座桿 / Seat Post B512-Black B512-Black Forged Aluminum Arms Bar Bore: 31.8mm Weight: 188g B512-Silver B512-Silver Forged Aluminum Arms Bar Bore: 31.8mm Weight: 188g B5101-Black B5101-Black Forged Aluminum Arms Length: 320mm Inner Diameter：31.6mm Weight: 320g
