It usually works out pretty well with native speakers not familiar with the term. They usually have a moment with a blank stare thinking “what the hell is an acoustic bike?” and then realize all at once with a smirk.
As for your second question, acoustic becomes a good classification when talking to a group where electric bikes are the default, just like electric becomes a good classification where pure pedal bikes are the default. In a group where ebikes are the default they might assume you’re talking about throttle type if you say analog, or a pedal assist bike if you said manual. It started as a joke and became a useful term.
It usually works out pretty well with native speakers not familiar with the term. They usually have a moment with a blank stare thinking “what the hell is an acoustic bike?” and then realize all at once with a smirk.
As for your second question, acoustic becomes a good classification when talking to a group where electric bikes are the default, just like electric becomes a good classification where pure pedal bikes are the default. In a group where ebikes are the default they might assume you’re talking about throttle type if you say analog, or a pedal assist bike if you said manual. It started as a joke and became a useful term.