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  1. #1
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    Dura Ace Di2 hydraulic disc brake group sets?

    Are these available anywhere? I don't think there is a DA hydraulic lever yet, but a group set with whatever their best levers and callipers are.

  2. #2
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    At this point the Hydraulic levers and brakes are non grouped, neither Dura ace or Ultegra. The brakes are basically XT brakes with the newest version (RS785)having a better hose entry at the caliper for more heal clearance and it has a better bleed nipple in my opinion. The shifters work with either 10 or 11 speed. Also the shifters don't have extra e tube ports so if your want sprint or climbing shifters you will need a 5 port junction A box.

  3. #3
    Clipless in Coeur d'Alene twocicle's Avatar
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    I'm looking forward to the next version of these shift levers (assuming Shimano will tune these down) because they are huge, heavy and stick out roughly 1cm further from the handlebars.

    It was surprising to see these only have a single Di2 wire port (regular Di2 Ultegra 10spd had 2 ports, and the 11spd has 3), but not a problem since I already have a 5-port junction box to accept TT shifters. I was considering getting the XTR Di2 display which also acts as a 3-port junction box, but then would need to add a b-junction up front for the TT shifters - if/when those are attached.

    For now, the 785 model is functional and the only game in town for road Di2 + hydraulic brakes.
    Last edited by twocicle; 05-06-15 at 11:29 PM.

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    I am just building up a disc braked single bike. I might get a full group set, use the DA levers and get some mechanical disc calipers for now.

  5. #5
    Clipless in Coeur d'Alene twocicle's Avatar
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    Quote Originally Posted by Dean V View Post
    I am just building up a disc braked single bike. I might get a full group set, use the DA levers and get some mechanical disc calipers for now.
    Frankly, I don't see the need for DA Di2 at all, especially given the large extra expense. The 6800 Ultegra series is extremely nice. Also note the Ultegra 6870 "mid-cage" RD has a 32t cog max, whereas the DA is only sort-cage and spec'd for a 28t max unless you intend to add the super long K-Edge cage too.

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    I won't need any more than a 28t on the rear. The DA is a bit lighter and it is already bad enough putting Shimano on a Colnago, let alone Ultegra.

  7. #7
    Clipless in Coeur d'Alene twocicle's Avatar
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    Since we are posting within the Tandem Cycling space, I just want to add a couple things to note for other readers here:

    1. Shimano specifically states in the Dealers Manual that these brakes are not for tandem bikes due to higher speeds and heavier loads.
    2. The Hydraulic Caliper guide included with the rs-785 set also states neither 180 or 203mm rotors should be used due to very high forces generated, but should only 160 or 140mm rotors.

    FWIW, etc, etc.

    ---

    Regarding the Colonago... yes, it should have nothing but Campy

  8. #8
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    [QUOTE=twocicle;17785445]Since we are posting within the Tandem Cycling space, I just want to add a couple things to note for other readers here:

    1. Shimano specifically states in the Dealers Manual that these brakes are not for tandem bikes due to higher speeds and heavier loads.
    2. The Hydraulic Caliper guide included with the rs-785 set also states neither 180 or 203mm rotors should be used due to very high forces generated, but should only 160 or 140mm rotors.

    FWIW, etc, etc.

    ---

    oops better take it off now that we have it and like it. Of course that goes for the fork, wheels, fixed stoker stem ,rotors, chain and probably a number of other components that are not "tandem rated"

    The brakes are powerful enough that Calfee reinforced their frames for this very reason.

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    The limited rotor sizes would be to get the correct lever feel/modulation for a single bike. So for a tandem the extra rotor size would be a good thing to help compensate for the extra mass that has to be stopped.

  10. #10
    Clipless in Coeur d'Alene twocicle's Avatar
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    guys, I get it. adapt with caution was the word.


    FYI: reposting this good Di2 info source... http://carltonbale.com/shimano-di2-e...-need-to-know/
    Last edited by twocicle; 05-08-15 at 11:44 AM.

  11. #11
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    Quote Originally Posted by twocicle View Post
    Frankly, I don't see the need for DA Di2 at all, especially given the large extra expense. The 6800 Ultegra series is extremely nice. Also note the Ultegra 6870 "mid-cage" RD has a 32t cog max, whereas the DA is only sort-cage and spec'd for a 28t max unless you intend to add the super long K-Edge cage too.
    Having a full built Dura Ace Di2 tandem I can tell you from first hand experience, you are absolutely wrong on the D.A. rear derailleur capabilities, I run a 11-32, 11 speed cassette with no problem. Also using a compact 50/34 or a mid-compact 52/36 I can run thru every combination with no problems, with the 52-32 crossed chained combination , the lower cage is not totally stretched out were there is enough space to shift back down with no problems & no funky upside down B screw!

  12. #12
    Clipless in Coeur d'Alene twocicle's Avatar
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    Quote Originally Posted by Bad1 View Post
    Having a full built Dura Ace Di2 tandem I can tell you from first hand experience, you are absolutely wrong on the D.A. rear derailleur capabilities, I run a 11-32, 11 speed cassette with no problem. Also using a compact 50/34 or a mid-compact 52/36 I can run thru every combination with no problems, with the 52-32 crossed chained combination , the lower cage is not totally stretched out were there is enough space to shift back down with no problems & no funky upside down B screw!
    Bad1,

    While you may be able to run greater than the 28t spec on your tandem, the spec is still 28t for the DA RD. Was I wrong? I don't think so.

    Success for reaching bigger cogs depends a lot on the RD hanger length which can vary, because a longer hanger will provide more room for the top jockey wheel to clear bigger cogs. Longer cage length is not needed for standard 16 tooth gaps between chainrings as is typical on double ring setups, so yes, the DA short-cage can handle the chain slack from a standard double ring setup which includes both of the compact sizes you mentioned.
    Last edited by twocicle; 05-09-15 at 02:39 PM.

  13. #13
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    We ended up going Dura Ace Di2 with the k edge long cage.

    I think compared with Ultegra it is an extravagance that by most measures isn't worth it.

    I figured in the context of the total cost, it was a relatively small difference, and I'm vain enough that I wanted the most visible part of the group to say Dura Ace.
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

  14. #14
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    + One

  15. #15
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    Bad1: What compact crankset are you using? Thank you.

  16. #16
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    Lightning Dynamics

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