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You can probably get it to run ok on 9 speed using ERG mode if she doesn't shift at all, but clearly indexing will be all wrong.
In my experience turbo noise is suitable white noise, the things that potentially woke the baby up was the sharp noises, like clunky gear changes, clipping in, and any excess noise from rattling.
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Also my mrs might want to use it, her bike is 9 speed though, mine 11. Is the only option with a direct drive to convert her bike to 11 speed?
My bike is 11 speed, running on a 10 speed cassette using only ERG. I think you need to work down, so you'd have to fit a 9 speed cassette to the trainer (may limit your choice of trainer?!). Don't think you can run a 9 speed chain on an 11 speed cassette as the chain is wider on the outside.
Don't really have noise issues with an Elite Suito, can't hear it from other rooms with the door shut. Can also take a 9 speed cassette.
I think I'm on the look out for my first turbo. Noise is a concern as we have a baby on the way, with the bedroom above where I'll be using it in my kitchen (floor is getting sounds insulated but still...) So direct drive is probably the way to go right?
Also my mrs might want to use it, her bike is 9 speed though, mine 11. Is the only option with a direct drive to convert her bike to 11 speed?