Shimano Ultegra R8100 Di2 Groupset (Black)

Crisp shifts and unparalleled performance. Ultegra Di2 boasts the same level of shifting and braking as Dura-Ace with only a slight weight penalty. Sometimes referred to as "the working man's groupset," Ultegra provides incredible value without giving up its high level of functionality. Some highlights of Ultegra include the responsive shifts of the ultra-fast rear derailleur and the smooth modulation of Servo Wave brakes. No matter where your road cycling journey takes you, Ultegra Di2 shifting is up for the task.

Features:

• The same performance and ergonomic feel as Dura-Ace
• Ultra-fast and accurate electronic Di2 shifting
• 11-34T cassette provides more range for climbing
• Wireless connection between shifters and derailleurs (wires link the front and rear derailleur to the battery)
• Incredible battery life (over 600 miles on a single charge) 
• Smooth and powerful braking modulation from Servo Wave technology
• 12-speed cassette fits on standard 11 and 12-speed HG freehub bodies
• Groupset includes everything you need – except for the crankset and bottom bracket (which are size-specific)

Specifications:

• Speed: 2 x 12 Speed
• Shift Mechanism: Electronic (Semi-Wireless)
• Brake Type: Hydraulic Disc
• Brake Mount: Flat Mount
• Cassette Drive Type: Shimano HG 11/12
• Cassette Teeth: 11-34T
• Rotors: 160mm (Front), 140mm (Rear)
• Rotor Mount: Centerlock
• Color: Black

Groupset Includes:

• (1) ST-R8170 Left Shifter and Front Brake Caliper (w/ Hose and 160mm Rotor Adapter)
• (1) ST-R8170 Right Shifter and Rear Brake Caliper (w/ Hose)
• (1) RD-R8150 Rear Derailleur
• (1) FD-R8150 Front Derailleur (Braze-On)
• (1) CS-R8101 Cassette (11-34T) (Shimano HG 11/12)
• (1) CN-M8100 Chain
• (1) RT-CL800 Front Rotor (160mm) (w/ Lockring)
• (1) RT-CL800 Rear Rotor (140mm) (w/ Lockring)
• (1) BT-DN300 Battery
• (1) EW-EC300 Charging Cable
• (1) EW-SD300 E-Tube Wire (700mm) (Connects front derailleur and battery)
• (1) EW-SD300 E-Tube Wire (1200mm) (Connects rear derailleur and battery)