Building on the huge success of Shimano Dura Ace Di2, Shimano offers a new line of Di2 components to complement its Ultegra collection.  With the Shimano Di2 Ultegra ST-6770 Dual Control Levers, shifting is executed by pressing a button. No power is needed anymore to shift gears. You can keep a tight grip on the handlebar and concentrate on riding instead of shifting. The shift system allows accurate and effortless shifting in difficult circumstances like cold hands or when you are completely exhausted.  Furthermore, the shifting performance will never be affected by contaminated or stretched cables since the shifting signal is transferred electronically. Additional benefits include an automatic trimming front derailleur, unmatched precision shifting plus easy installation and adjustment.

 

The Shimano Ultegra Di2 ST-6770's operating buttons work similar to mechanical Dual Control Levers so you don't need to re-program your mind for a new system. The ergonomic bracket shape provides a greater degree of ergonomics and control for a variety of riders.  The Dual Control Levers also features a reach adjustment mechanism which is perfect for people with smaller hands.