SHIMANO Dura Ace Di2 derailleur 2013
The derailleur Dura Ace Di2 group is a mechatronic unit which precisely the chain and quickly pushes the desired chainring. In conjunction with the rigid chainrings, with their perfectly matched switching aids, switching operations are performed in the shortest possible time.
Typical problems of the circuits, such an adjustment of the derailleur no longer exist thanks to the electronics!
Mounting: braze or clamp 31.8 mm or 34.9 mm