51 is a 51-tooth, 520-pitch aluminum rear sprocket engineered for serious motorcycle riders and racers. Manufactured in the USA, this sprocket is precision-machined from 7075 T6 billet aluminum to exacting tolerances, delivering the perfect balance of lightweight performance and long-lasting durability.

Key Features:

• 51-tooth, 520-pitch rear sprocket for precise gearing adjustments
• Constructed from 7075 T6 billet aluminum for maximum strength-to-weight ratio
• 100% CNC machined in the USA to tight tolerances for superior concentricity
• Patented saber tooth groove design increases sprocket longevity and chain engagement
• Lightening holes reduce rotating mass for improved throttle response
• Silver anodized finish resists corrosion and debris buildup
• Specially formulated alloy per Vortex specifications

The 491A-51 is a direct-fit replacement rear sprocket designed to work with standard 520-pitch chains. The higher tooth count makes it ideal for riders seeking stronger low-end acceleration and quicker off-the-line response. Vortex Racing sprockets are trusted by professional race teams worldwide and are a proven upgrade over OEM sprockets for both street and track use.