Shimano Ultegra RD-R8150 12-speed derailleur inner cage

The Shimano Ultegra Di2 RD-R8150 rear derailleur hanger consists of two parts. This inner plate is the left-hand side facing the wheel. Often subjected to rough handling, it can be damaged by contact with the rear wheel spokes, for example if the chain jumps off. Essential for the derailleur to function properly, it is important to keep the cage in perfect condition.

Replacing the inner cage is very simple. Simply unscrew the two screws holding it in place and remove it easily.

Technical specifications

RD-R8150 inner cage

Ultegra Di2 12-speed RD-R8150

Brand: Shimano