Disc Brake Question
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  1. #1
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    Disc Brake Question

    I have some Shimano R785 shifters. They came with post mount brakes but now am wanting to put it on a bike that had flat mount brakes.

    Can I use R785 shifters with flat mount brake calipers (Think Ultegra)?

    Thanks!

  2. #2
    'brifter' is f'ing stupid
    Reputation: cxwrench's Avatar
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    Yep.
    #promechaniclife

  3. #3
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    Quote Originally Posted by cxwrench View Post
    Yep.
    Thanks! Just wanted to make sure the pressure in the larger cylinder isn't too much for the flat mounts. Thanks!

  4. #4
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    I知 going to go on record predicting that this will be the shortest thread EVER about disk breaks on the Interwebz. When I saw the thread title I ran to make popcorn. I thought the follow-up sentence/question would be (a) will I notice a difference between rims and disks (b) do I really need hydraulic vs cable actuated (c) I知 thinking about upgrading my bike to disk.... but cx gave a definitive answer on the first replay with a thumbs up. End of thread.

  5. #5
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    Quote Originally Posted by ogre View Post
    I知 going to go on record predicting that this will be the shortest thread EVER about disk breaks on the Interwebz. When I saw the thread title I ran to make popcorn. I thought the follow-up sentence/question would be (a) will I notice a difference between rims and disks (b) do I really need hydraulic vs cable actuated (c) I知 thinking about upgrading my bike to disk.... but cx gave a definitive answer on the first replay with a thumbs up. End of thread.
    Are you starting trouble here?
    "If someone needs 200 rolls of toilet paper for a 14-day quarantine, they probably should have made a doctor's appointment way before the COVID-19 outbreak." -- Unknown

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    bicycles in particular, you need to separate between what's merely true and what's important."
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  6. #6
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    Quote Originally Posted by ogre View Post
    I知 going to go on record predicting that this will be the shortest thread EVER about disk breaks on the Interwebz. When I saw the thread title I ran to make popcorn. I thought the follow-up sentence/question would be (a) will I notice a difference between rims and disks (b) do I really need hydraulic vs cable actuated (c) I知 thinking about upgrading my bike to disk.... but cx gave a definitive answer on the first replay with a thumbs up. End of thread.
    don't be so quick to assume it's over for this one - This forum is very capable of turning something simple into a run on stream of points and counter points that drift from technical minutia to grammar and punctuation.....I predict this horse aint dead yet.
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  7. #7
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    Quote Originally Posted by Srode View Post
    don't be so quick to assume it's over for this one - This forum is very capable of turning something simple into a run on stream of points and counter points that drift from technical minutia to grammar and punctuation.....I predict this horse aint dead yet.
    Shouldn't you be starting a sentence with a capital letter?
    "If someone needs 200 rolls of toilet paper for a 14-day quarantine, they probably should have made a doctor's appointment way before the COVID-19 outbreak." -- Unknown

    "With
    bicycles in particular, you need to separate between what's merely true and what's important."
    -- DCGriz, RBR.




  8. #8
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    Quote Originally Posted by Lombard View Post
    Are you starting trouble here?
    Quote Originally Posted by Lombard View Post
    Shouldn't you be starting a sentence with a capital letter?
    LMAO. Things start slowing down this time of year in the northern hemisphere so we gotta keep the traffic active. I was glad to see that Srode used the proper plural form of minutia instead of the singular noun minutiae. I would've been all over him for that.

  9. #9
    Cleavage Of The Tetons
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    Quote Originally Posted by ogre View Post
    I知 going to go on record predicting that this will be the shortest thread EVER about disk breaks on the Interwebz. When I saw the thread title I ran to make popcorn. I thought the follow-up sentence/question would be (a) will I notice a difference between rims and disks (b) do I really need hydraulic vs cable actuated (c) I知 thinking about upgrading my bike to disk.... but cx gave a definitive answer on the first replay with a thumbs up. End of thread.
    Breaks? BREAKS?
    Really?

