Description
Shimano Clamp SM-AD91 for braze-on front derailleur
With the Shimano SM-AD91 clamp, mechanical and electronic braze-on front derailleurs of the Dura-Ace, Ultegra, 105 and GRX groupsets
Can be attached to frames without braze-on sockets.
The clamp is made of aluminium and is available for 34.9 mm and 31.8 mm seat tubes.
The latter version also comes with a shim which makes the clamp compatible with 28.6 mm seat tubes.