I know a BMX is not strictly a SS/FG but has anyone ever, just for fun, geared one at ~65GI+ with a flip flop to something more bmxish as a run around. I'm planning to build up an alloy frame, make it really light (for a bmx), polish most of it and run black everything else for a bit of a laugh.

i rode around on a bmx for a couple of years because i loved single speed and actually thought that was the only way to go ss. i know! idiot. i loved it but the spinning out was a pain. still because i was an idiot i got rid of it. now i know better and a year ago i was thinking about doing the same thing. they are a blast to fool around on. go for it! might still myself...