Vortex 491AK-45 Black 45-Tooth 520-Pitch Aluminum Rear Sprocket

The Vortex 491AK-45 is a 45-tooth, 520-pitch aluminum rear sprocket finished in an anodized black (AK) coating. Engineered for performance street and track riders, this sprocket is part of Vortex's well-regarded CAT5 aluminum sprocket line — 100% CNC machined in the USA to tight tolerances for precise fitment and consistent power transfer.

Key Features:

• 45-Tooth, 520-Pitch rear sprocket for optimized gear ratio tuning
• Anodized black finish for a clean, aggressive look and added corrosion resistance
• Lightweight aluminum construction reduces rotating mass for improved throttle response and acceleration
• 100% CNC machined in the United States to precise tolerances
• Patented Vortex tooth design with saber tooth grooves for increased sprocket longevity
• Specially formulated alloy per Vortex specifications for durability under demanding conditions

The Vortex 491AK-45 rear sprocket is a popular upgrade over OEM units for riders looking to fine-tune their gear ratios for improved acceleration, reduced rotating weight, or a sharper throttle feel. The 520-pitch chain compatibility makes it well-suited for converted or lightweight chain drive setups.