Shimano 105 Di2 R7170 2x12-Speed ??Groupset

The Shimano 105 Di2 R7150 is the first 105 groupset with electronic, semi-wireless shifting. Thanks to wireless communication between the STI shifters and the rear derailleur, it offers particularly fast and precise shifting. Only the rear and front derailleurs are still connected to the battery via cable. For the first time, the groupset features a 12-speed cassette, providing a wider gear range and remaining compatible with older Shimano road freehubs. Combined with a modern disc brake system, the R7150 delivers a high-quality, versatile riding experience. Included in the package are a 2x12-speed crankset (34-50), flat-mount disc brakes, rear derailleur, front derailleur, battery, quick-link chain, and an 11-34 cassette. Components included: 105 ST-R7170 | Brake/shift levers (STI, Di2, left + right) 105 BR-R7170 | Disc brake caliper (hydraulic, flat mount, front + rear) 105 FC-R7100 | Crankset 105 FD-R7150 | Front derailleur (Di2, 2x) 105 RD-R7150 | Rear derailleur (Di2, 12-speed) 105 CS-R7100 | Cassette (11-34 teeth) SLX CN-M7101 | Chain (incl. Quick Link chain connector) BT-DN300 | Battery (built-in type) EW-EC300 | Power cable (1500 mm) Note: Brake rotors and bottom bracket are not included but can be purchased separately.

Key features of individual components Shimano 105 Di2 ST-R7170 + BR-R7170 2x12 disc brake set The ST-R7170 offers electronic Di2 shifting for the first time in the 105 series, enabling precise, intuitive gear changes. Reach adjustment and configurable buttons ensure good ergonomics, while the wireless cockpit provides a clean look. The long-life button batteries last for over three years. The BR-R7170 2-piston brake calipers are lighter and more compact, offer increased pad clearance for quiet braking, and are easy to maintain thanks to one-way bleeding. SEIS – Shimano Electronic Intelligent System SEIS is based on the proven SIS indexing system, but performs the shifting process electronically. This allows for effortless shifting at the touch of a button – precise, fast, and independent of weather conditions or cable wear. Operation is similar to mechanical dual-control levers and requires minimal familiarization. E-Tube E-Tube offers flexible plug-and-play cabling, is resistant to corrosion, cold, and stretching, and allows for easy maintenance. Firmware updates can be installed and functions optimized via the PC connection.

Shimano Shadow RD

The Shadow design, with its low profile and robust construction, ensures quiet, controlled shifting and prevents chainstay slap – ideal even for rougher conditions.

Shimano 105 Di2 FD-R7150 Front Derailleur (2x12, Braze-on)

The FD-R7150 shifts precisely between the large and small chainrings and requires no re-trimming. The wireless platform enables fast shifting. Synchronized shifting modes (Semi-Sync or Full-Sync) can be activated via the E-Tube app, where the rear and front derailleurs work together automatically for optimal shifting. Maximum usable chainring size: 50–52 teeth.

Shimano 105 Di2 RD-R7150 Rear Derailleur (12-speed)

The RD-R7150 offers fast, precise Di2 gear changes and is compatible with 11-34 and 11-36 cassettes. The unit integrates the wireless module, charging port, and function button in a compact housing. Battery and connection status can be read via bike computer or smartphone. The low-profile Shadow housing provides additional protection against damage.

Shimano 105 CS-R7101 Cassette (12-speed, 11-34)

The CS-R7101 is the matching 12-speed cassette for 105 Di2 and offers a wide gear range for flat terrain and steep climbs. It is compatible with HG Spline L2 and HG Spline L 11/12-speed freehub bodies.

Shimano CN-M7100 12-speed chain (116 links, Quick-Link)

The CN-M7100 ensures smooth running and clean shifting. Thanks to the SM-CN910-12 Quick-Link, it can be installed quickly and easily.

Compatibility & Technical Details

• Rear derailleur: Compatible with Shimano 12-speed road cassettes (CS-R7101 11-34, CS-HG710 11-36)
• Mounting: Flat mount for brake caliper, standard braze-on for front derailleur, direct mount/standard for rear derailleur
• Shifting system: Semi-wireless Di2 platform (wireless between STI shifters and rear derailleur, cable between battery and rear derailleur/direct mount)
• Chain compatibility: Shimano 12-speed HG+ chains (e.g., CN-M7100)
• Freehub: Compatible with Shimano 11-speed HG road freehub bodies
• Max. Chainring size: 50–52 teeth (front derailleur)

Shimano SKU numbers

Shifter/brake levers: ISTR7170PA (pair) Brake calipers: IBRR7170F + IBRR7170R Crankset: IFCR7100EX50 (34–50) Front derailleur: IFDR7150F Rear derailleur: IRDR7150 Cassette: ICSR710112134 Chain: ICNM7100116Q Battery: IBTDN300 Charging cable: IEWEC300 Scope of delivery: Shimano 105 Di2 groupset without brake rotors and bottom bracket.