BMX Race Bikes Junior

BMX Race Bikes Junior: bikes in the Junior size class. Top tube approx. 18.5" to 19", for a rider height of approx. 4'3" to 4'9" (130 to 145 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.