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new Ultegra compatibility question

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  • August 23, 2017 at 12:40 pm #27544
    SteeveB

    Anyone know if i can replace a BR-RS805 rear disc brake calliper with the new BR-R8070 one?  Seems to be hard to find the RS805 ones anywhere online now. 

    SAB

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  • August 25, 2017 at 8:04 am #900681
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    SteeveB

    john latimer wrote:

    john latimer wrote:
    It will work I replaced mine with dura ace just case of bleeding up levers on other hand are different m7 thread as opposed to m6 on calipers and old levers

     

    john, to be clear, you fitted dura ace callipers to replace some RS805s? Did the hose fit the calliper? It seems to be a different diameter.

     

    SAB

    August 24, 2017 at 10:19 pm #900679
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    john latimer

    It will work I replaced mine
    It will work I replaced mine with dura ace just case of bleeding up levers on other hand are different m7 thread as opposed to m6 on calipers and old levers

    August 24, 2017 at 9:35 pm #900677
    0
    part_robot

    The hose answers are correct

    The hose answers are correct ^ (Have looked into this in depth with a Shimano expert and Dura Ace hydro which is basically the same situation). Using the wrong hoses may make your brakes either super rigid feeling or super spongy depending on which way you get it wrong.

    August 24, 2017 at 7:54 am #900675
    0
    SteeveB
    StraelGuy wrote:
    I went through this recently fitting 685/805 hydraulic brakes. Those two hoses are slightly different diameters. The BH59 is the older, slightly wider bore and  uses the olive and brass end fitting kit whereas the BH90 is the newer, narrower standard and uses the olive and silver end fitting kit.

     

    So, i would need to put in new brake hoses. That probably means the levers will need the BH90  hoses, so i would have to change them too.  So then the Ultegra disc brake callipers arent a replacement for the 805s. 

    I wonder if you can make the BH59 hose fit. More digging!

    August 24, 2017 at 7:18 am #900673
    0
    StraelGuy

    I went through this recently

    I went through this recently fitting 685/805 hydraulic brakes. Those two hoses are slightly different diameters. The BH59 is the older, slightly wider bore and  uses the olive and brass end fitting kit whereas the BH90 is the newer, narrower standard and uses the olive and silver end fitting kit.

    August 23, 2017 at 10:16 pm #900671
    0
    SteeveB
    VeloUSA wrote:
    According to this Shimano compatibility chart it appears you can. Click on caliper model to compare specs.  http://productinfo.shimano.com/#/com/2.7?cid=C-460&acid=C-461

     

    Hmm, when i look at the chart everything seems to be the same except for the hose. My RS805 uses an SM-BH59 hose, but the new ultegra R8070 uses SM-BH90. Not sure what the difference is. Need to do more digging.

    August 23, 2017 at 10:05 pm #900669
    0
    SteeveB
    VeloUSA wrote:
    According to this Shimano compatibility chart it appears you can. Click on caliper model to compare specs.  http://productinfo.shimano.com/#/com/2.7?cid=C-460&acid=C-461

     

    that is a good chart. There is lots of info in there. Good find!

    August 23, 2017 at 3:37 pm #900667
    0
    VeloUSA

    According to this Shimano

    According to this Shimano compatibility chart it appears you can. Click on caliper model to compare specs.  http://productinfo.shimano.com/#/com/2.7?cid=C-460&acid=C-461

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