• If I'm already running 6770, am I likely to have any issues with wiring channels for 6870?

    Concerned there'll be no hole from the seat tube to let the magic electricity out to the mechs. Am I being a daft twat?

  • Presume you mean 6700 (ie mechanical) rather than 10speed ultegra di2?
    As for the hole, it's easily solved:

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