Shimano Ultegra Di2 12速油壓碟煞套裝#ST-R8170+BR-R8170,Shimano Ultegra ST-R8170 Shifter - Components,ULTEGRA Di2 DUAL CONTROL LEVER 2X12s,Shimano Ultegra ST-R8170 Shift-Brake Levers with Calipers. Flat Mount - Power Meter City,Shimano Ultegra ST-R8170 Shift-Brake Levers with Calipers. Flat Mount - Power Meter City