Shimano Ultegra Di2 ST-6870 11-Speed Shifters

When innovation trickles down.

The Ultegra Di2 ST-6870 11-Speed Shifters look to the innovations pioneered by Shimano’s top-of-the-line Dura-Ace to provide enhanced shifting performance. The new Di2 ST-6870 hoods features a slimmer, Dura-Ace-like profile that offers easy lever accessibility, and the redesigned lever blades and paddles offers more positive interaction from the hoods or drops. Shimano has also widened and re-textured the shift buttons, and the 10mm of reach adjustment for the levers makes shifting effortless when you’re buried in the drops on a long descent or during a sprint finish.

Like Dura-Ace, the Ultegra Di2 ST-6870s now enjoy the same fully programmable shifting technology. E-Tube technology allows you to select five different shifting speeds giving you a customizable ride quality that is specific to your riding style. And with the single-wire E-Tube connection, Shimano makes this a tidy application.

  • Low-profile hoods
  • Sleek, redesigned lever blades and paddles
  • Wider shift buttons
  • 10mm of reach
  • E-Tube technology
  • Reviews
  • Q & A

Robot Bike

  • Familiarity: I've put it through the wringer

Whiiiiiiir Zip Beep Boop Beep

It occurred to me how crazy Di2 is, as I was running a firmware update on my bicycle. When Skynet takes over we Electronic Shifting cyclists are in trouble.

All Jokes aside though. 1600 miles on this drivetrain and not a single issue or adjustment needed. Every shift has been flawless, and barring any unforseen circumstances, like a crash or some good old fashioned garage or transportation mishap, I fully expect go 6000+ miles with no issues. The only drawback I can find, and this is totally a personal preference, but I sort of miss the mechanical drivetrain for no reason other than the simplicity of pushing a lever which pulls a cable which moves a derailleur. I would argue that the Di2 lacks tactile feedback when shifting, but that is just me nitpicking. I rode the battery until it completely died just to see what would happen. At about 1300 miles (this includes plenty of playing with the new group, shifting just to hear the sounds and show off the auto trim) The battery died on my 18 mile commute to work one morning, first the front derailleur refused to shift, after a few more shift button clicks it did shift down into the small ring, and I had about 30+ shifts of the rear derailleur before the system became unresponsive. So 1300 miles, I think it is safe to say a rider would need to be quite negligent to run out of power on accident.
Gathering all of the parts to get this system going is quite different.

Typically for a road bike with the two standard shifters (no climbing or sprint shifters installed) you need 5 eTube wires
2 - 350mm Wires for the Shifters
1 - 500mm Wire for the battery
1 - 500mm Wire for the Front Derailleur
1 - 700mm Wire for the Rear Derailleur
and 1 - 1000mm wire for the downtube
http://www.competitivecyclist.com/shimano-ultegra-di2-wire
Aside from the wiring you will need the upper and lower junction boxes 3 port for a normal road setup, 5 port for a Tri bike, or if you want to add a climbing shifter or Sprint shifters to your build
Upper - http://www.competitivecyclist.com/shimano-e-tube-cockpit-junction-box

Lower is either external or internal - http://www.competitivecyclist.com/shimano-ultegra-di2-junction-box

The Internal Battery - http://www.competitivecyclist.com/shimano-bt-dn110-di2-battery
Plus the needed mounting hardware depending on the internal mounting location.
or
The External Battery - http://www.competitivecyclist.com/shimano-bm-dn100-di2-battery-mount
Be sure not to forget the appropriate battery charger as well because the battery does not ship with one.
Then the shifters - http://www.competitivecyclist.com/shimano-ultegra-6870-sti-shifters
and the Derailleurs
Front - http://www.competitivecyclist.com/shimano-ultegra-6870-front-derailleur
Rear - http://www.competitivecyclist.com/shimano-ultegra-6870-rear-derailleur

Finally, if you want to incorporate the Bluetooth communication so you can firmware update and change shifting settings with your iPad, you will need an additional 150mm eTube wire, and the Di2 Wireless unit - http://www.competitivecyclist.com/shimano-ew-wu101-di2-wireless-unit

*** Those wire lengths are not set in stone, and will vary for certain bikes, and larger or smaller sizes. I would call in if you have any questions about the specific wire lengths for your bike.

Jumping on the Di2 Train

  • Familiarity: I've used it several times

In the world of shift levers, Shimano is doing some of the finest work around. The Di2 version of their venerable Ultegra groupset is no exception and retains their near bulletproof reliability and top-notch ergonomics.

The hood and lever design just straight up feels great in the hands in a variety of positions. Levers are easy to reach from the drops and the hoods are a solid touch point when you need to get out of the saddle.

Shifts are precise and fast when you engage the controls. The buttons are maybe a touch hard to feel if you have thick gloves on, but this is nitpicking at most.

Comfort & Precision!

  • Familiarity: I've put it through the wringer

The Ultegra Di2 shifters have been fantatstic. The hoods are comfortable, and the shifts are precise every time. It's also worth mentioning that you can dial in the speed of your shifts (faster or slower from stock setting) to your liking with the help of your shop.

Comfort & Precision!

Reliable

  • Familiarity: I've put it through the wringer

I purchased a bike with Ultegra Di2 about a year ago. It was my first foray into electronic shifting and it's just flat out reliable. The batteries last forever and you get quality dependable shifting. In the year that I've had it, I have had zero hickups.

Unanswered Question

Is the shape of the hoods any different than the previous version? I currently have the ST-6770, and I'm wondering if the 6870 will be more comfortable on my hands.

Sticking with it!

  • Familiarity: I've put it through the wringer

Building a new bike is always exciting and it's always tempting to try new things. The drivetrain decision was particularly easy this time however, after my previous experience with Ultegra Di2. The light weight and sexy lines of the Dura Ace Di2 group are indeed tempting, but for the cost you can't go wrong with the Ultegra. I have had exactly :::zero::: issues with my previous group other than problems I have inflicted (read: derailleurs are not-crash-proof). This also makes the Ultegra a great option if you race, where close quarters and periodic pavement sampling are a fact of life.

Do the 6870 shifters come with Di2 and...

Do the 6870 shifters come with Di2 and brake cables?

Best Answer

The 6870 shifters will come with brake cables and brake housing. You will need to purchase 2 e-tube cables to run to the junction A box.