Vortex 803AZK-40 Aluminum Rear Sprocket Anodized Sprockets - 520 40-Tooth Black

The Vortex 803AZK-40 is a 40-tooth, 520-pitch aluminum rear sprocket finished in an anodized black with machined accent two-tone look. Engineered for performance street and track riders who demand reduced rotating mass without sacrificing durability, this sprocket is a direct upgrade over heavy OEM steel units.

Key Features:

• Lightweight aluminum construction — significantly reduces rotating mass compared to steel sprockets, improving throttle response and acceleration
• 100% CNC manufactured in the USA — precision machined to exacting tolerances for consistent fit and performance
• Specially formulated alloy — proprietary Vortex aluminum specification for optimal strength-to-weight ratio
• Anodized black finish with machined accents — corrosion-resistant coating applied before cutting for the iconic two-tone appearance
• Vortex patented tooth design — unique profile engineered for increased sprocket longevity and smooth chain engagement
• 520 pitch — compatible with all 520-pitch chains and front sprockets
• 40 teeth — stock or performance gearing replacement depending on application

Vortex aluminum sprockets are the choice of racers and performance street riders worldwide. For maximum sprocket life, chain cleaning and tension should be checked every 300–400 miles. The 803AZK-40 is part number 803AZK in the 40-tooth configuration.