Shimano 105 Di2 STI ST-R7170 2-/12-speed Shift/Brake Lever

Shimano 105 Di2 ST-R7170 Shift/Brake Lever – 105 goes semi-wireless
ST-R7170 are the first Di2 shift/brake levers from Shimano’s 105 road bike groupset. They combine an electronic 2×12-speed shifting function with a hydraulic brake function. The extended bar end grips make them very ergonomic to hold, especially as you can easily adjust the grip width to your hand size with the help of a 2 mm hex tool. Thanks to the increased braking range and the sensitive lever action, you have full control over all braking processes, and the pressure point is also adjustable. At the same time, the shift/brake levers weigh only about 30 grams per pair more than the Ultegra model. Of course, as before with Dura-Ace and Ultegra, the retreaded Di2 platform is used. This means that the ST-R7170 communicates via a wireless protocol with the rear derailleur, which in turn is wired to the battery and indirectly to the front derailleur. This not only means lightning-fast, highly precise gear changes at the touch of a button. By dispensing with cables on the cockpit, your bike looks tidier, assembly is easier and the shifters & derailleurs are insensitive to dirt at this point. The STI is powered by two button cells that last for several years and can be self-replaced when needed. The brake lever is made of lightweight aluminium, the grip body is made of durable composite material.
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:105 Di2 R7150Application:RoadGearing:2-speed, 12-speedShifting System:electronic, semi-wirelessBrake Type:hydraulicTechnical Information:Brake Lever Material:aluminiumLever Body Material:composite material (GFRP)Hose:SM-BH90-JK-SSR, SM-BH90-J-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-R7150, RD-R8150, RD-R9250Front Derailleur:FD-R7150, FD-R8150, FD-R9250Crank:FC-R7100, FC-RS520, FC-R8100, FC-R8100-P, FC-R9200, FC-R9200-PCassette:CS-R7100-12, CS-R7101-12, CS-HG710-12, CS-R8100-12, CS-R9200-12Chain:CN-M8100, CN-M9100, CN-M7100, CN-M6100Brake Caliper:BR-R7170 (recommended), BR-R8170, BR-R9270, BR-RX820-LEAdditional Brake Lever:BL-RX812
* only for pairing via cable or firmware updates, wired shifting is not supported
Features:tidy cockpit, aesthetic look thanks to wireless connectionwireless shifting, precise and fast (rear derailleur / front derailleur with cabling)CR1632 batteries easy to replace with flat head screwdriver, 3.5 to 4 years runtimeunique ergonomics thanks to feedback from professional ridersfunnel venting with M7 funnel (TL-BR002)firmware updates via E-Tube Projectanodised brake leverTechnology: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 consistently high precision. Attention was also paid to keeping power consumption as low as possible. Cables are only used between the battery and the rear derailleur and between the battery and the front derailleur. These are thinner than the previous models and easier to lay. Shimano relies on a centra