Shimano 105 R7170 Di2 2×12 Complete Road Groupset – Electronic Shifting & Hydraulic Disc Brakes

The Shimano 105 R7170 Di2 2×12 road groupset brings electronic shifting and hydraulic disc braking to club rides, sportives and everyday adventures. With a choice of chainring combinations and cassette ranges, you can build a setup that feels comfortable on familiar roads and gives you lower gears for hillier days.

Moving to electronic shifting can give a familiar bike a fresh feel. The Bike Lab can help you work out what’s worth keeping and where a change will make a difference, with personal advice throughout your upgrade. Every order supports an independent bicycle business built around keeping good bikes riding well.

Built for the road

Di2 delivers precise, repeatable gear changes at the touch of a button. The shifters communicate wirelessly with the rear derailleur, while both derailleurs connect to an internal rechargeable battery. This keeps gear cables out of the cockpit while providing a shared power supply for the drivetrain.

Automatic front-derailleur trim helps reduce chain rub as you move through the cassette. Shimano’s E-TUBE PROJECT Cyclist app lets you personalise compatible button functions and choose manual, semi-synchronised or synchronised shifting.

Adjustable lever reach helps you find a comfortable hand position, while Shimano 105 hydraulic disc brakes provide controlled braking on descents and in changing conditions.

What’s included

• Shimano 105 ST-R7170 left and right Di2 shift/brake levers
• Shimano 105 BR-R7170 front and rear hydraulic disc brake calipers
• Shimano 105 RD-R7150 12-speed rear derailleur
• Shimano 105 FD-R7150 front derailleur
• Shimano 105 FC-R7100 HOLLOWTECH II double crankset
• Shimano 12-speed cassette in your selected ratio
• Compatible Shimano 12-speed chain
• BT-DN300 internal rechargeable Di2 battery
• EW-EC300 charging cable
• Two EW-SD300 electric wires

Choose your setup

Crank lengths: 160, 165, 170, 172.5 or 175mm.

Chainrings: 50/34T or 52/36T.

Cassette: 11–34T or 11–36T.

Optional rotors: choose no rotors, two 160mm rotors, or a 160mm front / 140mm rear pair. Rotors are included only when a rotor option is selected.

Compatibility and support

Requires a suitable road frame with flat-mount disc brake mounts, compatible front and rear derailleur fittings, and a freehub suitable for the selected Shimano 12-speed road cassette. Your frame must accommodate the internal Di2 battery and derailleur wiring.

The crankset uses a 24mm spindle and requires the correct HOLLOWTECH II-compatible road bottom bracket for your frame. Rotor mounting and permitted rotor sizes must also suit your wheels, frame and fork.

Bottom bracket sold separately. No power meter included.

For help choosing gearing or checking your current bike, get in touch with its make, model, year and existing setup. The Bike Lab can help you work through the details before ordering.

UK delivery only.