Compatibility:
- Clamp Diameter: 23.8 - 24.2 mm
- Power cable: EW-SD300-I (1 x connection)
- Rear Derailleur: RD-R8150, RD-R9250
- Front Derailleur: FD-R8150, FD-R9250
- Crankset: FC-R8100, FC-R8100-P, FC-R9200, FC-R9200-P
- Cassette: CS-R8100-12, CS-R9200-12Chain: CN-M8100, CN-M9100, CN-M7100, CN-M6100
- Recommended Brake Caliper: BR-R8170
- Additional Brake Lever: BL-RX812
- Satellite Shifter: SW-RS801-S, SW-RS801-T (1 x connection via EW-SD300)
Features:
- Tidy cockpit, aesthetic look thanks to wireless connection
- Wireless shifting, precise and fast (rear derailleur / front derailleur with cabling)
- Battery CR1632 easy to replace with flat head screwdriver, 1.5 to 2 years runtime
- Unique ergonomics thanks to feedback from professional riders
- Softer handle cover
- Servo Wave technology for optimal brake control
- 16.4 mm reach adjust
- Wired mounting also possible
- Funnel bleeding
- Firmware updates via E-Tube Project
- Connection with Shimano Connected partner devices from Garmin or Wahoo possible via E-Tube
- Lacquered brake lever and buttons
Technology:
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 central battery located in the seatpost. This increases safety and ensures an uncomplicated charging process via the rear derailleur. Once fully charged, the circuit can be ridden for approx. 1000 km. If desired for peace of mind or other reasons, you can install the groupsets in the conventional way. The components are paired together via the E-Tube platform.
Servo Wave
Servo Wave optimizes the leverage of your brake levers. During the braking process, the brake pads are guided quickly to the brake rotor with very short lever travel. The greater part of the lever travel is reserved for the actual braking force. This technology allows you to control your braking force more precisely and to apply it more effectively.
Models:
- 12-speed
- Mount: right
- Manufacturer Number: I-STR8170RA
Contents:
- 1 x Shimano Ultegra Di2 ST-R8170 shift/brake lever, right rear
- 1 x CR1632 batteries
