105 R7100 Di2 12 Speed Road Bike Groupset

The new Shimano 105 Di2 brings electronic gearing to a more entry-level market making it more affordable. Get huge benefits with smoother gear shifting, gear ratios made for all-round riding, no more brake rub, and more. Shimano has refined many aspects of their groupsets over the years. Every new generation solves a wide range of issues from the previous generation.

Shimano 105 Debut. The new Shimano 105 brings Di2 shifting to a new set of riders. For those who have only experienced mechanical shifting and ergonomics, Shimano 105 Di2 represents a transformation of the road cycling experience. With function and technologies inherited from Dura-Ace and Ul;tegra, Shimano 105 is the culmination of years of research and development. With a shared Di2 platform, sophisticated ergonomics, Shimano 105-opptimized gear combinations, and an exceptional brake system, the new Shimano 105 marks a new era of affordable performance.

Ride-changing technology where you are always in control! Shift with absolute ease. Worry-free shifting in a compact size and never skip a shift as you fatigue or encounter an unexpected climb. The difference made over the course of a ride, saving you energy with every gear change, allowing you to focus on the scenery, your effort, and your friends. The all-new lever shape brings comfort and control in every riding position. Easier on the hands. Comfortably compact hoods. Short-travel shifting which saves energy and focus by quickly adapting to ever-changing conditions with a button press instead of many manual shifts. Shifting is automatically completed at the touch of a switch, eliminating the need for the amount of stroke required for mechanical shifting. The rider can shift into the most appropriate gear at will, depending on the ever changing conditions, speed and road surface. This is a great advantage not only in the world of racing, but for all cyclists. A drivetrain for diverse riders.

Helping you meet the road with 12 speed gearing and low-climbing ratios. Here is the low gear that you’ve always wanted. Shimano 105’s sub-1:1 ratio 12 speed range is a tool that lets riders take on steeper slopes and better control their effort along the way.

Shimano synchronized shift. One-hand shifting that can be personalized to match your riding style. Enjoy simple, one-hand control as the front derailleur is automatically kept in synchronization with the rear for consistently efficient pedalling and stress-free shifting. You can personalize it to match your riding style in the E-Tube Project App.

• Optimal balance of stiffness, strength, weight and rotational performance
• HOLLOWTECH II structure cuts weight yet maintains strength for better power transfer
• Crank arm length: 160, 165, 170, 172.5, 175 mm
• Gear combination: 50-34T, 52-36T
• Q-factor: 148 mm

Is Shimano going to release mechanical 105 groupsets?
Shimano has not mentioned any mechanical groupsets for the latest generation of groupsets. We're expecting Tiagra to become the new go-to mechanical groupset.

Is Shimano still making rim brake groupsets?
Shimano is fazing out rim brakes from their road groupsets entirely. Their is no word about rim brakes for the new 105, Ultegra, or Dura-Ace. Many road bike manufacturers have announced that all their future models will be disc brake only.

What is the release date for the new 105 Di2 12 speed?
Our first stock of the Shimano 105 Di2 12 speed groupset arrived on Friday the 30th of September. Stock availability is limited so we recommend ordering soon, before we run out of stock.

Electronic shifting is slowly taking over the gear shifting market. It's offering a more reliable solution that doesn't suffer from cable stretch. The perfect electronic tuning is more accurate than a mechanic derailleur could ever be. The buttons instead of shift levers makes your shifting quicker and more accurate. We're expecting electronic gearing from Sram and Shimano to take over the high-end road bike market over the next couple of years.
Di2 also offers more options such as synchronised shifting. This allows the rider to stop worrying about their front derailleur and allows the smart automated system to automatically shift as required.

Other than weight, how does 12 speed 105 differ from it's Ultegra and Dura-Ace counterparts?
Ultegra and Dura-Ace have Shimano's Servo Wave pivot mechanism which gives greater modulations over braking.

Shimano's latest Hyperglide+ shifting technology in their chains and cassettes makes shifting faster and sharper, particularly under load. These massive improvements allow you to shift while going uphill with much less worry. This is not available in Shimano's 105 parts.
Shimano has refined their Ultegra and Dura-Ace derailleurs to be more compact with faster and more accurate shifting. 105 is largely using trickle-down tech from last generation.
There are certainly more differences which and all are expected 105 is here to offer a more affordable Di2 while Ultegra and Dura-Ace are here to offer the latest technology and performance enhancements.

Shimano mentions more brake clearance, what's this about?
Road disc brakes have long been suffering from brake rub. For some people, it always came back no matter how many times they fixed it. Taller riders found the flex through their bike caused rub, some people found they were getting grit in their caliper every ride.
Shimano has changed their brake caliper to offer more clearance solving these ongoing issues.

How much does the groupset weigh?
The groupset weighs just over 3kg unpackaged which makes it ~360g heavier than the new Ultegra and ~560g heavier than the new Dura-Ace.
All these values are from Shimano and we have not weight them ourselves.