[QUOTE=creaturely;5177891
My one issue has been with dropping my chain-- usually (but not always) while shifting; if not then, then over a bump or through a pothole. I gather that this is a common problem with a single front ring setup (though once the drop was off the big ring of the cassette rather than off the front!). But it seems to be getting more frequent-- at least once a ride, sometimes twice. Has anyone else experienced this, and if so, what are my options? I gather there is some kind of roller device? I'd rather avoid hanging something off the bike if I can avoid it (if I can't, I can't). Would shortening the chain help. or would it just make it that much harder to put the chain back on when it pops off? Any advice would be much appreciated.[/QUOTE]
I've been through three Dahons that had too long chains. Once the length was adjusted I never experienced a drop-off, even on the bike with no ring guard. Also check for deformed/worn chain rings and that your rear hub is square with the frame.