you'll definitely need to adjust the b screw if you've fitted a larger cassette.
32 should need a medium/long cage but you might well get away with it. I just fitted a short cage etap mech with a 30t on my wife's bike and it works fine
Depends on the RD. I ran 32T cassettes quite happily on short cage Di2 RDs.
@fredtc started
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you'll definitely need to adjust the b screw if you've fitted a larger cassette.
32 should need a medium/long cage but you might well get away with it. I just fitted a short cage etap mech with a 30t on my wife's bike and it works fine