Shimano ULTEGRA R8150 DI2 12-SPEED Groupset The evolution of electronic shifting The new generation of Shimano's famed Ultegra groupset has arrived. Introducing the Ultegra R8150 Di2 Groupset. This 12-speed system utilizes Shimano's ultra-quick, ultra-precise Di2 shifting system and their newest Hyperglide+ drivetrain technology for accurate shifts at the press of a button. This mostly wireless system allows for a fully wireless cockpit for a cleaner look and for easy use with an integrated handlebar and stem. This completely-updated Ultegra Di2 R8150 system shifts faster and with more precision than previous generations, and features refinements to everything from hood ergonomics and button location, to brake bite point and performance. This special groupset includes nearly everything you need to get a new bike build rolling, or to upgrade an existing bike, including shifters, derailleurs, crankset, cassette, and more. Features Complete groupset provides the major drivetrain components needed for many builds Di2 wireless cockpit with wireless shifters for a nearly effortless handlebar setup, especially with integrated cockpits Faster, more accurate shifting with the fastest Di2 shifting system Shimano has ever made Ice Tech Freeza brake rotors and improved brake caliper and lever design for cooler, more predictable braking Hyperglide+ technology for faster shifts, better chain engagement, and a smoother pedaling feel than ever before Specifications Shift Lever ST-R8170 - Ultegra Di2Brake Caliper BR-R8170 (F&R) - (1000mm/1700mm Hose F&R), Metallic Pads w/fin Rotors SM-RT800 - 160mm (1) & 140mm (1), Centerlock, Internal Serration Rear Derailleur RD-R8150 - Ultegra 12-speed, Shadow Design, Direct-Mount Type Front Derailleur FD-R8150 - Down-swing, braze-on type, for 46-52t top gear, 44. 5mm chainline Crankset FC-R8100 - 172. 5mm, 52/36t Bottom Bracket SM-BBR60 - BSA Threaded Cassette CS-R8100 - Ultegra 12-speed, 11-30t Chain CN-M8100 - 138 links, Hyperglide 12-speed Battery BT-DN300 - Built-in type Wiring2 EW-SD300 E-Tube wires - 1x 1200mm, 1x 750mm Charging Cable/Dock EW-EC300, 1500mm | Shimano | Ultegra R8150 Di2 12-Speed Groupset 172. 5Mm 52/36T