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Di2 ready frames typically have a frame hole near the front derailer, for that wire, plus some form of frame hole stops for either mechanical or electronic near the head tube and on the rear top of the drive side chainstay. My Chinese carbon has those plus a hole under the DT bottle cage should I desire to run an external battery.

One key to installing internal e-wiring is the DT junction box as well as wiring for F & R derailers as well as seatpost battery all gets installed in the DT before installing the bottom bracket.
 

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