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Thread: Di2 - BB clearance for internal wiring

  1. #1
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    Default Di2 - BB clearance for internal wiring

    I'm considering the purchase of a non Di2-specific frame that I would really like to run Di2 on. Its a steel frame, so no worries about drilling holes. My concern is cable clearance around the bottom bracket area. It seems like it could be a tight fit resulting in pinched/cut wires.

    Obviously I could run it externally, but that kinda defeats the point in my mind.

    Has anyone done this? Maybe some filing is in order, to open up the vent holes?
     

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    Default Re: Di2 - BB clearance for internal wiring

    You need enough room for the junction box to fit into one of the holes and to use a Di2 specific BB insert which comes with an internal wiring harness.

    The hole in the bb shell to the chainstay needs to have enough room to clear the bb cup and be big enough for the wiring to fit through.

    A little planning will set you up right. Or bring it to an experienced Di2 installer who has done some mod projects.

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    Default Re: Di2 - BB clearance for internal wiring

    Thank you. Making further inquiries...
     

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    Default Re: Di2 - BB clearance for internal wiring

    Certain BB's play better then others. Remember, you not only need to clear the holes in the frame, but have enough room between the BB sleeve/ cups and shell. It can be snug.

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    Default Re: Di2 - BB clearance for internal wiring

    I have found that the sleeve on the King BB is narrower than even the DI2 specific Shimano BB sleeve and offers more clearance for the wires running out of the downtube into the seattube and chainstays. It's not a huge difference, but it's enough to make the install easier.
     

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