Product Description
Shimano SM-AD91 Dura Ace R9150 Front Derailleur Adapter -FD-R9100, FD-R9150, FD-R8000, FD-R8050
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.