Vortex 839AZK-51 Aluminum Rear Sprocket 51T

The Vortex 839AZK-51 is a high-performance 51-tooth aluminum rear sprocket engineered for riders seeking a lightweight, durable alternative to OEM steel sprockets. Machined from 7075-T6 billet aluminum and hard anodized for corrosion resistance, this sprocket delivers excellent power transfer and reduced rotating mass for improved throttle response.

Key Features:

• 51 teeth — optimized gearing for acceleration-focused riding
• Machined from 7075-T6 billet aluminum for a premium strength-to-weight ratio
• Hard anodized finish for enhanced corrosion and wear resistance
• Precision CNC machined for exact fitment and smooth chain engagement
• Significant weight savings over OEM steel rear sprockets
• Matches Vortex 839 bolt pattern / carrier configuration

Vortex sprockets are manufactured to strict tolerances and are a favorite among both track-day enthusiasts and street riders looking to fine-tune their gearing. The AZK series offers a balance of lightweight performance and long service life when properly maintained with quality chain lube.