Renthal Rear Sprocket, Aluminum, 47-Tooth, Blue for Yamaha YZ 65 (121U-420-47GBBU)

Upgrade your Yamaha YZ 65 drivetrain with the RENThAL 121U-420-47GBBU rear sprocket, engineered for riders who want responsive power transfer and reduced unsprung weight. This blue aluminum sprocket is CNC-machined rather than stamped, allowing for precise shaping and a computer-aided ultra-light design that helps improve acceleration, handling, and overall drivetrain performance.

Made from high-strength, specially enhanced 7075-T6 aluminum, the RENThAL 121U-420-47GBBU is approximately 33% lighter than a comparable steel sprocket. Its lightweight construction helps reduce rotating and unsprung mass while maintaining the strength needed for demanding motocross and off-road riding. The 47-tooth configuration provides dependable fitment and performance for compatible Yamaha YZ 65 applications.

A specially engineered tooth profile allows the chain to roll smoothly on and off the sprocket. This design promotes longer chain and sprocket wear, reduces drivetrain noise, and supports efficient power delivery throughout the ride. The durable blue finish adds a distinctive appearance while complementing the precision-machined construction.

Designed for riders seeking a practical performance upgrade, the RENThAL rear sprocket combines lightweight 7075-T6 aluminum, accurate CNC machining, and a chain-friendly tooth profile in one reliable component. Confirm application and chain compatibility before installation.

Features:

• CNC-machined construction provides precise shaping and consistent performance
• Computer-aided ultra-light design helps reduce unsprung weight and improve power transfer
• High-strength enhanced 7075-T6 aluminum is approximately 33% lighter than steel
• Special tooth profile supports smooth chain engagement, longer wear, reduced noise, and efficient power delivery
• 47-tooth rear sprocket configuration for compatible Yamaha YZ 65 models
• Blue finish provides a distinctive appearance and durable surface

Ships from Parts Unlimited.