Vortex 312ZR-39 Aluminum Rear Sprocket 39-Tooth Silver

The Vortex 312ZR-39 is a 39-tooth aluminum rear sprocket designed for high-performance street and track use. Machined from lightweight aerospace-grade aluminum and finished with a silver anodized coating, this sprocket delivers an ideal balance of reduced rotating mass and long-lasting durability.

Vortex sprockets feature a patented saber-tooth profile — a uniquely grooved tooth design engineered for self-cleaning action that keeps the sprocket clear of debris and extends overall service life. The precision CNC machining ensures tight tolerances for smooth, consistent chain engagement and reduced drivetrain wear.

Key Features:

• 39-tooth rear sprocket configuration
• Lightweight aerospace-grade aluminum construction
• Silver anodized finish for corrosion resistance and appearance
• Patented saber-tooth grooved design for self-cleaning performance
• CNC-machined to tight tolerances for precise chain engagement
• Electrically coated for a brighter, longer-lasting finish
• Direct OEM-style bolt pattern replacement

Vortex Racing has been producing race-proven drivetrain components since 1995, with products trusted by professional riders competing at the highest levels of AMA Superbike, Supercross, and motocross. The 312ZR-39 is a direct-fit replacement sprocket that offers a meaningful weight savings over steel OEM sprockets without sacrificing reliability.