Shimano Ultegra DI2 ST-R8170 STI Shift-brake Lever Disc

The disc brake for the Ultegra road bike groupset from Shimano consists of the BR-R8170 and the ST-R8170. 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.

With the Ultegra BR-R8170 brake caliper, the brake pads have more free space than with the predecessor model, which prevents grinding of the brake rotor and reduces noise. The braking power of the two plastic pistons is tuned for competition use, but is just as suitable for leisure and training rides. In addition, BR-R8170 features a simple bleeding process thanks to One-Way Bleeding technology. The two-piece brake caliper is made of lightweight aluminium.

The Ultegra ST-R8170 shift/brake lever is powered by a CR1632 button cell, which lasts at least 1.5 years and which you can replace yourself. It communicates via a wireless protocol with the rear derailleur, which in turn is wired to the battery and indirectly to the front derailleur. Not only do you benefit from lightning-fast gear shifting and a tidy cockpit, but installation is also much easier without cables. Alternatively, you can also use the Dual Control lever wired. The ergonomics have been further optimised compared to previous models, and allow for a very comfortable grip. It is also possible to communicate with the third-party device via special buttons, mediated via the rear derailleur as a wireless unit. In terms of braking performance, this Ultegra STI goes one step further than before: thanks to Servo Wave technology, the full braking power is available to you more quickly, but it can also be better dosed at the same time. In addition to the grip width, you can also adjust the empty travel, both using a 2 mm hex tool. With the help of the completely revised funnel (not included), even the bleed process is no problem. The brake lever of the ST-R8170 is made of lightweight aluminium, while the grip body is made of carbon, which saves additional weight.


FEATURES

Shift/Brake Lever:
- 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 venting with M7 funnel
- 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

Brake Caliper:
- 10% larger brake pad spacing minimises grinding of the brake rotor, less noise development
- braking performance optimally tuned for racing and training use
- 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)


TECHNICAL INFORMATION

Shift/Brake Lever
Brake Lever Material: Aluminium
Lever Body Material : Carbon (CFRP)
Mount: Clamp (closed)
Reach Adjust: Bolt
Adjustment Options: Reach adjust, contact point

Caliper
Mount : Flat mount
Pads : Resin with cooling fins
Design : 2-piece
Calliper Material : Aluminium
Piston Material : Resin
Hose Connection: Straight