2015 Cannondale Synapse Black Inc

[mdavis501]

I'm looking at a used Synapse black inc version that is model year 2015. Comes with Dura Ace Di2. I can't seem to find the model number of the Dura Ace di2 that would come on this bike and I'd like to be able to do synchronous shifting, but it's my understanding only the 9100 series does this. Anyone with experience with this bike's detailed specs?

[2old4this]

Not familiar with '15 synapse (wife has a '14 one) but to convert her bike's 9070 to use syncroshifting, all I had to do is to replace the internal battery with the new one, BT-DN110, and update the firmware.
Then she decides she likes mechanical ...