Shimano XT RD-M8120 Rear Derailleur Inner Plate

No, this specific inner plate is engineered exclusively for the Shimano XT RD-M8120 rear derailleur. It will not fit other models, so please verify your derailleur model number before purchasing.

No, this is strictly the replacement inner plate. You will need to reuse your existing pulley wheels and hardware, or purchase new ones separately if they are also worn.

SGS refers to the long cage length of the derailleur. This plate is specifically designed to fit the geometry of the long cage RD-M8120, so it will not work with short or medium cage derailleurs.

It is a moderate repair that requires basic mechanical skills. You will need to remove the pulley wheels and the cage tension spring, so ensure you have the correct Allen keys and a clean workspace to keep track of the small hardware.

Replacing the inner plate is a cost-effective way to restore your derailleur if the rest of the mechanism is still functioning perfectly. It is a smart, sustainable choice if you have bent or damaged the cage during a ride but the derailleur body itself is intact.