Vortex 313ZK-39 Steel Rear Sprocket 39-Tooth Black

The Vortex 313ZK-39 is a 39-tooth steel rear sprocket finished in electro-plated satin black. Engineered for motorcycles and ATVs, this sprocket is built to Vortex's exacting standards using carbon steel alloy for outstanding strength and durability under demanding riding conditions.

Key Features:

• 39-Tooth rear sprocket for precise gear ratio tuning
• Carbon steel alloy construction per Vortex specifications for maximum strength
• Electro-plated satin black finish to resist corrosion and enhance appearance
• Unique Vortex tooth design increases sprocket longevity and reduces chain wear
• Induction hardened to reduce surface wear and extend service life
• Manufactured to precise tolerances to ensure concentricity and smooth, quiet operation

Vortex Racing is a U.S.-based manufacturer with over 15 years of experience producing top-quality motorcycle racing components for Motocross, Supercross, Road Racing, Flat Track, and Minibikes. Every Vortex sprocket is track-tested with direct feedback from top professional race teams worldwide, making the 313ZK-39 a trusted choice for both competitive riders and street enthusiasts seeking OEM-quality replacement or performance upgrade gearing.