Vortex 491AZB-37 Aluminum Rear Sprocket Black 37-Tooth

The Vortex 491AZB-37 is a lightweight, 37-tooth aluminum rear sprocket finished in a hard-coat black anodize. Designed for performance street and track riders who want to reduce rotating mass without sacrificing durability, this sprocket is precision CNC machined in the USA from a specially formulated 7075 aluminum alloy to Vortex's exacting tolerances.

Vortex's distinctive manufacturing process anodizes the sprocket first, then CNC machines the accent cuts — resulting in a striking black body with contrasting silver highlights. The patented saber-tooth groove design sets Vortex apart from conventional sprockets, promoting longer service life by reducing chain wear and improving chain engagement.

Key Features:

• 37 teeth — bolt-on gearing option for fine-tuning acceleration and top-speed balance
• Black hard-coat anodized finish — enhanced corrosion resistance and longer cosmetic life
• 7075 aluminum construction — high-strength, lightweight alloy reduces rotating mass
• 100% CNC machined in the USA — tight tolerances ensure concentricity and smooth chain engagement
• Patented saber-tooth groove design — unique tooth profile increases sprocket longevity
• Anodized before machining — produces signature silver accent highlights on a black body

The Vortex 491AZB-37 is a direct-fit, performance upgrade rear sprocket trusted by racers and enthusiasts alike. Pair with a matching Vortex front sprocket and a new chain for best results and even wear across the drivetrain.