... painting,argon-arc welding/co2 welding.4.Chainwheel&crank:12"-24T*89,16"-28T*102,the crank length we ... 5mm.the treatment is ED,CP,UCP.11.Freewheel:12"-16T,16"-16T,20"-18T,single speed.heat ... treatment.finish:black or brow,or sliver.12.Mudguard material: plastic or steel,the thickness is 0 ... cover:full,type/F,type/P,0.4mm.14.Training wheel/leg:colourful,enhanced type,the leg thickness is ...