Bike Frame: steel and painting, thicker argon-arc welding/CO2 welding

3.  Bike Fork: steel and painting, co2 welding steel /suspension fork

4.  Rim: 12" 16" 20" steel alloy or aluminum

5.  Handlebar and stem: CP, argon-arc welding Φ22X0.8-1.2mm

6.  Tyre: 12"x1.75, 16"x1.75, 20x1.75 or 1.95 2.125 air tires or EVA tire

7.  Chain wheel & crank: 12"24T×89/1628T×102/20"28T×127 CP/ED

8.  Crank: CP or ED or UCP

9.  Brake: F/R Caliper Brake or R band brake

10.  Freewheel: 16T/18T/20T Brown/Black/CP

11.  Mudguard: steel, painting or CP

12.  Chain: full chain or 9-form chain cover

13.  Pedal: plastic, with reflector, without ball, PP/TPE/ALLOY

14.  Saddle: good leather, common or spring /plastic/imitation leather/ plate PVC TOP

15.  Grips: PVC/TPR/RUBBER FOAM

16.  B.B parts:3pcs B.B axle B.B cup

17.  Paint: 3X/4X painting

18.  Color: red, black, blue, green, yellow etc. any color you like