In 2008 SHIMANO first introduced electronic shifting to road cycling in its Dura-Ace 7970 groupset. In 2011 it became available for Ultegra. Today SHIMANO announced they will integrate its electronic shifting technology (Di2) in Ultegra 6800 groupset. Ultegra takes pro-tested technologies to a wider audience. Whether it is a mechanical or electronic shifting interface, Ultegra provides the highest quality outside professional racing.
The advantages of Di2 (Digital Integrated Intelligence)
are clear for everybody who has tested it: changing gears becomes easier, effortless and faster by simply touching the shift buttons. Control at the top of your fingers. Additional benefits include an automatic trimming front derailleur, unmatched precision plus super easy installation and adjustment. This allows automatic chain guide movement in response to the gear position of the rear derailleur. There is no more need for concentration on trimming when riding.
Features of Shimano Ultegra 6870 group:
Compared to the previous Ultegra Di2 (6770) SHIMANO improved the ergonomics of the dual control lever for easier access. Especially on top of the – slimmer – hoods riders have more control than ever. Also the shape of the shift button improved and the contrast of the surface is more recognizable. New to the Ultegra category are the so called time trial shifters (ST-6871). They offer the same braking control as the Dura-Ace ST-9071 and allows a rider to shift gears while braking
Shimano Ultegra ST-6871
- Quick access (Shifting at multi-position and shifting while braking are possible)
- Offer same braking control as Dura-Ace ST-9071
- Reach adjust
- Aluminium lever
In order to ensure proper functioning of the electronic Di2 drive system, all components require the same firmware version. The optional diagnostic device allows for reading out or updating the firmware version. An operation of components with different firmware versions may cause a malfunction or loss of function.
The SEIS (Shimano Electronic Intelligence System)
is based on the Shimano Index System (SIS) that has proved its superior gear changing characteristics over the years. The big difference is that in this case, the shifting action is provided for by electronics instead of mechanics. The programmed motion allows quicker and smoother shifting with less danger of chain drop in all conditions and situations.
The Ultegra Di2 products are not compatible with Dura Ace Di2.