I find myself in possession of a nice little 24" (507mm) rear wheel. The Doctor Frankenbike wants to see if I can make it work on a spare frame I have. It has discs, so brake reach is not a problem. The only issue I can anticipate is pedal strike.
So, at its lowest point, how low of a pedal can I get away with? For street use and maybe some light trail.
I have also been eyeballing my 29er Karate Monkey to see if I can make a 49er (copyright, 2009, Jim) out of it. For weirdness sake it has its appeal, but I don't think it will work.