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Connecting rider to the road, Shimano’s new ULTEGRA R8100 series takes BLUE TOOTH technology to a new level with an ultra-efficient drivetrain, wireless cockpit, new levels of braking control and the fastest shifting ever. This is a partial build kit that includes: Shimano EW-SD300 Wire 1200mm Shimano EW-SD300 Wire 900mm Shimano RT-MT800-S 140mm w/Lock Ring (Internal Spline Type) Shimano RT-MT800-S 160mm w/Lock Ring (Internal Spline Type) Shimano Ultegra Di2 ST-R8170 / BR-R8170 Flat Mount Front Brake Black Shimano Ultegra Di2 ST-R8170 / BR-R8170 Flat Mount Rear Brake Black Shimano Ultegra FD-R8150 2x12 Di2 Braze-On Front Derailleur Shimano Ultegra Di2 RD-R8150 Rear Derailleur GS Black Not included are Shimano FC-R8100 Ultegra Crankset, Shimano BT-DN300 Di2 Internal Battery, Shimano CN-M8100 XT Chain 12sp 126 Links, Shimano EW-EC300 Di2 Charging Cable, Shimano Ultegra CS-R8100 12 Speed Cassette