Vortex 151ZK-39 520 Steel Rear Sprocket 39-Tooth Black

The Vortex 151ZK-39 is a 39-tooth, 520-pitch black steel rear sprocket built to Vortex's exacting performance standards. Manufactured from carbon steel alloy and finished with an electro-plated satin black coating, this sprocket delivers outstanding corrosion resistance and long-lasting durability under real-world riding conditions.

Key Features:

• 520 Chain Pitch – Designed for use with standard 520-pitch drive chains
• 39 Teeth – OEM-equivalent tooth count for balanced acceleration and top-end performance
• Carbon Steel Construction – Durable alloy steel built to Vortex specifications for strength and longevity
• Electro-Plated Satin Black Finish – Resists corrosion and provides a clean, stealthy appearance
• Hardened Teeth – Precision-hardened tooth profile maintains shape and chain engagement over extended use
• Vortex Patented Tooth Design – Unique geometry improves sprocket longevity compared to conventional designs
• Weight-Reducing Profile – Cupped body design removes excess material to minimize rotating mass without sacrificing strength

Vortex steel rear sprockets are an ideal choice for street and sport riders who prioritize durability and consistent power transfer. The black electro-plated finish blends seamlessly with factory and aftermarket wheel hardware, while the hardened carbon steel construction is engineered to outlast standard OEM sprockets.