Shimano Y2BA12000 road front derailleur internal protection plate

Shimano ’s Y2BA12000 internal guard is a small but essential spare part for the proper functioning of certain Shimano front derailleurs for road and gravel bikes.

Positioned on the inside of the front derailleur, this plate helps guide the chain when changing chainrings. In particular, it helps make the shift from the small to the large chainring smoother and minimises unwanted noise or friction.

Made from composite material, the Y2BA12000 plate is fitted by clipping it into place, making it easy to replace a worn, damaged or lost part without having to replace the entire front derailleur.

Part number Y2BA12000 appears, in particular, in the spare parts diagrams Shimano for the Ultegra FD-R8000 front derailleur as well as for the GRX FD-RX810. It is also marketed as a compatible part for certain Shimano 105, Ultegra and GRX models.

Key features of the Shimano Y2BA12000

• Shimano spare part.
• Protective plate located inside the front derailleur.
• Helps guide the chain when changing chainrings.
• Enables smoother and quieter chainring changes.
• Made from composite material.
• Clip-on fitting.
• Allows you to replace only the damaged part.
• Compatible with several front derailleurs Shimano, road and gravel.
• Manufacturer’s part number: Y2BA12000.
• EAN code: 4524667672913.

A small part that plays an important role

Although it is inconspicuous, the internal guard plays a part in ensuring the front derailleur functions correctly. In particular, it guides the chain as it moves from the small chainring to the large one, helping to ensure a smoother gear change.

A damaged, missing or incorrectly positioned plate can disrupt the mechanism’s operation and cause noise or difficulties when changing chainrings. Replacing this part may therefore be all that is needed to restore a derailleur to working order when the rest of the mechanism is still in good condition.

Shimano ity: Y2BA12000

Part number Y2BA12000 is notably associated with several Shimano front derailleurs for road and gravel bikes. It is listed as a spare part for the Ultegra FD-R8000 (Shimano ) and the GRX FD-RX810 (Shimano ). It is also advertised as being compatible with certain models in the 105, Ultegra and GRX ranges.

Please note: compatibility must be checked against the exact model of your front derailleur. The fact that a derailleur belongs to a Shimano 105, Ultegra or GRX range does not automatically guarantee compatibility.

This plate is specifically designed for the relevant mechanical derailleurs; it must not be confused with a part intended for Di2 systems. A dedicated product specification sheet, for example, indicates incompatibility with a GRX Di2 derailleur.

Our advice: before ordering, note down the exact part number marked on your front derailleur and compare it with the compatible part numbers. This is the safest way to avoid ordering the wrong part.

Technical specifications