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1.Size: 12 039; 14' 16'18' 20'
2.Bicycle frame: steel and paint, argon arc welding or CO2 welding Φ22X0.8-1.5mm
3.Bike Fork: Steel and Painted, CO2 Welded Steel/Suspension Fork Φ22X0.8-1.5mm
4.Crank: single crank, CP or ED or UCP;
5.Tightening part of the seat tube: very easy to assemble and tighten;
6.Brakes: F/R caliper brakes or R belt brakes or V brakes or foot brakes;
7.Handlebar and stem: 4-point handlebar, CP, argon arc welding Φ22X0.8-1.5 mm;
8.Tire: 12'x1.75, 16' x1.75, 20x1.75, or 1.95 2.125 2.4 air tire or EVA tire;
9.Saddle: good leather, plain or spring/plastic/faux leather/panel PVC;
10.Rims: 12'14' 16'18' 20'steel alloy or aluminum or plastic;
11.Sprocket and crank:12'24T × 89/1628T × 102/20' 28T × 127 CP/ED
12.Flywheel: 16t/18t/20t brown/black/CP;
13.Fenders: plastic, steel, CP;
14.Chain: full chain or 9-shaped chain cover;
15, pedal: plastic, with reflector, no ball, PP/TPE/alloy;
16.paint: paint;
17.Color: red, black, blue, green, yellow, etc.;
18.Attachments: flag, wheel cover, training wheel, tool box, basket