Vortex 120AZK39 Rear Aluminum Sprocket Pitch Sprockets - 520 39-Tooth

The Vortex 120AZK39 is a 39-tooth, 520-pitch rear aluminum sprocket engineered for performance motorcycle applications. Designed and manufactured in the USA, this sprocket delivers a significant weight reduction over steel alternatives, lowering rotating mass and improving throttle response and overall drivetrain efficiency.

Key Features:

• 39-Tooth / 520-Pitch rear sprocket for precise gear ratio tuning
• Lightweight aerospace-grade aluminum construction reduces rotating mass
• 100% CNC machined in the USA to tight tolerances
• Specially formulated alloy per Vortex specifications for optimal strength-to-weight ratio
• Anodized finish provides corrosion resistance and long-lasting appearance
• Unique patented tooth design increases sprocket longevity and chain engagement
• Trusted by professional racers and championship-winning teams

Vortex rear sprockets are a popular upgrade for riders looking to fine-tune their gear ratios for improved acceleration or top-end performance. Adding teeth to the rear sprocket increases low-end torque and acceleration, while reducing tooth count raises top-end speed. The 120AZK39 is an ideal choice for both track and street use where weight savings and precision matter.