Vortex 485ZK-39 Black 39-Tooth 520-Pitch CAT5 Aluminum Rear Sprocket

The Vortex 485ZK-39 is a 39-tooth, 520-pitch CAT5 aluminum rear sprocket finished in a sleek black anodized coating. Engineered for motorcycle riders who demand precision and performance, this sprocket is 100% CNC manufactured in the USA from a specially formulated aluminum alloy to Vortex's exact specifications.

Key Features:

• 39-Tooth / 520-Pitch rear sprocket for precise gearing customization
• CAT5 aluminum construction — lightweight design reduces rotating mass for improved acceleration and throttle response
• Black anodized finish provides corrosion resistance and a clean, aggressive look
• Patented Vortex tooth design increases sprocket longevity and promotes smooth, quiet chain engagement
• 100% CNC machined in the USA to tight tolerances, ensuring concentricity and consistent fitment
• Specially formulated alloy per Vortex's proprietary material specifications

The 485ZK-39 is a direct bolt-on upgrade over heavier OEM steel sprockets. The reduced rotating mass translates to quicker acceleration and more responsive power delivery. Whether used on the street or track, Vortex rear sprockets are trusted by racers and enthusiasts worldwide for their quality, durability, and performance. Always replace the chain and front sprocket simultaneously for optimal drivetrain longevity.