... ' X type folding bicycleDouble chain drive,foldable6061 aluminium alloy foldable frameAluminium foldable stem Zheng Xin, 10*1.75tiresHong ... Guang, foldable pedalWheel Top, aluminium cotter,chain wheelKMC,chainSamson, aluminium rimAssess, aluminium hubWu Xing , Fro:caliper brake;Re:Roller brakeColor ...