Vortex 839AZRV4-45 VTX Aluminum Rear Sprocket 45-Tooth Silver Anodized V4

The Vortex 839AZRV4-45 is a 45-tooth, silver anodized aluminum rear sprocket built on Vortex's next-generation V4 design platform. Engineered for riders who demand race-proven drivetrain performance, this sprocket delivers a significant weight reduction over the classic CAT5 design while maintaining full structural integrity.

Key Features:

• V4 Design: Features an updated machined pattern with faces machined on both sides, achieving a 10–15% weight reduction compared to the standard CAT5 sprocket without sacrificing strength
• CNC Manufactured in the USA: 100% CNC machined to precise tolerances for consistent fitment and performance
• Specially Formulated Alloy: Made from a proprietary aluminum alloy developed to Vortex's exact specifications for an optimal balance of weight and durability
• Silver Anodized Finish: Hard anodized coating protects against corrosion and wear, extending service life
• Vortex Patented Tooth Design: Unique tooth profile engineered to reduce wear and increase sprocket longevity
• 45-Tooth Rear Sprocket: Provides increased low-end torque and improved acceleration compared to lower tooth counts

The 839AZRV4-45 is part of Vortex Racing's V4 sprocket series — an evolution of the iconic CAT5 — designed for street riders and racers seeking maximum performance with minimal rotating mass.