– Pair of controls disc brakes: Shimano Ultegra Di2 ST-R8170 / BR-8170 (Controls 1000/1700 mm hoses Flat Mount calipers with resin pads. J-Kit version.) – Rear derailleur: Shimano Ultegra Di2 RD-R8150 12s – Front derailleur: Shimano Ultegra Di2 FD-R8150 2x12s (braze-on – collar not included) – Crankset: Shimano Ultegra FC-R8100 (50/34T or 52/36T – 170 or 172.5 or 175 mm) – Cassette sprocket: Shimano Ultegra CS-R8101-12 (11-30T or 11-34T) – Chain: CN-M8100 Quick-Link (116 links) – Internal battery: Shimano BT-DN300 – Charging connector: Shimano EW-EC300 (1700 mm) – Internal electronic cable: Shimano EW-SD300-I (1×600 mm 1×1200 mm) – Front and rear disc: Shimano RT-MT800 Center Lock or Shimano RT-CL800 Center Lock (160 mm or 140 mm – internal lockring) ULTEGRA R8100 Di2 DISC GROUP WEIGHT: 2346 gr.