Vortex 312ZK-39 Steel Rear Sprocket 39T

The Vortex 312ZK-39 is a 39-tooth steel rear sprocket designed for high-performance street and track motorcycles. Manufactured by Vortex Racing, this sprocket is precision-machined from high-grade steel to deliver exceptional durability and consistent power transfer under demanding riding conditions.

Key Features:

• 39 Teeth – Optimized tooth count for balanced acceleration and top-speed performance
• High-Grade Steel Construction – Resists wear and maintains precise chain engagement over extended use
• Precision CNC Machined – Tight tolerances ensure smooth, vibration-free operation
• 312ZK Bolt Pattern – Engineered for direct OEM-replacement fitment on compatible models
• Vortex Racing Quality – Trusted by professional and amateur racers worldwide

The 312ZK-39 sprocket is an excellent choice for riders looking to maintain OEM gearing ratios or fine-tune their drivetrain for specific track or street riding preferences. Vortex sprockets are fully compatible with standard O-ring, X-ring, and Z-ring chains of the appropriate pitch.