儿童的自行车

1)Size.: 12,14, 16 ,18, 20 2)Frame: steel,and painting for kids, down tube 48*1.2mm, front face 33x1.5mm 3) B.B parts:3pcs,B.B Axle, B.B Cup. 4) Brake: F: Calliper brake R:Band brake 5) Tire: 12x2.125 , 16x2.125,  20x2.125 6) Handle bar: 22x1.0mm 7)Chainwheel&cranks:  12 24Tx89, 1628Tx102, 20 28Tx127. ED 8) Pedal: without ball, plastic, with yellow reflector . 9) Saddle: leather , spring 6.0mm . 10) Rim: Aluminium 11) Training wheel/side wheel: thickening 2.5 mm ED 12) Color to order