... Mountain bicycle AF720,21S bicycle1.frame:26"*19"suspension frame,front triangle alloy,rear triangle steel,with water sticker and alloy head badge2.fork:suspension ... .freewheel:Shimano TZ07,index 14-28T9.brake:HL DB450/DB450B,alloy disc brake,F:160,R:16010.chainwheel:24*34* ... clamp,27.2*250L14.shifting lever:Shimano EF50-3L/7R,with lever,21S index15:derailleur:front derailleur TZ30,rear use RD-TX30 ...