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Godfeckingdammit, all those hours I've wasted trying to sneak up on it and push the button without waking it up. Someone shall pay. So it's asleep unless you either push a button or make the slightest movement; it's not a very sound sleeper then.
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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.
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From Bikeradar so it must be true:
- It falls asleep
If you sneak up on an unsuspecting eTap group and ever so gently touch a shifter without moving the bike in the slightest, nothing happens. The group is sleeping. Accelerometers in the derailleurs wake the group at the slightest movement and keep it awake for a time even when still. When you are riding, it’s always awake.
This auto-pause feature allows for a longer life (a claimed 60 hours or 1,000km) with the 24g battery.
- It falls asleep
I'm running it on a SRAM Red cassette. It can be fractionally slow for the chain to move after the derailleur has shifted; I wouldn't say the derailleur movement itself is actually slow. The speed of the chain following the derailleur can vary depending on which cog, it does seem a little reluctant down at the smaller end of the cassette. I wonder if this is where the Shimano cassette might help.
I have spent many, many hours try to finesse the front derailleur position to avoid any slight chain rub on big chain-ring-biggest three cogs (not that I intend to use big-big but I'm a perfectionist and I want to know it would be spot-on if I did). In that respect, I think the Shimano model where the front derailleur trims itself is much better - Sram instead stubbornly insist the Yaw design means it isn't necessary, but it must have been possible to programme in. Mind you, I had pretty much the same problem with Red 20, so I wonder if I am towards the limits of bike geometry compatibility with Yaw anyway.