Equipment > Components > Groups > Road
Description
Flagship technology at a more accessible price point has always been Ultegra's role in Shimano's road hierarchy, and the R8100-series delivers on that promise with the same semi-wireless Di2 architecture that debuted on Dura-Ace. The Shimano Ultegra R8170 Di2 12-Speed Kit packages the core shifting, braking, and gearing components for a hydraulic disc build, with coin cell-powered shift levers communicating wirelessly to derailleurs that wire back to an internal battery. This is a partial kit covering the Di2 system and drivetrain essentials, so you'll still need a crankset, bottom bracket, disc rotors, and SD300 e-Tube wires to complete the build.
The mechanical version of 12-speed Ultegra doesn't exist. Shimano made the decision to offer R8100 exclusively as Di2, which means this kit represents the entry point for Shimano's current-generation road shifting technology. The performance gains justify the commitment: 58% faster rear shifting and 45% faster front shifting compared to the previous wired Di2 generation. Those improvements come from redesigned servo motors and the elimination of signal latency that wired connections introduced between levers and derailleurs.
The ST-R8170 shift/brake levers run on CR1632 coin cell batteries and communicate wirelessly with the rear derailleur, which coordinates front derailleur movement. This architecture eliminates the need to route e-Tube wires through your handlebars and stem, which dramatically simplifies builds on frames with integrated cockpits. The lever hoods are 4.6mm longer than the previous generation with a slight inward curve for a more secure grip, and each lever includes an SD300 port if you want to add satellite shifters for sprint or TT positions. The accessory button on top of each hood handles customizable functions through the e-Tube app.... Read More
Features
- Ultegra R8100-series 12-speed Di2 partial groupset
- ST-R8170 wireless Di2 shift/hydraulic brake levers (CR1632 coin cell powered)
- BR-R8170 flat mount hydraulic disc calipers with ServoWave action
- FD-R8150 front derailleur (braze-on, 33% smaller frontal area)
- RD-R8150 rear derailleur with integrated charging port and D-Fly
- BT-DN300 internal seatpost battery (3.7Wh, three SD300 ports)
- EW-EC300 USB-A magnetic charging cable included
- CS-R8100 cassette in 11-30T (291g) or 11-34T (345g), all-steel cogs
- CN-M8100 12-speed chain with Quick-Link
- 58% faster rear shifting, 45% faster front shifting vs. previous Di2
- Still required: crankset, bottom bracket, disc rotors, SD300 e-Tube wires (2)