Vortex 490ZK-51 Black 51-Tooth 520-Pitch Aluminum Rear Sprocket

The Vortex 490ZK-51 is a 51-tooth, 520-pitch black anodized aluminum rear sprocket engineered for motorcycle racing and performance street riding. Built to the exacting standards Vortex Racing is known for, this sprocket delivers a winning combination of lightweight performance and long-lasting durability.

Key Features:

• 51-Tooth / 520-Pitch – Direct-fit rear sprocket sized for 520-pitch chain applications
• 7075-T6 Billet Aluminum Construction – Lightweight aerospace-grade aluminum reduces rotating mass for improved throttle response and acceleration
• Black Anodized Finish – Hard-anodized black finish resists corrosion and wear for lasting good looks and durability
• 100% CNC Machined – Precision machined to the tightest tolerances for exact fitment and smooth chain engagement
• Patented Saber Tooth Groove Design – Vortex's unique tooth profile increases sprocket longevity and optimizes chain wear
• Race-Proven Performance – Tested and validated by professional race teams worldwide
• Made in the USA – Manufactured by Vortex Racing, a U.S.-based company owned and operated by motorcycle racers and enthusiasts

The 490ZK-51 allows riders to fine-tune their final drive ratio for more low-end torque and improved acceleration. Whether you're hitting the track or demanding more from your street machine, this Vortex aluminum rear sprocket is a direct upgrade over heavy OEM steel units.