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yup - it will work with just one shifter ie that climbing shifter - just not with a sprint shifter as they don't have the neccessary circuits in them.
Will obv need a battery + charger, cables and a junction-a box as well as rear derailleur
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My Straggler has a 1x11 flat-bar setup using SW-R600, RD-6870, junction-A and the cylindrical battery in an SM-BTC1 case by the bottle cage.
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Yes it will work. Am currently in the process of setting up a 1 x 11 Di2 system, using the climbing shifter and the Hylex conversion kit you can get for this.
TRP tell you what you need on this page;
danb
Emyr
andyp
@duncs
Do you actually need Di2 levers for electronic shifting, or could you use a climbing shifter (e.g. SW-R600)?
Currently have a spare frame with 5700 shifters and only the rear derailleur cabled up. No brakes on the frame.
Thinking of putting an 11sp cassette onto the turbo so that I don't have to faff if swapping bikes.
Could I get an 11sp Di2 rear derailleur and a climbing shifter button on the bars, and just control shifting completely with the button, leaving the 5700 levers there without any cables connected at all.
(saw a comment on road.cc that implies it might be doable
http://road.cc/content/forum/213603-di2-climbing-shifter-and-r785-hydraulic-levers
)