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Indeed.
No, I don't think so, but might be able to route the wiring under the BB towards the FD.
I don't have hands on with any Pinnacles anymore, so this is a question for @jameso
It is a gravel-centric bike, so most will just run a single.
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@damitamit - If you were prepared to drill gear cable stops in DT and CS out to brake hose OD and could house the Di2 wire in something 6mm OD you could make it work. There's room for a wire in the BB and the RD wire/cable combo can exit the base of the DT as normal. Making an exit hole in ST for the FD would be a bit of a gamble, you're creating a stess point there.
is this one flat mount too?