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Shimano ST-R785 Di2 Hydraulic STI Lever & Disc Brake Caliper Set

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    • One Color, Easy Hose Joint System
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    6 Reviews


    ST-R785 Di2 Hydraulic STI Lever & Disc Brake Caliper Set

    The R785 Di2 Hydraulic STI Lever and Disc Brake Caliper Set marks Shimano’s hydraulic disc brake debut, and because the UCI has not yet approved disc brakes at the pro-level (for which its flagship Dura-Ace groupset is intended), the R785 is atop the pack.

    The R785s feature Shimano’s IceTech technology, which results in braking power that is consistent no matter what the conditions. By placing cooling fins in the braking pads, Shimano has found a way to dissipate heat more effectively, allowing the brakes to grab faster and the pads to last longer. In addition, Shimano’s disc break system was designed to work with Di2 electronic shifting. In order to hold the fluid reservoir for mineral oil, the front profile of the R785s is higher than previous Ultegra profiles. The R785s also feature reach and stroke adjustments to ensure that your hand position is ideal. Lastly, keep in mind that Shimano’s ST-R785 Di2 Hydraulic STI Lever and Disc Brake Caliper Set does not include the rotors.

    • Ultegra-level hydraulic disc brake and Di2 shift levers
    • Japanese precision updates hydraulic braking
    • Race-worthy shift action from the most popular group we sell
    • Levers provide reach and stroke adjustment to dial feel
    • Heat-dissipating features keep the braking responsive
    • Item #SHI001Z

    Tech Specs

    ST-R785 Di2 hydraulic STI
    BR-R785 hydraulic disc brake
    Mount Type
    mineral oil
    Claimed Weight
    [levers] 498g, [caliper] 262g
    Recommended Use
    cyclocross, gravel, road cycling
    Manufacturer Warranty
    2 years

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    One major caveat

    • Familiarity: I've put it through the wringer

    These brakes work. The major downer is the excessive free throw. The tip of the lever travels 3.5 cm. Compare to 18mm from SRAM levers. What this means is that braking 1-finger from the hoods is very difficult. This is a widely reported problem.
    The newer Shimano brakes are much better.

    Very comfortable for XL sized hands

    • Familiarity: I've put it through the wringer

    Dura Ace level quality and function. I saw so many people comment on how they hate the size and yet I'm blown away at how comfortable they are. I normally wear an XL sized glove and these things fit my hands perfectly. I get so uncomfortable on my mechanical Ultegra levered bike now that I know how much I prefer the hydro specific levers. The first levers I have been able to ride without gloves all day.

    They did 'feel' like they added about another cm of reach compared to the non-hydro levers I had on the same handlebars on another bike.

    Easy setup just need a better hood

    • Familiarity: I've used it several times

    These shifters are rad and compatible with the newer 8070 and 9170. Great choice if you still have a post mount frame like me. They set up relatively easy and work well.

    The only complaint is the hoods are big. The newer hydro di2 shifters are better and you can always upgrade later. Please let me know if you have any compatibility questions.

    I concur that overall these shifters are great. One issue I think I have is that I want to add the remote climbing shifter (the R600) and just learned that these have only a false extra port so I have no where to plug the R600 in. Forums note that I need to now get a 5 port EW-90B. Somewhat of a bambleboozlement by Shimano if you ask me.

    Great shifters and hydro brakes :-)

    • Familiarity: I've put it through the wringer

    I have a background in MTB'ing so the lack of hydraulic disc brakes was an adjustment when I first started riding road. Now, years later, I have 2 bikes with these shifters and they work great. I may upgrade to the new dura shifters when they come out so I can have the button and the better button action. A couple small "nagging" issues with the r785's is that they rattle if your hand isn't on them and that they feel a little "fat" on the hoods.

    Once you go hydraulic and electronic...

    • Familiarity: I've used it several times

    Di2 ain't nothing new - it works perfect every time, all of the time. That's old news. These brakes...holy moly. Take your sweetest mountain bike brakes and stick them inside a Di2 lever. Not grabby, not too strong, and as easy to modulate as a soft bristled tooth brush on a sunny Friday morning.

    You can go faster when you have more control - and these are the ticket. I'm a nerd for having the brakes engage where I want them to within the lever stroke, and you can dial this in with the reach adjustment, which really was the icing on the cable-less cake. I was inclined at first to go 1x with the SRAM setup, but the lever feel of these brakes is amazing, and I like the hood shape better.

    I totally agree. Have this system on my new Roubaix. Took that bike on the Unknown Coast ride last fall for the first ride, with wicked steep descents. I love these brakes and Di2 ! I can stop a lot faster, surer, which means I can go faster, until the last minute ! Perfect for Northern California mountain riding !

    Add me to the list of impressed; the Shimano DI2 hydraulic set is just solid. I have owned it for about 6 months and it is such a game changer after many years of road caliper brakes. Its to much fun and adds a new, unique element to road riding.

    Is this set compatible with the 6870 derailleurs? What all would be required to upgrade to Di2?

    Are the levers compatible with the rest of the Ultegra 11 speed 6800/6870 groupset?

    Do you need adjusters on the frame to accomodate the brake calipers? In particular for fitting them on a NINER BSB 9 RDO 2016 frame and running 160 mm rotors (F and B)?

    The 20i6 BSB is available with these installed, so they will definitely fit your frame. I have a 2015 with them and the brakes do require spacers for 160mm rotors. You don't need them for 140s.

    A complete set (2 levers & calipers) really weighs 1724gm? Ouch, that is 3.8lbs not including hoses, fluid and rotors!

    Bryan, You're looking at 1000g for standard Di2 levers and rim calipers without cable or housing. These brakes do include the hosing and oil- no rotors. Sure, Its a bit more weight, but most bikes are well below the UCI weight limit and stopping later makes you go faster every time.


    Not to nit pick, but from your own data:

    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 (Actual Weight:Gray, 6870: 323g)

    The Shimano Ultegra 6800 Brake Calipers are available in one size and one color (Actual Weight: Gray, One Size: 335g).

    That makes for only 658gm for Ultegra Di2 shifters & rim calipers (add cables), but still near 1kg lighter than the hydraulics.

    From what I'm reading about the hydrualic stuff elsewhere, the shifters Actual weight: 508 grams (lever pair only)) + the calipers, etc... I think you have doubled the pair weight to arrive at 1724gm which seems excessive.

    Best Answer

    Hint, you need to correct your product info which is stating this set is some 900gm more than actual.

    Bikerumor has a posting with photos of actual weights: shifters: 255, calipers: 98, pads: 20. Double that up for a pair comes to 746gm total, plus hoses and fluid.

    A couple competitor websites also have data in this same ballpark, ie:

    1- Claimed weights: Shifter - 515g, Caliper - 263g, Hose - 61.5 g

    2- Actual weight: 739 grams (Levers and calipers)

    Strange nobody here thought that maybe 1724gm (3.8lbs) was just a tad heavy for a set of shifters & calipers (w/pads) and hoses.

    Are these levers compatible with hydraulic rim brakes, such as those made by Magura or SRAM?