Shimano Dura-ace ST-R9170 Sti Shift-brake Lever Left Hydraulic 2-SPEED DI2


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  • The Shimano Dura-Ace Di2 shift/brake lever ST-R9170 offers you one more option, namely electronic shifting (2-speed or 11-speed) and hydraulic braking in one (Shimano Total Integration Technology). This means that you have the highly reliable deceleration performance of a disc brake at your disposal in all conditions, while at the same time benefiting from the convenience of Di2 Dual Control technology. Despite the integrated hydraulic system, it was possible to keep the grip horn pleasantly slim and compact. Adjustable grip width and pressure point also benefit ergonomics and usability, while Servo Wave Technology ensures optimum conversion of lever travel into braking power. On the other hand, the intuitive gearshifts with their clear click feel should be emphasized, as well as the diverse customisation options. The E-Tube platform can be used to program the shift steps, switch the multi-shift functions on and off and perform firmware updates. The ST-R9170 STI is made almost entirely of carbon and therefore also knows how to convince with its low weight.


    Series: Dura-Ace Di2 R9150
    Application: Road
    Gearing: 2x
    Shifting System: Electronic
    Brake Type: Hydraulic


    Brake Lever Material: Carbon
    Lever Body Material: Carbon (CFRP)
    Hood Material: Carbon composite
    Hose: SM-BH90-JK-SSR (not included)
    Actuation: Mineral oil
    Mount: Clamp (closed)
    Reach Adjust: Bolt
    Adjustment Options: Reach adjust, contact point


    Clamp Diameter: 23.8 - 24.2 mm
    Power Cable: EW-SD50 (2 x connection)
    Front Derailleur: FD-R9150, FD-R8050, FD-9070, FD-6870, FD-RX815
    Crank: FC-R9100, FC-R9100-P, FC-R8000, FC-R7000, FC-RS510, FC-9000, FC-6800, FC-5800, FC-RS500, FC-U5000-2, FC-RX810-2, FC-RX600-11
    Rear Derailleur: RD-R9150, RD-R8050, RD-9070, RD-6870, RD-RX805, RD-RX815, RD-RX817
    Cassette: CS-R9100, CS-9000, CS-6800, CS-5800, CS-R8000, CS-HG800-11, CS-R7000, CS-HG700-11, CS-M8000-11, CS-M7000-11, CS-M5100-11
    Chain: CN-9000, CN-6800, CN-HG901-11, CN-HG701-11, CN-HG601-11, CN-LG500
    Brake Caliper: TL-BR002
    - CFRP shifter and master cylinder, painted brake lever


    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 extensi
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