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Again, I get all my info from the Shimano e-tube compatibility chart here: http://e-tubeproject.shimano.com/pdf/en/HM-CC.3.2.0-01-EN.pdf
And yeah, you need to change your junction and battery (SC-MT800 and BT-DN110 for example) for synchronised shifting.
Or change your derailleurs (to XT or XTR), junction (to SC-M9050) and connect a wireless unit (SM-EWW01)..
I think the reason for all this is that different parts need to receive and process the settings needed for synchronised shifting and the older derailleurs, junctions and batteries where never designed for this. So you need some kind of combination of new stuff to make this happen.
Jaap
@Soul
Right... now i have questions.
I have a 6770 group (SM-BTR1 battery) from 2013 - assume they're all the same.
I am also in the process of changing from STI levers to the SW-R600 (two on order) with flat bars. I've ordered the SM-BCR2 and the SM-EW90-A junction as well.
Questions:
Can i return one of the SW-R600 and the SM-EW90-A and get the MT800?
Will that then control the front and rear derailleurs with a single set of buttons?
As the MT800 is wireless, do i need the SM-BCR2?
Would i need to change to a BT-DN110 battery?
And finally, why is this all so complicated?