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Clamp-on:1-1/4" (31.8mm), 1-3/8" (35mm)
For double cranksets
Shimano Dura-Ace Di2 clamp adapter for Shimano braze-on front derailleurs. Converts a braze-on derailleur to a clamp-on version. 1-1/4" (32mm) or 1-3/8" (35mm).