Shimano Ultegra R8170 Di2 Disc Brake 12 Speed Groupset

Shimano’s new ULTEGRA R8100 series takes trickledown technology to a new level with an ultra-efficient drivetrain, wireless cockpit, new levels of braking control, new carbon wheel lineup, and the fastest shifting ever

SHIMANO ULTEGRA R8100: Science of Speed
Shimano’s new 12-speed road groups have been engineered to deliver a faster, more reliable, and more intuitive ride experience. In the pursuit of excellence, Shimano dedicated years of research and development to refine the road riding experience. Reconnecting riders with the road, ULTEGRA R8100 is about the joy of leaning into a tight switchback, or the comradery shared amongst friends after a playful day of town line sprints and coffee stops.

Evolved Di2 Platform – Completely redesigned Di2 system delivers Shimano’s fastest shifting ever in a wireless cockpit design

Most Advanced Drivetrain – Optimized 12-speed gearing for unmatched efficiency and Shimano’s proven HYPERGLIDE+ technology for seamless shifting no matter the situation

Refined Interface and Ergonomics – The optimal balance of comfort, aerodynamics, and aesthetics, ULTEGRA offers secure and comfortable ergonomics, a cleaner cockpit aesthetic, and ultimate customization

Enhanced Brake System – Improving braking control, the new ULTEGRA brake system offers a quieter, maintenance-friendly system

SHIMANO ULTEGRA: Evolved Di2 Platform and Technology
ULTEGRA R8100’s new Di2 platform showcases Shimano’s most advanced drivetrain technology and shifting performance to date. Introduced alongside DURA-ACE R9200, the new Di2 platform delivers faster front and rear shifting than ever before so riders can focus on the terrain ahead with total confidence in their shifting performance. Further Di2 refinements include a charging port and D-FLY wireless connectivity integrated into the rear derailleur.

Shimano ULTEGRA R8100 is wired where it makes sense, featuring a central, multi-port battery that supplies stable, long-lasting power to both front and rear derailleurs. New smaller diameter SD300 wires connect directly from the battery to each derailleur, eliminating the need for junctions and simplifying the build process. The central internal battery also simplifies charging and remains secure over the roughest of roads.

SHIMANO ULTEGRA: Advanced Drivetrain Technology
The new R8100 ULTEGRA drivetrain provides faster, smoother shifting with Shimano’s proven HYPERGLIDE+ drivetrain technology. Developed first for mountain bike applications, HYPERGLIDE+ improves shifting both up and down the cassette, even under maximum pedaling load.

The new 12-speed ULTEGRA drivetrain features optimized gearing options for club racers and weekend warriors alike. Engineered for efficiency, Shimano sticks with an 11-tooth small cog on the cassette while optimizing the “sweet spot” gears between the 6th, 7th, and 8th cogs.

And for an easy transition to 12-speed, SHIMANO ULTEGRA R8100 retains compatibly with current 11-speed Shimano freehub bodies. No new standards or proprietary wheel parts necessary.

ULTEGRA offers two cassette ranges, including 11-30 and 11- 34, that deliver wide gear ranges to riders of all levels. Whether climbing, descending, or hitting the flats, ULTEGRA’s gear options encourage steady and smooth pedaling so riders can switch off and enjoy the ride more freely.

The ULTEGRA R8100 drivetrain employs the same 12-speed chain used on the Shimano XT M81000 series, simplifying inventory requirements for retailers and riders.

Shimano ULTEGRA FC-R8100 Road Bike Cranks
FC-R8100 Crank

- HOLLOWTECH II Crank Set

- 2x12-speed

- Chainring combinations:

- 50-34T

- 52-36T



CS-R8100 Cassette

- HYPERGLIDE+ Technology

- 12-speed

- 11-tooth small cog for optimal efficiency

- Optimized “Sweet Spot” Gears for pedaling efficiency

- Compatible with 11-speed freehub bodies

- Cassette Options:

- 11-30T

- 11-34T