BMX Race Frames Micro + Mini

BMX Race Frames Micro + Mini: frames in the Micro + Mini size class. Top tube approx. 16" to 18.25", for a rider height of approx. 3'3" to 4'5" (100 to 135 cm). These are guide values; every brand publishes its own chart, and at the boundary it comes down to preference: smaller is nimbler, larger is calmer on the straights.