The advantages of Di2 (Digital Integrated Intelligence) are clear for everybody who has tested it (see our review here http://www.220triathlon.com/gear-review/shimano-di2): changing gears becomes easier, effortless and faster by simply touching the shift buttons.
Shimano Ultegra 6770 series with Di2 technology consists of Dual Control Levers, electronically operated front and rear derailleurs, a battery and electric cables. For the remaining components you will rely on the products of the mechanical Shimano Ultegra 6700 component group.
The electric cables include only two core wires (DURA-ACE Di2 has four) and the connectors are smaller too with a diameter of 5.1mm (-3.7mm compared to DURA-ACE Di2). Easy plug and play system to connect the cables, which will be available in different lengths to accommodate most frame dimensions. Connection with PC for diagnosis and changing the shifting order.
ULTEGRA 6770 products will exclusively become available in the new ULTEGRA glossy grey color. The products are not compatible with DURA-ACE Di2.
The Shimano Ultegra Di2 will be available from September 2011.