105 Di2 ST-R7170-R STI Brake/Shift Lever Combination Rear Wheel with BR-R7170 Disc Brake J-Kit Direct

SHIMANO 105 Di2 is here!
With the R7150 series, SHIMANO is also giving the 105 groupset its 12th gear. gear as well as integration into the electronic Di2 system – raising its best-selling road bike groupset to the next level for its 40th anniversary. Electronic shifting thus finally reaches the masses, as do the advantages of the wide 12-speed cassette.

With the 105 ST-R7170 brake/shift lever combination, SHIMANO not only supports the new 12-speed drivetrains, but also cuts the cable connection to the rear derailleur and front derailleur, as it did with the Dura Ace 9250 and Ultegra 8150.
An integrated radio transmitter, powered by two CR1632 button cells, 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.

For the brake unit, too, the Japanese engineers focus on consistent further development. The hydraulic brake lever impresses with outstanding ergonomics and excellent dosing. For optimal braking performance in all conditions, the BR-R7170 calliper promises more clearance for the brake pads thanks to an improved brake body design, 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 2×12-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: synchronised shifting of front and rear derailleur (different modes can be customised via the app on the rear derailleur)
Compatible with Multi-Shift: shift through several gears with just one touch of a button
Hydraulic disc brake system
Constantly high braking power with little effort – even in bad weather conditions
Improved lever ergonomics
Optimised positioning of the brake pads (10 % more clearance compared to the predecessor model)
ONE WAY BLEEDING for quick and easy bleeding
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: aluminium, glass fibre composite
Compatibility: 12-speed/double
Brake lever: ST-R7170-R (rear wheel: right lever)
Brake calliper: BR-R7170 (Flatmount, 2-piston system (resin), flat design)
Brake hose: SM-BH90-JK-SSR
Brake fluid: SHIMANO mineral oil
Adjustable free stroke: no
Lever reach adjustment integrated (with tool)
Hose length: 1700 mm (rear wheel)
Brake pads: L05A-RF Ice Tec (with cooling fins), organic
Recommended disc rotor: SHIMANO SM-RT70, SM-RT64
Slots: 1 EW-SD300 E-Tube port
Battery: CR1632 (2x)
Weight brake levers: approx. 423 g (pair)
Weight brake callipers: approx. 123 g (pair)

In the box:
1 SHIMANO 105 Di2 ST-R7170-R STI brake/shift lever 12-speed J-Kit Direct (right, rear wheel)
1 SHIMANO 105 BR-R7170-L brake calliper for front wheel incl. 1 set of brake pads and insert
1 SHIMANO SM-BH90 brake hose (1000 mm)

Tip:
The corresponding 105 Di2 ST-R7170-L STI brake/shift lever for the front wheel can be found under prod. code 2332773.
The recommended SHIMANO SLX SM-RT70 centrelock brake discs can be found under prod. code 2234568 (lockring with internal teeth) or prod. code 2313818 (lockring with external teeth).