At DMG Motorsports, we present the Vortex F5 Rear Sprocket 39T-525 Black HC for Yamaha (654K-39) — a race-proven aluminum rear sprocket built to shed weight without sacrificing durability. Vortex has long been a favorite among competitive riders looking to sharpen throttle response and reduce rotating mass, and this F5 sprocket brings that same performance pedigree to your Yamaha's drivetrain. Precision machined and hard-coated for a clean, aggressive black finish, it's designed to hold up to demanding street or track use while keeping your chain running smoother for longer.

Features:

• CNC machined from 7075 aluminum for amazing strength and light weight
• Hard anodized with a jet black dye for a durable, aggressive finish
• PTFE coated for added lubricity and durability
• Unique tooth design engineered to increase sprocket longevity
• 100% CNC manufactured using a specially formulated alloy per Vortex specifications
• 39-tooth, 525 pitch configuration for direct-fit application on compatible Yamaha models
• Trusted by champions in professional and amateur racing alike
• Lightweight aluminum construction reduces rotating mass versus heavier OEM steel sprockets