My eBikeKit motor on the front wheel has been acting up lately and is making a kind of a bus or truck braking noise when I'm accelerating. It's hard to explain and I can't record it easily since it only happens when I accelerate hard and my hands are busy steering!
I've spotted a Tidalforce iO on Craigslist and am thinking about buying it. It's got a beach cruiser frame but can be modded to ride more like a regular bike. The frame on the iO has a nice big open area for placing batteries in the middle of the frame. The motor on the TF bikes are also very famously, totally silent.
I hope to be able to report that I've picked it up and am modding it for my purposes shortly!