I just swapped out 11-28 cassettes for 11-25...do I need to do any data changes within the Di2 app? I use synchro shift but have not changed the shift settings.
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Not essential, but good to do. First, you can tell it your cassette size. So, if you use something like Di2Stats or the gear fields on your head unit, it would show the correct gears. Second, you might want to adjust your synchro so it does one fewer RD compensating shift at the big-to-small CR shift.