Shimano Ultegra Di2 STI ST-R8150 2-/12-speed Shift/Brake Levers

The Ultegra Di2 ST-R8150 Shift/Brake Lever Set by Shimano – Cable-connected model for rim brakes
The ST-R8150 electronic shift/brake levers from Shimano’s Ultegra Di2 road bike groupset shift 12-speed or 2-speed by cable and brake mechanically. It scores with fast gear changes that are defined and intuitive thanks to the Shimano index shifting system. Cables are routed from the STIs first to a junction box and then to the battery, which in turn is connected to the rear derailleur and front derailleur. You can also connect the STIs to each other and run a cable from the right shifter to the battery. The ergonomics of the dual-control levers and the bar ends have been further optimised compared to previous models, and allow for a very comfortable grip. You can easily adjust the grip width with a flat head screwdriver. It is also possible to communicate with the third-party device via special buttons, mediated via the rear derailleur as a wireless unit. The brake levers are made of lightweight aluminium, the grip bodies of plastic, 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:electronicBrake Type:mechanicalTechnical Information:Brake Lever Material:aluminiumLever Body Material:composite material (GFRP)Mount:clamp (closed)Reach Adjust:boltAdjustment Options:Reach AdjustCompatibility:Clamp Diameter:23.8 – 24.2 mmPower Cable:EW-SD300-I (2 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-R8100, BR-R8110, BR-RS811-R, BR-R8000, BR-R8010, BR-6800, BR-6810, BR-6700, BR-R9200, BR-R9210, BR-R9100, BR-R9110, BR-9000, BR-9010, BR-7900, BR-R7000, BR-R7010, BR-5800, BR-5810, BR-5710, BR-5700, BR-4700, BR-4600, BR-R3000, BR-3500, BR-R561, BR-R2000, BR-CX70, BR-CX50, BR-CX77, BR-R517, BR-R317, BR-RS305, BR-R650*, BR-R451*, BR-R450*, BR-R550*Satellite Shifter:SW-RS801-S, SW-RS801-T, SW-RS801-E (1 x connection via EW-SD300)
* with reduced braking force
Features:fast and intuitive shifting with clearly defined click-feelbar end shape and surface structure provide optimum grip and braking force transferSLR-EV brake technologyfirmware updates via E-Tube Projectconnection with Shimano Connected partner devices from Garmin or Wahoo possible via E-Tubelacquered 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.
Models:2×12-speed
Gearing:2-speed, 12-speedManufacturer Number:I-STR8150PAContents:1 x pair Shimano Ultegra Di2 ST-R8150 shift/brake levers1 x Shimano BC-R680 1000 mm brake cable1 x Shimano BC-R680 2000 mm brake cable1 x Shimano brake cable housing, 800 mm1 x Shimano brake cable housing, 1800 mm