JT TwinStar Hybrid Rear Sprocket 520 51T Black

JT TwinStar Hybrid sprockets combine the durability of a steel outer ring with the light weight of an aluminum carrier ring.

• High-induction, hardened high-carbon steel outer chain ring
• Lasts six times longer than 7075-T6 aluminum sprockets
• Aviation grade 7075-T6 aluminum inner sprocket carrier
• Lighter than steel for reduced power loss
• Precision made components using state-of-the-art laser cutting and CNC machining equipment
• Race-proven design
• Sold individually