Vortex 817ZB-39 Steel Rear Sprocket 39-Tooth Satin Black

The Vortex 817ZB-39 is a 39-tooth steel rear sprocket finished in an electro-plated satin black coating for corrosion resistance and a clean, aggressive look. Built to Vortex's exacting standards, this sprocket is engineered for riders who demand precision, durability, and consistent power transfer from their drivetrain.

Key Features:

• 39-Tooth Rear Sprocket — allows for precise gear ratio tuning to suit your riding style
• Carbon Steel Alloy Construction — manufactured to Vortex's proprietary material specifications for maximum strength and wear resistance
• Satin Black Electro-Plated Finish — provides corrosion protection with a durable, low-profile appearance
• Patented Tooth Design — Vortex's unique tooth geometry extends sprocket longevity and improves chain engagement
• Precise Tolerances — ensures proper concentricity for smooth, vibration-free operation
• Direct OEM Replacement — bolt-on fitment with no modifications required

Vortex Racing is a U.S.-based manufacturer with a long track record in Motocross, Supercross, Road Racing, and Flat Track Racing. Every sprocket is developed with direct feedback from professional race teams and held to the tightest tolerances in the industry. The 817ZB-39 is an ideal choice for street and track riders looking to replace worn OEM gearing with a proven, high-quality upgrade.