Shimano Ultegra Di2 R8170 12 Spd Road Shifter/Disc Brake Kit Get ready for the Science of Speed! With the Ultegra ST-R8170 brake/shift lever combination, SHIMANO is opening a new chapter in the history of its Di2 shifting group. The Ultegra ST-R8170 Di2 brake/shift lever not only supports the new 12-speed drivetrains but also makes the cable connection to the rear and front derailleur unnecessary. An integrated radio transmitter, powered by a CR1632 button cell, sends the shifting commands wirelessly to the rear derailleur as the master unit, which in turn forwards them to the front derailleur. The complex cabling in the cockpit area with junction box and Bluetooth module is now a thing of the past. Cabling is only still needed for additional satellite shifters. However, for friends of wired connections, SHIMANO also offers the option to continue connecting the components with cables instead. For the brake unit, too, the Japanese engineers focus on consistent further development. The hydraulic brake lever has been revised in terms of ergonomics and now impresses with excellent modulation, thanks to Servo-Wave technology. For optimal braking performance in all conditions, the BR-R8170 brake cylinder also ensures easier bleeding, thanks to a bleed screw that is separate from the bleed port. Moreover, the improved brake caliper design promises more clearance for the brake pads, which reduces noise levels and facilitates correct alignment. The J-Kit comes pre-filled and, thanks to the pre-installed olive, allows for easy cutting of the cables as well as cable routing inside the frame, too. Additional bleeding is therefore generally unnecessary. Details: Dual Control shift/brake lever combination for SHIMANO Di2 Road 212-speed shifting systems Electronic Di2 shifting system for fast, intuitive and high-performance gear shifting Supports wireless shifting with compatible Di2 components Di2 wireless chip with low interference, high processing speed and low power consumption Battery-powered: no cables needed in the cockpit Compatible with Synchro-shift: synchronized shifting of front and rear derailleur (different modes can be customized via the app on the rear derailleur) Compatible with Multi-Shift: shift through several gears with just one touch of a button SHIMANO Connected Partners via E-TUBE: control your bike computers, for example from Garmin or Wahoo, by means of the switch buttons Also suitable for wired setup With slot for satellite switch Hydraulic disc brake system Constantly high braking power with little effort even in bad weather conditions Improved lever ergonomics SERVO-WAVE technology for maximum braking performance and outstanding braking power modulation Optimised positioning of the brake pads (10 % more clearance compared to the predecessor model) ONE WAY BLEEDING for quick and easy bleeding FREE STROKE ADJUST bite point adjustment REACH ADJUST lever reach adjustment J-KIT DIRECT version: filled ready for mounting and bled for easy cutting and routing of the hose Technical details: Intended use: road bike, TT, triathlon Material: carbon composite, aluminum (shift/brake lever); aluminum (brake caliper) Compatibility: 12-speed/double Brake lever: ST-R8170 (front wheel: left lever / rear wheel: right lever) Brake caliper: BR-R8170 (Flatmount, 2-piston system (resin), flat design) Brake hose: SM-BH90-JK-SSR Brake fluid: SHIMANO mineral oil Adjustable free stroke: yes Lever reach adjustment integrated (with tool) Hose length: 1000 mm (front wheel); 1700 mm (rear wheel) Brake pads: L03A Ice Tec (with cooling fins), organic Recommended disc rotor: SHIMANO RT-MT800 Maximum disc rotor diameter: 160 mm Slots: 1 SD300 E-Tube port, 1 SD300 port for optional satellite switches Battery: CR1632 Weight brake levers: approx. 391 g (pair) Weight brake calipers: approx. 146 g (front), approx. 136 g (rear) In the box: Front 1 SHIMANO Ultegra Di2 ST-R8170-L STI brake/shift lever double J-Kit Direct 1 SHIMANO Ultegra BR-R8170-L brake caliper for front wheel incl. 1 set of brake pads and insert 1 SHIMANO SM-MA-F-D/D adapter for 140 mm/160mm disc rotor diameter 1 SHIMANO SM-BH90 brake hose (1000 mm) Rear 1 SHIMANO Ultegra Di2 ST-R8170-R STI brake/shift lever 12-speed J-Kit Direct 1 SHIMANO Ultegra BR-R8170-R brake caliper for rear wheel incl. 1 set of brake pads and insert 1 SHIMANO SM-BH90-JK-SSR brake hose (1700 mm).