baby bicycle: 1,Rim size: 12'' 16'' 20'' steel alloy and aluminium 2, High quality and ... Fashional design baby bicycle:1,Rim size: 12'' 16'' 20'' steel alloy and aluminium2, High quality and competitive price3, Fashional ... .2mm5, Tyre:12'' × 1.75. 16'' × 1.75, 20'' × 1.75 or 1.95 / 2.125 air tires or ... , Chain wheel & crank: 12''48T × 89/1628T × 102/20''48T × 127CP/ED7, Crank: CP or ED or UCP8, Brake ...