Shimano Dura-Ace Di2 STI ST-R9250 Shift/Brake Lever 2-/12-Speed

The Dura-Ace Di2 ST-R9250 Shift/Brake Lever by Shimano – Cable-connected rim brake model
The ST-R9250 electronic shift/brake lever from Shimano’s top Dura-Ace Di2 road bike groupset shifts 12-speed or 2-speed by cable and brakes mechanically. Both the brake lever and the grip body are made of carbon, which saves over 30 grams of weight per side compared to the Ultegra model. ST-R9250 scores with fast, intuitive and defined shifting processes thanks to the Shimano index shifting system. Cables are routed from the STI 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 lever and the bar ends have been further optimised compared to previous models, and allow 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.
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:Dura-Ace Di2 R9250Application:RoadGearing:2-speed, 12-speedShifting System:electronicBrake Type:mechanicalTechnical Information:Brake Lever Material:carbon (CFRP)Lever Body Material:carbon (CFRP)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-R9250, RD-R8150, RD-R7150Front Derailleur:FD-R9250, FD-R8150, FD-R7150Crank:FC-R9200, FC-R9200-P, FC-R8100, FC-R8100-P, FC-R7100, FC-RS520Cassette:CS-R9200-12, CS-R8100-12, CS-R7100-12, CS-R7101-12, CS-HG710-12Chain:CN-M9100, CN-M8100, CN-M7100, CN-M6100Brake Caliper:BR-R9200, BR-R9210, BR-R9100, BR-R9110, BR-9000, BR-9010, BR-7900, BR-R8100, BR-R8110, BR-RS811-R, BR-R8000, BR-R8010, BR-6800, BR-6810, BR-6700, 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 transferlow weight thanks to carbon brake leverSLR-EV brake technologyfirmware 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.
Models:2-speed
Mount:leftManufacturer Number:I-STR9250L
12-speed
Mount:rightManufacturer Number:I-STR9250RContents:1 x Shimano Dura-Ace Di2 ST-R9250 Shift-/-Brake Lever