OK. So I don't get the whole single speed, fixed gear thing. But I'm going to try and figure it out. I just picked up an old 70's Fuji. It's a lugged frame, everything was clamped on, there's not even a derailleur mount on the frame. So it's really clean. Thought OK, this is it, got to single speed it, or fix gear it. I hear there are three options, fixed, semi-fixed, and freewheel. Is that right?