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D-brake reinforcement support

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  • #16
    Originally posted by MuniAddict View Post
    yeah, unfortunately they don't make any frame larger then 29er.
    Actually, their L size can accommodate up to 32"!

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    • #17
      Originally posted by SanJoseUnicyclist View Post
      It makes me think that there is room for KH or UDC to develop a better out-of-the-box production solution.
      It does exist, it's called buying a frame with welded on disk tabs.

      A D-Brake adapter is really always going to be flawed, since there are only two bolts available on all frames, the bearing bolts (they happen to be in an unfortunate position for brake mounting). Any clamping solution would have to be pretty specific for each tube profile, since the forces can be pretty high, so you need rather a lot of surface area.

      Side question: Does anyone know why we aren't using post mounts? IS2000 seems like the worse standard when it comes to handling the forces to me. Pretty much all failures on Muni frames I've seen are close to the brake mounts.
      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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      • #18
        Originally posted by SanJoseUnicyclist View Post
        Terry, do you have problems with disk brake chatter on steep downhills? I do, and had to add a bracket to support the D-brake adapter.

        I'm just curious about when other people have issues with chatter. For me, I'm riding a KH 29" with a 203-mm disk and TRP 4-piston calipers with steel pads. If I'm on a hill that is >22 degree grade, this setup chatters really bad. So far, my little bracket has fixed the problem. But, what a hassle.
        I have my second D'Brake on my 26 Downhill Muni and one on my 36" XC.
        I broke the original on my 26" about 3 years ago and now use a custom build "Hugo strut" that works well. I think I have the newer reinforced version of the D'Brake on both, but not sure. Unfortunately I have to have an almost 90 degree bend on mine to bolt to the D'Brake and at this point I have now broken 2 struts (I think just from excessive bending when changing tires/brake pads etc,).

        Otherwise I have never had chatter. Even when my D'Break fractured and broke I didn't have any noise or problems. I think about 3 minutes before it broke the pads started rubbing and then it failed totally.
        36" Nimbus Oracle, VCX 100/125/150, 200mm disc
        29+ KH, Maxxis DHR II 29x3, 127/150 Spirits
        Schlumpf (KH29) Duro Crux 29x3.25 137/117 Spirits
        26" Nimbus, Maxxis DHR IIx2.8, 117/137 Sprt
        19" Trials Impact Athmos
        20" Qu-Ax Profi Freestyle, 89mm VCX

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        • #19
          Originally posted by MuniAddict View Post
          And here is a more direct method for reinforcing the D brake, with no attachment to the frame required.


          [ATTACH]73130[/ATTACH]
          Looks clean, although the disadvantage is that the D'Brake has to sometime handle forces in both directions, foward from braking force and backward when hopping with the brake engaged. I'm not sure how great those forces are but it's possible that the bending back and forth in oppostie directions also contributes to the fatigue... My strut gives a pretty solid support and should limit bending in either direction, which gives me some piece of mind after cracking my old one.
          36" Nimbus Oracle, VCX 100/125/150, 200mm disc
          29+ KH, Maxxis DHR II 29x3, 127/150 Spirits
          Schlumpf (KH29) Duro Crux 29x3.25 137/117 Spirits
          26" Nimbus, Maxxis DHR IIx2.8, 117/137 Sprt
          19" Trials Impact Athmos
          20" Qu-Ax Profi Freestyle, 89mm VCX

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          • #20
            Originally posted by MUCFreerider View Post
            I have my second D'Brake on my 26 Downhill Muni and one on my 36" XC.
            I broke the original on my 26" about 3 years ago and now use a custom build "Hugo strut" that works well. I think I have the newer reinforced version of the D'Brake on both, but not sure. Unfortunately I have to have an almost 90 degree bend on mine to bolt to the D'Brake and at this point I have now broken 2 struts (I think just from excessive bending when changing tires/brake pads etc,).
            Sounds like you need to upgrade to the Ultimate Hugo Strut™
            Attached Files
            Unicycling is the fountain of youth.

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            • #21
              Hey Terry, here is a link to my solution:

              http://www.unicyclist.com/forums/sho...heating&page=3

              So far, this has been rock solid on +20 percent grades (several 1/4 to 1/2 mile downhills about 3 times a week). But, it's a little impractical considering it was custom CNC milled...

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              • #22
                Originally posted by finnspin View Post
                Side question: Does anyone know why we aren't using post mounts? IS2000 seems like the worse standard when it comes to handling the forces to me. Pretty much all failures on Muni frames I've seen are close to the brake mounts.
                Qu-Ax does!
                Einradfahren in Sachsen:
                einradsachsen.com
                f/EinradSachsen
                02.06.2019: Europamarathon

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                • #23
                  the team Ursli solution:
                  Attached Files
                  If everything's under control, you're going too slow

                  I trust in those:

                  Triton

                  Mountainuni Brake System

                  Schlumpf

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