Vortex 840AZO-50 Aluminum Rear Sprocket for BST Wheels Sprockets - 50T

The Vortex 840AZO-50 is a precision-engineered aluminum rear sprocket designed specifically for BST (Black Stone Tek) aftermarket wheels. This 50-tooth sprocket delivers the perfect balance of lightweight performance and durability for high-performance sportbikes equipped with premium BST wheel upgrades.

Key Features:

• 50-tooth configuration for optimized gearing
• 100% CNC machined from aerospace-grade aluminum for maximum strength-to-weight ratio
• Specially formulated alloy per Vortex specifications ensures exceptional durability
• Anodized finish prevents corrosion and provides long-lasting appearance
• Patented Vortex tooth design increases sprocket longevity and promotes ideal chain engagement
• Designed for BST wheel bolt pattern: 5 bolt holes (10mm) with 100mm PCD and 76mm center bore
• Manufactured in the USA by Vortex Racing since 1995

This sprocket features Vortex's unique tooth profile that optimizes chain hold and release, reducing wear on both the sprocket and chain while ensuring smooth power transfer. The lightweight aluminum construction reduces unsprung and rotational mass, improving acceleration, braking response, and overall handling dynamics—critical advantages for track riding and spirited street use.