Vortex 490ZK-39 Steel Rear Sprocket 39-Tooth

The Vortex 490ZK-39 is a 39-tooth steel rear sprocket engineered for high-performance motorcycle applications. Manufactured by Vortex Racing — a U.S.-based leader in motorsport components since 1995 — this sprocket is built to meet the demands of both track and street riders who refuse to compromise on quality or durability.

Constructed from a specially formulated carbon steel alloy per Vortex's exacting specifications, the 490ZK-39 delivers outstanding wear resistance and long service life. The steel construction makes it an ideal choice for riders who prioritize longevity and maximum durability over the weight savings of aluminum alternatives. A corrosion-resistant finish protects against the elements for lasting performance.

Key Features:

• 39-tooth rear sprocket for optimized drive ratio and acceleration tuning
• Carbon steel alloy construction per Vortex specifications for maximum durability
• Vortex patented unique tooth design increases sprocket longevity
• Corrosion-resistant finish (silver or satin black electro-plated)
• 100% manufactured in the USA to tight tolerances
• Designed to work with Vortex chain and sprocket systems

Vortex Racing components are tested on the track with direct feedback from top professional race teams worldwide, ensuring every part meets championship-level standards before reaching the consumer.