Vortex 313ZB-39 Steel Rear Sprocket 39-Tooth 520-Pitch Black

The Vortex 313ZB-39 is a 39-tooth, 520-pitch steel rear sprocket finished in an electro-plated satin black coating for corrosion resistance. Engineered to Vortex's exacting standards, this sprocket is built from carbon steel alloy and features Vortex's patented tooth geometry to maximize longevity and deliver consistent, efficient power transfer from chain to wheel.

Key Features:

• Chain Pitch: 520
• Tooth Count: 39 teeth
• Material: Carbon steel alloy per Vortex specifications
• Finish: Electro-plated satin black for corrosion resistance
• Tooth Design: Vortex patented profile for extended sprocket life
• Precision-manufactured to tight tolerances for concentricity and smooth chain engagement
• Induction-hardened teeth to reduce surface wear under demanding conditions

Vortex Racing is a U.S.-based manufacturer with a long track record supplying components to professional road racing, motocross, and supercross teams. The 313ZB-39 is an excellent OEM replacement or performance upgrade for riders running a 520-pitch drivetrain who want proven durability with a clean blacked-out appearance.