105 BR-R7170 + Di2 ST-R7170 Disc Brake - OEM - black/front

Shimano 105 BR-R7170 + Di2 ST-R7170 Disc Brake - OEM

Item number: 89866

Shimano 105 Disc Brake with BR-R7170 caliper and ST-R7170 Di2 shift/brake lever

The disc brake for the 105 road bike groupset from Shimano consists of the BR-R7170 and ST-R7170. These are a flat-mount brake calipers for front or rear and an electronic shift/brake lever that enables wireless 2-speed or 12-speed shifting and hydraulic braking. The set includes organic brake pads, which contribute to improved heat dissipation with their Ice Tech cooling fins, a brake hose as well as connection material.

The 105 R7170 disc brake caliper has 10% more brake pad clearance than its predecessor model. This minimises the likelihood of grinding noises and thus results in a quieter braking process. The powerful, excellently controllable braking power ensures reliable deceleration and brings you to a safe stop in all conditions. You also benefit from the user-friendly bleeding process, also known as One-Way Bleeding. With its flat mount design, the two-piece aluminium brake caliper also blends in perfectly with the overall appearance of your bike. By the way, the R7170 does not weigh more than the comparable Ultegra model.

The 105 ST-R7170 Di2 shift/brake lever has an upwardly extended grip bar end which offers a very ergonomic hold. In addition, 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.

OEM Packaging:
This item comes from the original equipment manufacturer and is lacking the retail packaging.

Information regarding the return of batteries and electrical equipment:

Information on the return and disposal of batteries and electrical equipment can be found here.


105 R7100
2x, 12-speed
Shifting System:
electronic, semi-wireless
hydraulic, 2 pistons
mineral oil
Hose Length (Front/Rear):
1000 mm / 1700 mm

Technical Information - Shift/Brake Lever:

Brake Lever Material:
Lever Body Material:
composite material (GFRP)
clamp (closed)
Reach Adjust:
Adjustment Options:
reach adjust, contact point

Technical Information - Caliper:

flat mount
resin with cooling fins
Calliper Material:
Piston Material:
Hose Connection:


Shift/Brake Lever:
Mounting Position:
left for front brake caliper, right for rear brake caliper
Clamp Diameter:
23.8 - 24.2 mm
Power Cable:
EW-SD300-I (1 x connection*)
Rear Derailleur:
RD-R7150, RD-R8150, RD-R9250
Front Derailleur:
FD-R7150, FD-R8150, FD-R9250
FC-R7100, FC-RS520, FC-R8100, FC-R8100-P, FC-R9200, FC-R9200-P
CS-R7100-12, CS-R7101-12, CS-HG710-12, CS-R8100-12, CS-R8101-12, CS-R9200-12
CN-M8100, CN-M9100, CN-M7100, CN-M6100
Additional Brake Lever:

* only for pairing via cable or firmware updates, wired shifting is not supported

Brake Caliper:
Brake Rotor:
140 mm, 160 mm, 180 mm (recommended: SM-RT70, SM-RT64)
organic and sintered; with narrow pad shape; standard and Ice Tech brake pads


Shift/Brake Lever:
  • tidy cockpit, aesthetic look thanks to wireless connection
  • wireless shifting, precise and fast (rear derailleur / front derailleur with cabling)
  • CR1632 batteries easy to replace with flat head screwdriver, 3.5 to 4 years runtime
  • unique ergonomics thanks to feedback from professional riders
  • funnel venting with M7 funnel
  • firmware updates via E-Tube Project
  • anodised brake lever

Brake Caliper:
  • 10% larger brake pad spacing minimises grinding of the brake rotor, less noise development
  • coherent appearance and easy tool access thanks to flat mount
  • optimised heat dissipation with Ice-Tech
  • simple bleeding process
  • 2 pistons made of synthetic resin
  • painted
  • steel bolts (4 mm)


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.

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. The components are paired together via the E-Tube platform.

One Way Bleeding
One Way Bleeding is a technique used on Shimano calipers that facilitates brake bleeding. The hose routing has been optimised so that no air bubbles remain in the brake calliper. In combination with the funnel, the brake can be bled cleanly and easily.

Manufacturer Numbers:



  • 1 x Shimano 105 BR-R7170 + 105 Di2 ST-R7170 disc brake, front or rear
  • 1 x Shimano SM-BH90-JK-SSR brake hose, 1000 mm (front) or 1700 mm (rear)
  • 1 x pair Shimano resin brake pads with cooling fins
  • 1 x disc brake adapter for front 140/160 + 160/180 mm (only for front)
  • 1 x hose connection sets
  • 2 x type A caliper bolts (front)
  • 2 x caliper bolts for 25 mm frame diameters (rear)
  • 2 x CR1632 batteries
  • ready for installation, filled, bleeding is recommended after installation

Order Together:

Optional accessories:

  • 100 day return period
  • Online since 1998
  • Trusted Shop 4.89 / 5.00


  • black/front, in stock
  • black/rear, in stock

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