  10. #10
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    Quote Originally Posted by rideit View Post
    Breaks? BREAKS?
    Really?
    Give me a brake!
    "If someone needs 200 rolls of toilet paper for a 14-day quarantine, they probably should have made a doctor's appointment way before the COVID-19 outbreak." -- Unknown

    "With
    bicycles in particular, you need to separate between what's merely true and what's important."
    -- DCGriz, RBR.




  11. #11
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    Quote Originally Posted by Lombard View Post
    Give me a brake!
    Sounds like it's time to take a break, or maybe to put a brake on this thread?

  12. #12
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    Back on topic briefly before further derailleurment - their are adapaters from Shimano that will aloud you to put the posed mount calibers on a flat mount fraim. (this auto fool some dicusion)
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    "The Spirit of the Party "serves always to distract the public councils and enfeeble the public administration. It agitates the community with ill-founded jealousies and false alarms, kindles the animosity of one part against another, foments occasionally riot and insurrection

  13. #13
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    Quote Originally Posted by ogre View Post
    I知 going to go on record predicting that this will be the shortest thread EVER about disk breaks on the Interwebz. .......
    Well, you were wrong!
    "L'enfer, c'est les autres"

  14. #14
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    New question. What hose do I need? I am looking at the BH-90 vs. BH-59 after reading some other threads and forums. You match the calipers and hoses and just connect it to the shifter via whatever connector needed.

    Looking to do this:
    BR-R8070 --> BH90-JK-SS --> R785 shifters

    Correct hose?
    Last edited by SRock24; 12-20-2019 at 08:21 AM.

  15. #15
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    Quote Originally Posted by SRock24 View Post
    New question. What hose do I need? I am looking at the BH-90 vs. BH-59 after reading some other threads and forums. You match the calipers and hoses and just connect it to the shifter via whatever connector needed.

    Looking to do this:
    BR-R8070 --> BH90-JK-SS --> R785 shifters

    Correct hose?
    I'm doing the same thing and planning on using BH90 hose - the only difference between the hoses is the inside diameter which is a bit smaller on the BH90 but gives a firmer feel from what I have read. The insert you use at the end should be the one that matches the hose.
    Gravel Rocks

    Trek Domane
    Niner RLT9 (Gravel Bike)
    Niner RLT9 RDO
    BH G7 Disc
    Trek Crockett

    "The Spirit of the Party "serves always to distract the public councils and enfeeble the public administration. It agitates the community with ill-founded jealousies and false alarms, kindles the animosity of one part against another, foments occasionally riot and insurrection

  16. #16
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    Quote Originally Posted by Srode View Post
    I'm doing the same thing and planning on using BH90 hose - the only difference between the hoses is the inside diameter which is a bit smaller on the BH90 but gives a firmer feel from what I have read. The insert you use at the end should be the one that matches the hose.
    Right on. Any chance you know if it will be the SS or SSR hose? I'm seeing the two and it looks like there is a bolt on the SSR but not sure if I would need that. SS hose is about half the cost of the SSR hose.

  17. #17
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    the 8070 calipers don't use banjo bolts, that's an old version of road calipers. They were changed because they often got in the way of cyclists heals.
    Gravel Rocks

    Trek Domane
    Niner RLT9 (Gravel Bike)
    Niner RLT9 RDO
    BH G7 Disc
    Trek Crockett

    "The Spirit of the Party "serves always to distract the public councils and enfeeble the public administration. It agitates the community with ill-founded jealousies and false alarms, kindles the animosity of one part against another, foments occasionally riot and insurrection

  18. #18
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    Quote Originally Posted by Srode View Post
    the 8070 calipers don't use banjo bolts, that's an old version of road calipers. They were changed because they often got in the way of cyclists heals.
    So that's a go with the SS hose. Got it. Thanks!

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