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joel_austen
Jaap
That's only for the MU-705 (alfine di2 motor unit), if you look at the MTB chart (with the XT rear derailleur) there is no note on the ST-S705R.
If you want a really clean setup you could go for the same build as this: http://weightweenies.starbike.com/forum/viewtopic.php?t=143555
Just use a SM-EW90-A junction under your saddle, have a long wire from your shifter and derailleur to your seat and a short wire to your seatpost battery. Maybe add a wireless unit and battery.