Vortex 177ZK-51 520 Steel Rear Sprocket 51-Tooth Black

The Vortex 177ZK-51 is a 51-tooth, 520-pitch steel rear sprocket engineered for performance motorcycle applications. Built to Vortex Racing's exacting standards, this sprocket delivers a reliable, long-lasting drivetrain upgrade over OEM components.

Key Features:

• 51-tooth rear sprocket — higher tooth count for increased low-end torque and acceleration
• 520 pitch — compatible with standard 520 chain setups
• Laser-cut carbon steel construction — provides extended service life compared to aluminum alternatives
• Electroplated satin black finish — corrosion-resistant coating for long-term durability
• Case-hardened teeth — withstands the demands of aggressive street and track riding
• 100% CNC manufactured — precision-machined to tight tolerances for smooth chain engagement
• Drilled lightening holes — reduces rotational mass without sacrificing strength

Vortex Racing is a U.S.-based manufacturer with a proven track record supplying top-quality sprockets to professional race teams in Motocross, Supercross, Road Racing, and Flat Track disciplines. The 177ZK-51 is a direct bolt-on replacement for compatible applications, requiring no modifications for installation.