Vortex 427ZK-39 CAT5 530 Pitch 39-Tooth Aluminum Rear Sprocket Black

The Vortex 427ZK-39 is a CAT5 series aluminum rear sprocket featuring a 530 chain pitch and 39 teeth. CNC machined in the USA from a specially formulated aluminum alloy per Vortex specifications, this sprocket is black anodized with contrasting machined-silver accents — delivering both durability and a distinctive appearance.

Vortex's patented sprocket design sets it apart from the competition. Lightweight aluminum construction significantly reduces rotating mass compared to a stock steel sprocket, improving power transfer and overall drivetrain responsiveness. The unique tooth profile is engineered for extended wear life and consistent chain engagement.

Key Features:

• Chain Pitch: 530
• Tooth Count: 39T
• Material: Specially formulated aluminum alloy per Vortex specifications
• Finish: Black anodized with contrasting machined silver accents (CAT5 / ZK series)
• 100% CNC manufactured in the USA
• Patented Vortex tooth design for extended sprocket longevity
• Reduces rotating mass vs. OEM steel sprocket
• Fits stock (OEM) wheels — no modifications required

The 427ZK bolt pattern is the correct fitment for Kawasaki ZX-14 / ZX-14R (all model years) using stock wheels. Whether tuning gearing for street riding or track use, the Vortex 427ZK-39 is a proven, race-grade upgrade.