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Old 02-24-21, 08:38 PM
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I think the focus on Di2 is misplaced. This is not a Di2 problem, I reckon. I mean, the RD is moving (or attempting to move) across the cassette. And aside from the indexing being adjusted through the shifter instead of at the RD, it operates like any other drivetrain in this regard.

There is something physical (mechanical) going on at the hub or with the cassette. My money is on the wrong spacer, or something is hinky with one of the sprocket spacers.
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