Vortex 840AZK-37 CAT5 Rear Sprocket 520 Pitch 37T Black Aluminum

The Vortex 840AZK-37 is a lightweight CAT5 aluminum racing sprocket designed for high-performance motorcycles using 520 pitch chain. This 37-tooth rear sprocket features Vortex's patented design with unique CNC-machined tooth profiles that increase sprocket longevity and performance.

Key Features:

• 100% CNC manufactured in the USA from specially formulated aluminum alloy per Vortex specifications
• Black anodized finish prevents corrosion and provides an aggressive, race-inspired appearance
• Unique saber tooth grooves and patented tooth design increases sprocket life
• Lightweight construction reduces rotating mass for improved acceleration and handling
• Designed for aftermarket wheels including Marchesini, BST, and Marvic applications
• 520 pitch chain compatibility with 37 teeth

Vortex CAT5 sprockets deliver the perfect balance of weight savings and durability for track and street use. The precision CNC machining ensures exact tolerances for smooth chain engagement and extended service life.