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Nimbus D-brake -vs- Mountain Uni UCM brake mounts

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  • #16
    Before I got the D'brake I used the UCM without a spacer, it was like that for at least half a year and I had no issues. These adaptors really should have a firm surface to push on though.


    EDIT: I just clicked on your links, nice job. I especially liked the adaptor, did you make it yourself?



    It looks much more elegant than just a flat chunk of steel with a hole in it (what I would have done)
    Last edited by saskatchewanian; 2014-01-28, 07:52 AM.
    My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton

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    • #17
      Originally posted by saskatchewanian View Post
      ... I especially liked the adaptor, did you make it yourself?
      Yes, I designed it myself after measuring the bearing housing and the d'Brake and hat it produced by a friend. The major purpose was to guide the sheetmetal bearing housing of the frame to prevent it from bending when tightening the screw. It fits the sheetmetal bearing housing of the QU-AX, if other unis have the same, then it fits them too. I can provide CAD data or manufacturing drawing if needed.
      Einradfahren in Sachsen:
      einradsachsen.com
      f/EinradSachsen
      07.06.2020: Europamarathon

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      • #18
        I have a 24" Impact frame with a 24" KH wheel set. Have yet to put anything together. Desire to have internal disc brake. Any idea's if d-brake will work? I know the KH disc brakes are mounted externally, why? If d-brake would work, what would be best brake?

        Thanx

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        • #19
          If you want a internal disk you would need to get a new hub and completely rebuild your wheel, as well as a disk break adaptor and break. If you decide to go external you just need some new cranks with the brake and adaptor, and as a bonus you get strong light dual hole cranks.
          My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we’ll change the world. - Jack Layton

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          • #20
            Originally posted by Eric aus Chemnitz View Post
            Yes, I designed it myself after measuring the bearing housing and the d'Brake and hat it produced by a friend. ... I can provide CAD data or manufacturing drawing if needed.
            Very nice. What type of shop could produce it? What type of material would be suitable? I would like to have the information to have one made. Could you pm the info?

            Thanks!

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            • #21
              Originally posted by Rod View Post
              Very nice. What type of shop could produce it? What type of material would be suitable? I would like to have the information to have one made. Could you pm the info?

              Thanks!
              I had it produced via SLM (Selective Laser Melting ... 3D printing with metal) out of steel (don't know which alloy). I think any sort of normal steel would just be fine (e.g. S235JR) or even aluminium. I must only take compressive forces, not more. It can be produced by any manufacturer that has a small cnc milling machine out of 6mm flat steel.

              I PM you the CAD data and drawing. I did this construction for a Qu-Ax steel frame. I'm not 100% sure if it fits any other steel frame. Just plot the drawing 1:1 on paper and check if the groove will fit your frame.
              Einradfahren in Sachsen:
              einradsachsen.com
              f/EinradSachsen
              07.06.2020: Europamarathon

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              • #22
                Please post a photo when you have it produced.
                Einradfahren in Sachsen:
                einradsachsen.com
                f/EinradSachsen
                07.06.2020: Europamarathon

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                • #23
                  Originally posted by saskatchewanian View Post
                  Eric aus Chemnitz brings up a good point. The MU UCM has a flat top compared to the D'brake's staggered surfaces. Where the D'brake is tightened on the side with the arm first then snugged up on the other side the UCM would be installed like a normal bearing holder.
                  [...] I now use a washer under the arm side of the UCM to transfer the force to the frame like the D'brake does and both need to be shimmed out to work with the KH cranks as the Spirit cranks place the disk a bit further from the frame than bike cranks with a MU disk would.
                  ...
                  Originally posted by Eric aus Chemnitz View Post
                  I did not know, that the UCM does not provide this staggered shape. So thats plus for the d'Brake. It'll make no sense to tighten the bearing holder with a defined torque for not deforming and so damaging the bearing and on the other side let the whole brake force go radial right into the bearing just to deform it to egg shape.

                  I wonder if riders with the UCM therefore do have damaged bearings a bit more often. Did anyone have issues with that?
                  So here it is: we now have the first broken frame caused by the UCM Caliper:
                  http://unicyclist.com/forums/showthr...19#post1662619
                  Einradfahren in Sachsen:
                  einradsachsen.com
                  f/EinradSachsen
                  07.06.2020: Europamarathon

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                  • #24
                    I think this belongs to this thread but was not mentioned here yet:
                    To avoid broken d'Brakes, Hugo from the german part of the forum designed a strut to support it. We call it "Hugo Strut". Many riders have installed one to their d'Brake yet. It also helps against vibration noise
                    This is how it looks like:

                    Einradfahren in Sachsen:
                    einradsachsen.com
                    f/EinradSachsen
                    07.06.2020: Europamarathon

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                    • #25
                      Originally posted by Eric aus Chemnitz View Post
                      I think this belongs to this thread but was not mentioned here yet:
                      To avoid broken d'Brakes, Hugo from the german part of the forum designed a strut to support it. We call it "Hugo Strut". Many riders have installed one to their d'Brake yet. It also helps against vibration noise
                      I'd like to figure out something like that for my Oracle frame, which doesn't have the magura mount to use as an attachment point for the strut. The stock brake worked fine, but I had to replace it after a crash, and I've had a terrible time trying to make the new brake stop shuddering.

                      I've tried things like cleaning, sanding, replacing pads, replacing rotor, no help. I finally stopped it by forcing a little bit of toe-in on the pads, but I don't like the solution, so I'd love to find something better. Has anybody tried something similar to this, but just clamping it to the frame leg somehow?

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                      • #26
                        Originally posted by MrImpossible View Post
                        Has anybody tried something similar to this, but just clamping it to the frame leg somehow?
                        Yes. A strip of flat steel, a m6 bolt and nut, and some aluminum tube (I believe I used 9mm diameter) will do the trick nicely.

                        Bend the steel around the frame leg, drill 2 holes through it. Hammer one side of the tube, drill a hole large enough for the bolt on the brake mount to pass through. Shorten to desired length drill another hole through the tube for the frame clamps screw to go through. I used a different pickup on the D brake than the one Eric posted (the one where the post mount adapter is bolted to the bearing holder) I can dig out pictures if you want.

                        It really helps a lot, much less vibration under braking now.
                        In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move. -Douglas Adams.

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                        • #27
                          Originally posted by MrImpossible View Post
                          Has anybody tried something similar to this, but just clamping it to the frame leg somehow?
                          Yes, Charly did:
                          http://www.unicyclist.com/forums/sho...0&postcount=57
                          Last edited by Eric aus Chemnitz; 2016-09-05, 06:09 AM.
                          Einradfahren in Sachsen:
                          einradsachsen.com
                          f/EinradSachsen
                          07.06.2020: Europamarathon

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                          • #28
                            Thanks for the replies - I'll give it a try.

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                            • #29
                              and this is, how the solution looks like on an Oregon:
                              http://unicyclist.com/forums/showpos...1&postcount=28
                              Einradfahren in Sachsen:
                              einradsachsen.com
                              f/EinradSachsen
                              07.06.2020: Europamarathon

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                              • #30
                                Here's my first pass at a fix, just using things I had lying around; I haven't had a chance to really try it out yet.
                                Attached Files

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