Shimano Ultegra Di2 ST-6870 STI 2x11 (Pair)
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Shimano Ultegra ST-6870PA
Instant, accurate shifts
Improved ergonimics for easier access to the shift buttons from the top of the hoods
Cleaner wiring duo to single-wire E-tube connections (Easy to add satelite shifters to bar tops or in drops)
Programmable multi-shift function
Note: 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.
Note: The Ultegra Di2 products are not compatible with Dura Ace Di2.
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