Thanks again for the info. I have the single-piece steerer tube type. Though I don't know the size. I suppose I should have measured that before posting. I have a stem I took off my cx bike or I could use my MTB stem, thanks for that. I'll need to look into it. I thought about the Dahon Revolve (on the same site you linked, left hand side) and have emailed the site with some questions.

I guess my main thing is will the drive train I mentioned work on this folder? Proably not anyone can answer without trying it, right? I figure it will unless there is something screwy with an odd-sized bb. If it won't fit, I've no need to tinker with the stem because I like the bike just fine as is for a commuter and riding with the family, but was thinking it could also make a good long-distance ride as well.