Shimano Dura-Ace Pulley

Yes, this set is designed for both the RD-9000 mechanical and RD-9070 Di2 11-speed rear derailleurs.

Yes, the package includes both the upper guide pulley and the lower tension pulley, allowing you to replace the full set at once.

No, these are specifically engineered for 11-speed Dura-Ace systems. Using them with other drivetrain speeds will likely result in poor shifting performance and potential chain issues.

Authentic Shimano pulleys are designed to match the exact tolerances and bearing seals of your original derailleur. They provide the most reliable, quiet, and consistent shifting performance as intended by the manufacturer.

You should replace them if the teeth on the pulleys appear sharp or pointed, or if you notice excessive side-to-side play in the bearings. Worn pulleys often contribute to increased drivetrain noise and sluggish shifting.