Shimano Ultegra Di2 Seat Tube Adapter - Road Bike Shop
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Shimano Ultegra Di2 Seat Tube Adapter
Price: $9.99buy now
If you have a Shimano Di2 system and want to run it on a frame that's designed for a clamp-on front derailleur, then you'll need this adapter clamp. It's available to fit 31. 8mm or 34. 9mm seat tubes. Simply bolt it directly to your Di2 front derailleur braze-on style mount, and you'll be ready to position the whole assembly onto your seat tube.