Vortex 641AZK-39 CAT5 Aluminum Rear Sprocket 520 Pitch 39 Tooth Black

The Vortex 641AZK-39 CAT5 Aluminum Rear Sprocket delivers race-proven performance and durability for street and track motorcycles. This 39-tooth rear sprocket features 520 pitch chain compatibility and is constructed from lightweight aerospace-grade 7075-T6 aluminum alloy for optimal power transfer and reduced rotational mass.

Key Features:

• 39 teeth with 520 pitch configuration
• CNC machined from aerospace-grade 7075-T6 aluminum alloy
• Black hardcoat anodized finish resists corrosion and wear
• Unique tooth profile design increases sprocket longevity
• Precision manufactured in the USA to strict tolerances
• Significantly lighter than steel sprockets for improved acceleration
• Self-cleaning tooth design prevents mud and debris buildup

Vortex CAT5 sprockets are trusted by professional racers worldwide and manufactured to the tightest tolerances in the industry. The hardcoat anodizing process creates a durable surface that maintains its finish even under aggressive riding conditions. Each sprocket undergoes rigorous quality control to ensure concentricity and proper tooth geometry for smooth, quiet operation and extended chain life.