SHIMANO 105 Di2: 12 speeds and wireless transmission for everyone

SHIMANO 105 Di2: 12 speeds and wireless transmission for everyone

By William ROBERT
Wednesday, June 29, 2022 6:00 p.m. – News

– This article has been read 16162 times. Comments: 10 .

Celebrating its 40th anniversary since its first appearance in 1982, SHIMANO’s 105 groupset receives the ultimate evolution with Di2 electronic shifting. An electronic version that was long awaited. The Shimano 105 R7100 groupset not only brings Di2 performance to a whole new category of riders, but also offers a wireless 12-speed transmission with simplified use and increased reliability at an attractive price.

Riders who are used to using mechanical drivetrains can now experience the technology and innovations inherited from recent Dura-Ace and Ultegra groupsets. The Shimano 105 Di2 groupset is the culmination of years of research and development, where reliable wireless shifting, extra gear and an exceptional braking system mark a new era in performance accessible to all.

Source: press release

SHIMANO 105 Di2: the science of speed

This group will be available from this fall of 2022. So there’s no need to run to your bike dealer right away or look for it on the Internet.

With its revolutionary “Digital Integrated Intelligence” (Di2) electronic shifting system launched in 2009, this latest version of the Shimano Di2 platform features notable improvements, including a wireless cockpit and 12-speed shifting.

All of this has been done without any sacrifice for fast, precise and reliable shifting, which all cyclists expect from their Shimano groupsets. Shifting is simple and consistent all the time, every time.

This 105 Di2 group seems to take over, at least by its format, the motor on the front derailleur of the old Ultegra Di2.

  • An Evolved Di2 Platform – A completely redesigned Di2 system offering fast shifting in a wireless cockpit design.
  • The most accomplished drivetrain – Optimized 12-speed shifting for unrivaled efficiency and flawless shifting.
  • Redesigned interface and ergonomics – With an optimal balance between comfort, aerodynamics and aesthetics, the Shimano 105 offers better handling, comfortable ergonomics and an even more streamlined cockpit.
  • Improved Braking System – Shimano’s new 105 braking system offers a quieter, more responsive and easy-to-maintain package.
  • New carbon wheels – Combination of aerodynamics, stiffness, lightness and an affordable price for a carbon wheel and compatible tubeless.

Wireless where it matters most

The Shimano 105 Di2 uses a hybrid system, consisting of a wireless cockpit combined with a wired connection between a single battery stored in the seat tube and the front and rear derailleurs, guaranteeing absolute reliability in all conditions. And just like the DURA-ACE and ULTEGRA, the Shimano 105 Di2 drivetrain is customizable using the E-TUBE PROJECT app on your smartphone.

With E-TUBE PROJECT, you can configure your transmission as you wish, adjust the speed of the shift, select the number of gears changed by a simple action on the control, and use the functionality of synchronized or semi-synchronous shifting. synchronized.

You can also connect your drivetrain with most cycling computers including Garmin and Wahoo that allow you to track selected gear or battery status.

Battery life is also best in class. A single charge from the main Di2 power source provides nearly 1,000 km hassle-free. And unlike other electronic drivetrains, there’s only one battery to charge and you don’t have to remove it from the bike to do so. (The smaller, replaceable CR1632 button cell batteries in shifters last 3.5 to 4 years.)

Redesigned interface and ergonomics

The new Dual-Control Shimano 105 levers offer unparalleled ergonomics and design following feedback from professional cyclists. Raised hand rests and a new lever shape improve comfort and control in all riding positions. Braking is also optimized thanks to a smoother lever movement, for greater softness or modulation of the brakes.

The new controllers work with an exclusive Shimano wireless connection that offers fast processing speed and low power consumption. Compare that with other wireless platforms and you get a significant decrease in the likelihood of interference, faster gear changes, and extended battery life.

By using a single rechargeable battery housed in the frame, charging is simple and the battery is protected, ensuring stable and reliable shifting at all times.

