Shimano Ultegra Di2 STI ST-R8170 2-/12-speed Shift/Brake Lever

The Ultegra Di2 ST-R8170 Shift/Brake Lever by Shimano – For a wireless cockpit
The ST-R8170 electronic shift/brake lever from Shimano’s Ultegra Di2 road bike groupset shifts 12-speed or 2-speed wirelessly and brakes hydraulically. It is powered by a CR1632 button cell, which lasts at least 1.5 years and which you can replace on your own. ST-R8170 communicates via wireless protocol with the rear derailleur, which in turn is wired to the battery and indirectly to the front derailleur. Not only do you benefit from lightning-fast gear shifting and a tidy cockpit, but installation is also much easier without cables. Alternatively, you can also use the Dual Control lever wired. The ergonomics have been further optimised compared to previous models, and allow for a very comfortable grip. It is also possible to communicate with the third-party device via special buttons, mediated via the rear derailleur as a wireless unit. In terms of braking performance, this Ultegra STI goes one step further than before: thanks to Servo Wave technology, the full braking power is available to you more quickly, but it can also be better dosed at the same time. In addition to the grip width, you can also adjust the empty travel, both using a 2 mm hex tool. With the help of the completely revised funnel (not included), even the bleed process is no problem. The brake lever of the ST-R8170 is made of lightweight aluminium, while the grip body is made of carbon, which saves additional weight.
Information regarding the return of batteries and electrical equipment:Information on the return and disposal of batteries and electrical equipment can be found here.
Specifications:Series:Ultegra Di2 R8150Application:RoadGearing:2-speed, 12-speedShifting System:electronic, semi-wirelessBrake Type:hydraulicTechnical Information:Brake Lever Material:aluminiumLever Body Material:carbon (CFRP)Hose:SM-BH90-JK-SSR (not included)Actuation:mineral oilMount:clamp (closed)Reach Adjust:boltAdjustment Options:reach adjust, contact pointCompatibility:Clamp Diameter:23.8 – 24.2 mmPower Cable:EW-SD300-I (1 x connection)Rear Derailleur:RD-R8150, RD-R9250, RD-R7150Front Derailleur:FD-R8150, FD-R9250, FD-R7150Crank:FC-R8100, FC-R8100-P, FC-R9200, FC-R9200-P, FC-R7100, FC-RS520Cassette:CS-R8100-12, CS-R9200-12, CS-R7100-12, CS-R7101-12, CS-HG710-12Chain:CN-M8100, CN-M9100, CN-M7100, CN-M6100Brake Caliper:BR-R8170 (recommended), BR-R9270, BR-R7170, BR-RX820-LEAdditional Brake Lever:BL-RX812Satellite Shifter:SW-RS801-S, SW-RS801-T, SW-RS801-E (1 x connection via EW-SD300)Features:tidy cockpit, aesthetic look thanks to wireless connectionwireless shifting, precise and fast (rear derailleur / front derailleur with cabling)battery CR1632 easy to replace with flat head screwdriver, 1.5 to 2 years runtimeunique ergonomics thanks to feedback from professional riderssofter handle coverServo Wave technology for optimal brake control16.4 mm reach adjustwired mounting also possiblefunnel venting with M7 funnel (TL-BR002)firmware updates via E-Tube Projectconnection with Shimano Connected partner devices from Garmin or Wahoo possible via E-Tubelacquered brake lever and buttonsTechnology:STI Dual Control
Shimano Total Integration (STI) means the combination of braking and shifting functions in one lever, which increases safety when riding. By refining the technology, it became possible to make shifting so smooth at the front and rear that they can be triggered with just one finger. Shimano calls such levers Dual Control Levers (DCL).

Digital Integrated Intelligence (Di2)
Di2 systems are the electronic shifting systems from Shimano. They are based on the SEIS, the Shimano Electronic Intelligent System, which takes over the index shifting function from the mechanical components, only via power cables or radio signals and not via a Bowden cable. Shifting is done by simply pressing a button. This has the advantage that no great effort is required, your concentration on the ride is not disturbed and operation is easy even with cold hands. In addition, the electronic gear changes are very fast and highly precise. There is also no risk of a defective circuit due to dirty cables or other problems. You can adjust individual settings via the E-Tube Project, such as adjusting the shifting speed, the number of shifting operations per button press or the Synchro or Semi-Synchro shifting function. Shimano offers an app for this purpose. Gear maintenance and firmware updates are also done via E-Tube, with the bike connected to a PC running the appropriate E-Tube software for more extensive workshop work.

Semi-wireless
The Shimano Di2 12-speed road groupsets in the disc brake version work semi-wirelessly: at the crucial point, namely the interaction between STIs and rear derailleur, the cable is dispensed with, which makes for a tidy cockpit and considerably simplifies assembly. The wireless protocol is extremely fast and reliable, so that the shifting speed reaches a new level – with consiste