Shimano Ultegra Di2 R8170 2x12-Speed ??Groupset

Shimano's Ultegra Di2 shifting systems utilize wireless technology wherever it offers advantages in everyday use as well as in competitive riding. Eliminating the connecting cables between shifters and derailleurs results in a cleaner cockpit and simpler setup. Connecting the rear derailleur and front derailleur to an internal battery ensures a stable power supply and maximum reliability. Included components: Ultegra Di2 ST-R8170 STI brake/shift levers (left + right) Ultegra BR-R8170 disc brake caliper (hydraulic, flat mount, front + rear) Ultegra FC-R8100 crankset Ultegra Di2 FD-R8150 front derailleur (2-speed) Ultegra Di2 RD-R8150 rear derailleur (12-speed) Ultegra CS-R8101 cassette Deore XT CN-M8100 chain (116 links, incl. Quick Link chain connector) Deore XT RT-MT800 brake rotor (Centerlock, 2x160 mm) BT-DN300 battery (integrated) Note: Bottom bracket is not included but can be purchased separately.

Key features of individual components Shimano ULTEGRA Di2 ST-R8170 + BR-R8170 2x12-speed disc brake set The Ultegra ST-R8170 brake/shift levers offer improved ergonomics, wireless shifting, and finely adjustable braking power thanks to SHIMANO SERVO WAVE technology. The BR-R8170 brake calipers are more compact, quieter, and easier to maintain, minimizing brake judder and offering high control and braking power. SEIS – Shimano Electronic Intelligent System SEIS is based on the SIS indexing system but performs shifting operations electronically. This allows for fast and precise shifting at the touch of a button – regardless of weather or cable wear – and the operation remains as familiar as with mechanical dual-control levers.

E-Tube

E-Tube enables robust "plug & play" cabling, is resistant to corrosion, cold, and stretching, and allows for easy updates and settings via the PC interface.

Shimano Shadow RD

The low-profile Shadow design ensures quiet, stable shifting and reduces the risk of impacts to the chainstay – ideal even in harsh conditions.

Shimano ULTEGRA Di2 FD-R8150 Front Derailleur (2x12, Braze-on)

The compact FD-R8150 front derailleur shifts quickly and precisely between the chainrings and is aerodynamically optimized. It works seamlessly with the Di2 platform and offers consistent performance under all conditions.

Shimano ULTEGRA Di2 RD-R8150 Rear Derailleur (12-speed)

The RD-R8150 offers extremely fast, precise shifting and is compatible with 11-34 and 11-30 cassettes. It integrates the wireless unit, charging port, and mode button into a compact housing and forms the central element of the Ultegra Di2 system.

Shimano ULTEGRA CS-R8100 Cassette (12-speed, 11-34)

Thanks to HYPERGLIDE+ technology, the CS-R8100 cassette enables exceptionally smooth shifting – even under high load. It offers maximum efficiency, is compatible with 11-speed HG freehub bodies, and comes in 11-34 tooth configurations.

Shimano XT CN-M8100 Chain (12-speed, Quick-Link)

The CN-M8100 offers smooth operation and precise shifting in both directions, even under high load. The SM-CN910-12 Quick-Link facilitates installation, while optimized contact surfaces and chromed inner plates ensure high durability.

Shimano ULTEGRA FC-R8100 Crankset (2x12)

The lightweight HOLLOWTECH II FC-R8100 crankset offers efficient power transfer and fast, precise shifting performance.

Its new design combines improved stiffness with classic Ultegra aesthetics and is a key component of the 12-speed drivetrain. Compatibility & Technical Details

• Rear derailleur: Compatible with Shimano 12-speed road cassettes (CS-R8100: 11-30 & 11-34)
• Mounting:

– Flat mount for brake calipers – Standard braze-on for front derailleurs – Direct mount/standard mount for rear derailleurs

• Shifting system: Semi-wireless Di2 platform (wireless between STIs & rear derailleur; cable connection battery › RD/FD)
• Chain compatibility: Shimano 12-speed HG+ chains (e.g., CN-M8100)
• Freehub: Compatible with Shimano 11-speed HG road freehub bodies
• Max. Chainring sizes: 50–52 teeth (front derailleur FD-R8150) Brake system: Hydraulic, 2-piston, flat-mount (BR-R8170) Compatible cassette sizes: 11-30T & 11-34T

Shimano SKU Numbers

Shift/Brake Levers (STI): ISTR8170PA (pair) Brake Calipers:

– Front: IBRR8170F – Rear: IBRR8170R

Crankset: IFCR8100DX50 (50-34) Front Derailleur: IFDR8150F Rear Derailleur: IRDR8150 Cassette: ICSR810012134 (11-34) Chain: ICNM8100116Q Battery: IBTDN300 Charging cable: IEWEC300 Shimano Ultegra Di2 groupset without bottom bracket