child bike: 1) Frame: steel, down tube Φ48X1.2mm Front faceΦ33X 1.5mm 2) B.B Parts: 3pcs, B.B Axle, B.B Cup 3) Brake: F: Calliper brake R: Band brake 4) Handle bar: Φ22X1.0mm 5) Tire: 12X1.75 6) Cranks&chainwheel: 12 24T X 89 ED 7) Saddle: good leather 8)Pedal: without ball, plastic and with reflector 9)Rim: steel CP, EVA, Aluminium 10) Side wheel(training wheel): 11) Remarks: full size, from 12-20, optional colors