Shimano Dura-Ace Di2 Rear Derailleur Bracket Axle Unit

No, this specific unit is engineered exclusively for the Shimano RD-R9250 Dura-Ace Di2 rear derailleur. It will not fit previous generations of Dura-Ace or other Di2 series derailleurs.

Yes, this is a complete replacement kit. It includes the bracket itself, the hanger mounting bolt, and the B-Axle bolt, providing all the necessary hardware for a full installation.

This component is typically replaced after a crash or impact that bends the derailleur hanger connection, or if the threads have become stripped over time. Replacing it restores the precise alignment required for the R9250's electronic shifting to function correctly.

If you are comfortable working with high-end drivetrain components, you can install this yourself using standard shop tools. However, because this is a critical alignment part for a precision electronic system, we recommend having a professional mechanic perform the installation to ensure perfect shifting performance.

This unit replaces the bracket that connects the derailleur to the hanger, but it does not replace the frame's derailleur hanger itself. If your shifting issues are caused by a bent frame hanger, you will need to replace or align that specific part separately.