baby bicycle: 1,Rim size: 12'' 16'' 20'' steel alloy and aluminium 2, High quality and ... price 3, Fashional design baby bicycle:1,Rim size: 12'' 16'' 20'' steel alloy and aluminium2, High quality and competitive ... welding 22 × 0.8-1.2mm5, Tyre:12'' × 1.75. 16'' × 1.75, 20'' × 1.75 or 1.95 / 2 ... Crank: CP or ED or UCP8, Brake: F/R caliper brake or R brand brake9, Flywheel: 16T/18T/20T brown/black/CP10 ...