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Shimano Ultegra Di2 ST-6870 11-Speed Shifters

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Item # SHI0659

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Item # SHI0659

Following in Dura-Ace's footsteps.

The second iteration of electronic Ultegra has officially arrived, and this time around the innovative system brings forth many notable Dura-Ace-esque refinements. Aside from the bump to 11-speed, updates to the shifters themselves include a slimmer profile that's more reminiscent of its Dura-Ace sibling, as well as reworked shift levers that are now positioned for easier access from the hoods. The surface texture is also more pronounced, which, in addition to the reworked paddle shapes, provides a more tactile feel for positive shifts from a variety of hand positions. And not to be left behind in the programmability department, the new shifters are also fully customizable through Shimano's E-tube software, meaning that various aspects of shifting are easily tuned to your preferences. It's safe to say the new Ultegra has learned a thing or two from its popular older brother.

The hoods of the Di2 6870 shifters now feature a smaller and slimmer shape compared to the Ultegra Di2 ST-6770 edition. Made from a dual-compound rubber composite, the low-volume hood design retains the slight perforated form of the originals, and makes lever accessibility easy. The lever blades and paddles have also received a sleek redesign. Their outward curve and feel is slightly more pronounced than in the prior generation, and make for a more positive interaction from either the hoods or drops. In terms of the shift buttons, Shimano has widened them and added more contrast in texture, creating an easily navigable shift interface. And when you're buried in the drops on long descents, you'll be happy to know that Shimano has continued to include 10mm of reach adjustment for the levers.

The shifting itself is where 6870 shines the brightest — this is where Shimano's "Rider-Tuned" philosophy really makes itself known. This is the title given to Shimano's campaign of providing you the best rider-experience of your life. The 6870 now enjoys the same fully programmable shifting experience as Dura-Ace 9070, which was only available as a firmware upgrade with the original 6770. This standard feature now enables you to select five different shifting speeds to the rear derailleur. And while this isn't a function that can't be performed on-the-fly, the option still creates a customizable ride quality that's specific to your riding style and requirements. Additionally, these shifters present the distinct ability for something that we've always been waiting for from Shimano — the ability to dump through the entire cassette with one shift movement. That's right, once programmed through the E-Tube software, one sustained motion will take you all of the way up or down the cassette.

Similar to 9070, Ultegra 6870 has eased your shifting options through the incorporation of cleaner, more minimal single-wire E-Tube connections. This way, the positioning of satellite shifters is wide open for either the drops or the top of the bars.

The Shimano Ultegra Di2 ST-6870 11-Speed Shifters are available in one size and in the color Grey. Each pair comes in at a claimed weight of 295g.

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

Tech Specs

Material:
[hoods] dual-compound rubber, [levers] aluminum
Type:
electronic
Crankset Compatibility:
double ring
Compatible Components:
Ultegra Di2 6870, E-tube Di2 technology
Actual Weight:
Gray, 6870: 323g
Recommended Use:
road racing and cyclocross
Manufacturer Warranty:
3 years

Size chart

Shimano

Di2 Reference Guide

 

Note: This reference is meant to be used as a guide for creating a Shimano Di2 drivetrain package. For further assistance please feel free to give us a call.

 

Battery and Wires:

Our Shimano Di2 packages are built for three standard configurations based on battery location and wire routing. First, you'll need to determine if your frame uses an internal or external battery mount, and whether the routing is either internal or external. Below is a guide for which battery, charger, mount, and junction boxes are required for your configuration.

Battery and Wire Configurations
 BatteryBattery ChargerBattery MountJunction AJunction B

External Battery

w/ External Routing

SM-BTR1 SM-BCR1 SM-BMR2 SM-EW90 A/B 3/5 port SM-JC40

External Battery

w/ Internal Routing

SM-BTR1 SM-BCR1 SM-BMR2 SM-EW90 A/B 3/5 port SM-JC41

Internal Battery

w/ Internal Routing

SM-BTR2 SM-BCR2   SM-EW90 A/B 3/5 port SM-JC41

Battery Mounts:

The SM-BMR2 battery mount is available in three configurations -- Long External, Short External, and Long Internal. Both Long versions are to be mounted using the bottle cage mounts, while the Short version is designed for Di2-specific frames with either a chainstay or down tube mounting location.

 

Junctions:

There are two junctions needed for completing your Di2 build -- A and B.  Junction A, SM-EW90, is located at the handlebars and available in both three- and five-port options. The three-port option is intended for standard shifting with a left and right hand shifter. If you have the intention of using Shimano's satellite sprint shifters, or a combination of time trial shifters and shifter/brake levers, the five-port junction box will be the necessary selection.

Depending on your frame specification, Junction B (SM-JC40 or SM-JC41) is located either internally or externally at the bottom bracket area. Accordingly, SM-JC41 is designed for frames with internal wire routing, while SM-JC40 is intended for external wiring options.

 

E-Tube Wires:

For your convenience, we've created wire packages for your Di2 build kit in the sizes Small, Medium, and Large. Below, you'll find which wire lengths are included in each kit. Additionally, we've recommended a kit size based on your frame size.

 E-Tube Wire Length Chart
 SML
Down Tube Wire 700mm 750mm 950mm
Front Derailleur Wire 300mm 350mm 400mm
Rear Derailleur Wire 500mm 550mm 600mm
Battery Wire 300mm 350mm 400mm

 

 E-Tube Wire Frame Size Guide
 SML
Frame Size  47-52cm 53-56cm   57+cm

Please Note:

E-Tube Wire length suggestions are an approximation. 

Reviews & Community

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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.

Avg. ride time: 5h 54m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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.

Avg. ride time: 2h 39m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

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.