• I want to "reset" my di2 rear as I've clearly fucked something. Should I wind out the limit screws and do the 5th gear setup and then reset the limits?

  • Were the limit screws right? I normally leave them alone unless the RD literally can't move into the end gears. If the indexing is off then I'd just keep playing with the microadjust until sorted.

    What do you think is wrong? What's happening?

  • I don't think there's a "reset", not for shimano or SRAM, only Campagnolo had a zero offset.
    If it works with one wheel and the other one is out of adjustment parameters it's probably the wheel.

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