A fun play on words used to refer to a regular, non-electric bike. It comes from electric guitars and acoustic guitars. There are electric bikes, so why not acoustic bikes?
A term made up by e-bike enthusiasts who know know "acoustic" relates to sound but use it because it's fun. Apparently makes obsessive weirdos angry.
Person A: Yeah, I have an electric bike but today I'm riding my acoustic bike.
Person B: Haha, that's a one. I'm not going to nitpick the scientific accuracy of the phase because I'm not a pathetic dweeb.
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