Vortex 642ZK-45 CAT5 Aluminum Rear Sprocket 530 Pitch 45-Tooth Silver

The Vortex 642ZK-45 is a CAT5 series aluminum rear sprocket designed for high-performance motorcycle applications. Built for the 530-pitch chain with a 45-tooth count, this sprocket is CNC-machined from premium 7075 aluminum and finished with a distinctive silver anodized and machined accent appearance — a hallmark of Vortex's ZK-series sprockets.

Key Features:

• 530 Pitch: Compatible with 530-series motorcycle drive chains
• 45 Teeth: Ideal for riders seeking improved low-end torque and quicker acceleration over stock gearing
• 7075 Aluminum Construction: Aerospace-grade alloy delivers exceptional strength at a fraction of the weight of OEM steel sprockets
• CNC Machined: Precision manufacturing ensures tight tolerances for accurate fitment and reduced chain wear
• Silver ZK Finish: Anodized base with CNC-machined silver highlights for a premium, race-ready appearance
• Patented Tooth Design: Vortex's unique tooth profile reduces friction and drag for smoother power transfer
• Reduced Rotating Mass: Lightweight aluminum construction lowers rotational inertia, improving throttle response and acceleration
• Made in the USA: Manufactured to Vortex Racing's exacting specifications

The Vortex 642ZK-45 rear sprocket is a proven choice for sport bike riders and track enthusiasts looking to optimize their final drive ratio. Replacing a heavier OEM steel sprocket with this aluminum unit reduces unsprung and rotating weight, contributing to sharper handling and quicker engine response. Always replace the chain and front sprocket together when installing a new rear sprocket for optimal drivetrain life.