With the Di2 technology of the Shimano Ultegra ST-6770, shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear.
The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts. The Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts.
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