... size: 12'' 16'' 20'' steel alloy and aluminium 2, High quality and competitive price 3, Fashional design baby bicycle:1,Rim ... size: 12'' 16'' 20'' steel alloy and aluminium2, High quality and competitive price3, Fashional design4, Handlebar and sterm: CP, argon ... × 127CP/ED7, Crank: CP or ED or UCP8, Brake: F/R caliper brake or R brand brake9, Flywheel: 16T/18T/20T brown ...