Shimano SM-AD91 Dura Ace R9150 Front Derailleur Adapter

Aluminium clamp to mount the Dura Ace and Ultegra (Di2) braze-on front derailleur to frames without a braze-on socket. The 31.8 mm includes the adapter to reduce to 28.6 mm.
Compatibility: FD-R9100, FD-R9150, FD-R8000, FD-R8050