A smaller frame gives you more control and maneuverability on the trials. (At least I think so). When do you think a frame becomes too small were your loosing more from lack of power then gaining from maneuverability?
Transition Dirtbag, Kona Roast 2002 and specialized BMX
Depends on your size and your preference. My ideal of a small frame is freaking huge for most people. My idea of a really small frame is a persons typical frame. Hard to say. For me too small is a Kona 15"...kona 17" is decent for djing and trials and 19" is my fr/xc frame size...(all kona sizing)