Vortex 202ZK-39 420 Aluminum Rear Sprocket Black 39T

The Vortex 202ZK-39 is a high-performance 420 pitch aluminum rear sprocket with 39 teeth, finished in black anodize. Engineered as a direct lightweight replacement for heavy OEM steel sprockets, this sprocket delivers measurable gains in throttle response and drivetrain efficiency.

Key Features:

• Aerospace-grade 7075 T6 aluminum construction — maximizes strength while minimizing rotational mass
• 420 pitch chain compatibility — designed specifically for 420-pitch drivetrain systems
• 39-tooth rear sprocket — provides optimized gear ratio for acceleration and top-end balance
• 100% CNC manufactured in the USA — precision machined for consistent fit and reduced drivetrain wear
• Unique saber tooth groove design — extends sprocket longevity by minimizing chain drag and wear
• Black anodized finish — corrosion-resistant coating adds durability and aggressive styling
• Specially formulated Vortex alloy — engineered to meet Vortex's own performance specifications

The 202ZK-39 is a proven upgrade for riders looking to reduce unsprung weight and improve power delivery. The lighter rotating mass compared to stock steel sprockets translates directly to faster acceleration and more responsive handling. Made in the USA to exacting race standards, this sprocket is built to perform at every level from trail riding to competitive off-road events.