Originally Posted by
downtuber
I'd be concerned with the derailleur more than anything. on folding bikes the derailleur is only a couple inches off the ground and looks like it would be really easy to damage it. on small 20 inch wheels the derailleur is practically scraping the ground. so I don't understand why the vast majority of folding bikes seem to come with derailleurs instead of internal hubs. My Downtube 8fh is the only folding bike I know of that comes with an internal hub.
Don't know where you're getting your information from, but there are lots of folding bikes and separable bikes that come with internal hub gears. The Bromptons come with them, the Mezzo's use to have an I4 but I don't know if they still do, Origami has the Fox Model just list a few....