Vortex 317ZKV4-39 VTX Aluminum Rear Sprocket 39-Tooth Black Anodized

The Vortex 317ZKV4-39 is a 39-tooth VTX-series aluminum rear sprocket engineered for serious street and track riders who demand lightweight performance without sacrificing durability. Manufactured by Vortex Racing in the USA, this sprocket is a direct-fit replacement and gearing upgrade designed to reduce rotating mass and sharpen throttle response.

Key Features:

• Lightweight aluminum construction — machined from a specially formulated alloy per Vortex specifications for an optimal strength-to-weight ratio
• 100% CNC manufactured in the USA — precision-machined to the tightest tolerances for consistent fitment and performance
• Black anodized finish — hard-coat anodizing bonds to the aluminum surface, providing corrosion resistance and a durable, low-friction finish
• Vortex patented tooth design — unique saber tooth profile engineered to increase sprocket longevity and promote smooth chain engagement
• 39-tooth rear sprocket — provides a balance of acceleration response and top-end performance suitable for street and track use
• VTX series fitment — compatible with applicable Vortex sprocket carriers and direct OEM bolt patterns per the 317 application

Vortex Racing has spent over 15 years developing race-proven drivetrain components trusted by professional race teams worldwide. The 317ZKV4-39 delivers the same race-quality engineering to everyday riders seeking a performance upgrade over heavy stock sprockets. Reducing rotating mass at the rear wheel translates directly to improved acceleration, sharper deceleration, and more responsive handling.