ST-R7170 controls

  • Wireless Di2 connection
  • Dual-Control 2×12-speed levers
  • Raised hand rest for improved ergonomics and aerodynamics
  • Shifting control palettes

Advanced transmission technology

Switching to a 12-speed cassette, the Shimano 105 R7100 groupset offers smooth and progressive shifting. This is the result of an optimization of the most used gears. Cassette options are 11-34 and 11-36, and 50-34 and 52-36 tooth chainsets. The combination of the two results in hyper-versatile gear ratios, with a 1:1 ratio.

The new Shimano 105 Di2 components are backwards compatible with 11-speed freehub bodies, meaning they can be used on Shimano 11-speed wheels.

As can be seen opposite, the crankset takes up the design of the Ultegra R8100 model.

FC-R7100 Footswitch

  • HOLLOWTECH II cranks
  • 2×12 speed
  • Possible combinations: 50-34 and 52-36 teeth (available later).

Cassette CS-R7100

  • 12 speeds
  • Departure 11 teeth for a fluid staging
  • New optimized 12-speed gearing
  • Compatible with 11-speed freehub body
  • 11-34 bumps

Cassette CS-HG710-12

  • 12 speeds
  • Departure 11 teeth for a fluid staging
  • Compatible with 11-speed freehub body
  • 11-36 teeth (available later)

RD-R7150 rear derailleur

  • SHIMANO SHADOW Technology
  • Integrated D-FLY connectivity
  • 12-speed Di2 technology
  • Compatible with 11-34 and 11-36 tooth cassettes

FD-R7150 front derailleur

  • 12-speed Di2 technology
  • Quick and precise chainring change

SHIMANO 105 Di2: Improved braking

Like the latest DURA-ACE and ULTEGRA drivetrains, the new Shimano 105 features a quieter braking system that’s easy to maintain, and offers more control and power. Key improvements are shorter lever travel to get to contact point faster and a 10% increase in clearance between pads and rotor to reduce noise.

Mechanics will appreciate the simplification of the bleed system which is done without removing the caliper from the frame thanks to a separate bleed screw and valve screw.

Brakes BR-R7170

  • Refined control and silent system
  • +10% space between pads and disc
  • Simplified bleeding

Shimano 105 Di2 component weights and prices



















Making up price
Pedalboard €182.99
12V Di2 rear derailleur €274.99
Di2 front derailleur €154.99
Front full disc brake €362.99
Rear full disc brake €362.99
Di2 front lever €274.99
Di2 rear lever €274.99
Front disc brake caliper €82.99
Rear disc brake caliper €82.99
Cassette 12V 11-34 €72.99
Full group rate 1870€

















Making up Weight
Pedalboard 765.6g
12V Di2 rear derailleur 302g
Di2 front derailleur 142g
Levers (pair) 423 grams
Brake lines 110g
Brake calipers (pair) 282g
Cassette 12V 11-34 361 grams
Battery 53 grams
Rotors 285.6g
Cables 19 grams
Chain 252 g
TOTAL 2995.2g

New RS710 carbon wheels

With this in mind to make the latest technologies accessible, Shimano is also launching two pairs of carbon wheels: the C32 for climbing passes and the C46 for versatile use. Both share the DNA of the C36 and C50 Dura-Ace and Ultegra wheels, a perfect balance between aerodynamics, lightness and rigidity.

The C32 model is characterized by a 32mm high rim, 21mm wide and a weight of 1502 g. The C46 version has a 46mm high rim, 21mm wide for 1610 g. These wheels are 11 and 12 speed compatible, tubeless and benefit from an attractive design.

WH-RS710-C32-TL

  • Lightweight wheels for rides where acceleration is essential
  • 665g for the front wheel, 839g for the rear wheel
  • 21mm wide, tubeless rim

WH-RS710-C46-TL

  • Versatile wheels for breakaways and more
  • 719g for the front wheel, 893g for the rear wheel
  • 21mm wide, tubeless rim

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