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@user65185
PS I should now out myself as an eTap user. I have never successfully sneaked up on it and pushed the leaver without waking up the derailleurs. Makes me think there's a sort of 'does a tree falling in the woods with no one to hear it'-type scenario whereby the only way I can prove the alleged accelerometers actually exist is to change gear without touching the bike. Or even being in the same room. It's Schrodinger's Groupset.