Electronic shifting used to be a luxury reserved for the top of the range. Shimano's 12-speed 105 Di2 (R7170) changed that — it brings genuine Di2 performance within reach, which is exactly why we spec it across our road bikes. Here's what you actually get, and why it's the smart place to start.
What is Shimano 105 Di2 (R7170)?
105 has long been Shimano's "groupset for the people" — reliable, well-priced, and good enough that plenty of fast riders never feel the need for more. The R7170 version moves 105 to 12-speed electronic shifting, a real step on from the 11-speed mechanical groupset it replaces. It's the most affordable way into Di2 without giving up the things that matter.
12-speed electronic shifting
It's not just the extra sprocket. Each shift is fast, precise and consistent, whether you're grinding up a climb or sprinting for a sign. The wider 12-speed range makes climbs less daunting and keeps you in the right gear more of the time, so every pedal stroke does more work.
Ergonomic shifters and confident braking
The R7170 shifters borrow their shape from Shimano's higher tiers — a natural grip that's easy to use in full-finger gloves or bare hands. Paired with hydraulic disc brakes, you get controlled, dependable stopping power in all weather, which matters as much on a wet British lane as it does on an unfamiliar descent.
Make it yours with E-TUBE
Through the E-TUBE app you can remap the buttons and fine-tune how the bike shifts — customisation that used to be the preserve of pro racers. Set it up to suit how you ride, then adjust it whenever you like.
105 Di2 vs the alternatives
SRAM's Rival eTap AXS is a capable rival, but 105 Di2 wins on Shimano's proven durability and shift precision. And if you're weighing it against the tier above, our Shimano 105 Di2 vs Ultegra Di2 guide breaks down exactly what the extra spend buys.
The bottom line
105 Di2 isn't a compromise — it's electronic shifting done sensibly, with most of the real-world benefit of the pricier groupsets for a lot less. That's why it's offered across our road bikes, including the Shift. If your budget hasn't stretched to Di2 before, this is the upgrade to make.
Read next:Shimano 105 Di2 vs Ultegra Di2: is it worth the upgrade?
