Shimano Ultegra RD-R8050-SS Rear Derailleur Inner Plate

No, this specific part is designed for the RD-R8050 Di2 electronic derailleur. While the mechanical and electronic versions share some similarities, the cage assemblies are not interchangeable.

You will need a set of hex keys to remove the cage assembly and potentially a chain tool to break your chain for easier access. It is a straightforward mechanical task, but having a torque wrench on hand is recommended to ensure the cage bolts are tightened to Shimano's factory specifications.

No, this plate is strictly for the SS (short cage) version of the RD-R8050. The geometry and length of the inner plate differ significantly between the short and medium cage models, so they are not compatible.

If the derailleur body itself is undamaged and the pivots are still tight, replacing just the inner plate is a cost-effective and sustainable way to restore performance. However, if the derailleur sustained a heavy impact that bent the hanger or damaged the parallelogram, replacing the entire unit is usually the safer bet for long-term reliability.

No, this is the inner plate only. You will need to transfer your existing pulley wheels and their associated hardware over to the new plate during installation.