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True enough, Dura-Ace Di2 made a big splash when it was introduced. But Shimano's unveiling of Ultegra Di2 has us perhaps even more excited. Any skepticism we may have had before the original electronic release is long gone. After riding it we know Shimano's system works, and we know that it's a huge upgrade over the comparable mechanical drivetrains. Ultegra Di2 promises to be as groundbreaking as STI was in the first place to change the way we shift our bikes. These Ultegra Di2 ST-6770 STI Shifters are the heart and soul of the system along with the front and rear derailleurs.

The most obvious advantage to going electronic is that there are no cables. No cables = no friction. Also, the system makes fast shifts up or down the range, front and rear. Each shift is the same. Every time. And when you're about to attack or simply following wheels over the top of a climb, you'll appreciate the consistency. Better still, the shifting feel is much lighter. You can do it when you're tired. You can do it with "weak" fingers. You don't have to move your wrists or forearm. And by eliminating the cables and housing, you can kiss cable maintenance goodbye. Never again will your shifting performance degrade over time until you find yourself on a long ride, fumbling with your cable tension to quiet the racket emanating from your rear derailleur/cassette.

Unlike mechanical Ultegra Shifters, the Di2 brake lever doesn't swing sideways to shift. Instead there are two paddles behind the carbon-fiber lever blade. The one closer to the handlebar still does the traditional shifting with the spring (onto smaller cogs in the rear and onto the small ring in the front), and the one further away does the traditional shifting against the spring (onto taller cogs in back and onto the big ring in front). Each button has 2mm of travel, and is as easy to use as a mouse click. Each click of the button results in one shift. If you're coasting, you can "pre-shift" any number of gears, and the system will take up the shifting when you start pedaling.

By going electronic, Shimano was able to re-shape the lever body. They're slimmer, closer to pre-STI levers, with some more ergonomic refinement. Shimano shaved down their profile because they don't need to allow for derailleur cable routing and the internal hardware it takes to precisely shift the cables. Couple the new profile with the easy-to-adjust brake lever reach, and this makes Di2 a great choice for those with smaller hands. Have no fear if you have man hands, Shimano didn't hack away any of that prime real estate on the top of the perch that you know and love. And while Di2 isn't really about weight savings, these levers do skim about a hundred grams off the weight of the mechanical versions.

The Shimano Ultegra Di2 ST-6770 STI Shifters come as a matched pair. For the record, these levers are not backwards compatible with the Dura-Ace Di2 derailleurs or wire kits. The wire system has been simplified -- a good thing for aesthetic reasons -- and we're told that the next gen Dura-Ace will share this new configuration. The wire kits and other associated electronic pieces are sold separately.

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Best bang for DI2 buck

  • Familiarity:I've put it through the wringer

These are perfect so what if they're 8g heavier than the 6870 di2 shifters they are compatible with 10 speed front and rear DI2 or with 11 speed front and rear derailleurs.

Comes with shifters and brake cables. Electronic cables need to be purchased separately. If you're looking for a big $ saver getting into the DI2 game these shifters are the ticket.

smooth shifting/braking everytime

  • Familiarity:I've put it through the wringer

the Ultegra Di2 setup is a very nice upgrade overall. i am running ultegra di2 on Nago and Orbea, one with dura-ace drivetrain and the other with ultegra drivetrain (both run 53/39 rings). shifting is very smooth on both bikes, even when i change out the wheelsets which have different rear cogs (11-28 and 12-30). dramatic changes in cogs require minimal adjustments that are made easy with the electronic calibration capabilities (i also use a 11-25 cassette). overall, the shifters/levers here are consistent, reliable, and comfortable. i will never go back to mechanical again.


  • Familiarity:I've put it through the wringer

After running mechanical for a while i bought a tarmac with di2. The results....excellent. I love the smoothness, the precision, and the durability of these shifters along with the entire di2 setup. I don't think I would ever go back to mechanical except for training purposes. For racing, di2 is the way to go especially when you are exhausted near the end of a race and it gets tough to continually throw shift levers on the mechanical setup rather than pressing a button on the di2

Can these levers be used for mechanical setup. Or are they electronic only?

is this only for a 10 speed cassette or will this work with an 11 speed as well?

These shifters are for 10 speed out of the box. Update the firmware with SM-PCE1 and they work for 11 speed. Once the firmware is updated to 11 speed, you can still use them with 10spd derailleurs. These shifters at this price of $111 was a steal.

Unanswered Question

What is included with these shifters? Is...

What is included with these shifters? Is the battery included? Are the only other items that need to be purchased the front and rear derailleur?


can I use this shifters instead of the...

can I use this shifters instead of the Shimano Ultegra ST-6700 STI Shifters?

Are they compatible?