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  1. #1
    Kid A TurbineBlade's Avatar
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    Moving spacers on brake pads...

    Does moving spacers on the pads to push the actual pad closer to the rim at rest increase power?

    I am referring to tektro oryx cantilevers with v-brake pads.
    Cyclist, angler and aquarist

  2. #2
    Giant Puzzle jco1385's Avatar
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    i dont see how this is any different than just running the cable a little tighter.

  3. #3
    Great State of Varmint Panthers007's Avatar
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    Correct. The spacers really only position the pads closer to the rim*. Though some will argue that the angle is most important. I suggest you position the pads so they are going to strike the rim, when you apply the brakes, as square-on as possible so the largest area of the pad contacts the rim as possible. Remember to toe-in the pads with the spacers - and test ride to make sure the brakes stop you as effectively as possible.


    * and angle the pads with a gentle toe-in position.
    How do you keep an idiot in suspense?

  4. #4
    Kid A TurbineBlade's Avatar
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    i dont see how this is any different than just running the cable a little tighter.
    My first thought as well as I was pushing this around in my head, but I don't think it is true. I think spacing the pads inward toward the rim further changes the geometry of the pads with respect to the brake arms. I just didn't know if it makes a difference or not.

    The instructions for tektro oryx brakes says that you can move a spacer around if you want, but it might just be for proper angle based upon your rim width and bike fork.

    Maybe not.
    Cyclist, angler and aquarist

  5. #5
    velo-orange
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    Circle A cycles just addressed this sort of thing:

    http://www.circleacycles.com/cantilevers/

  6. #6
    nice idea, poor execution
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    Quote Originally Posted by Gene2308 View Post
    I think spacing the pads inward toward the rim further changes the geometry of the pads with respect to the brake arms. I just didn't know if it makes a difference or not.
    It does make a difference, and can be used to correct for narrow rims on a bike with widely spaced cantilever posts, and vice-versa. Play around a bit in MAITOY by bbelhumeur ( http://www.circleacycles.com/cantilevers/ ) and you'll see what I mean.

    It's different from running the cable a little tighter.
    Kevin Duffy, Harris Cyclery, West Newton, MA.
    blog.harriscyclery.com

  7. #7
    Great State of Varmint Panthers007's Avatar
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    If it's hitting the rim square-on, I don't see why placement of the spacer(s) make a difference. My v-brake pads are aesthetically incorrect for the placement of the spacers - but the contact the rim better than if they look pretty and clean.
    How do you keep an idiot in suspense?

  8. #8
    Senior Member
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    spacers are for adjusting the arm position during pad contact. for v brakes the arms should be vertical when the pads contact the rim.

  9. #9
    Kid A TurbineBlade's Avatar
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    spacers are for adjusting the arm position during pad contact
    I think the conical washers are for aligning the pads, the spacers are for keeping the pads fixed at a certain distance from the brake arms because they are threaded instead of the old style.

    Not to be argumentative - I just don't think that is correct either.
    Cyclist, angler and aquarist

  10. #10
    In beaurocratic limbo urbanknight's Avatar
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    The instructions for the Shimano V-brakes say you should use whichever spacer setup that allows at least 39mm of cable between the noodle and the allen bolt. I don't know how that correlates to braking power, but it does affect the position of the brake arms, which may affect leverage.
    "Well, I guess you can cut the arts as much as you want... Sooner or later, these kids aren't going to have anything to read or write about." (Richard Dreyfus as Glenn Holland)

  11. #11
    In beaurocratic limbo urbanknight's Avatar
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    Quote Originally Posted by Gene2308 View Post
    I think the conical washers are for aligning the pads, the spacers are for keeping the pads fixed at a certain distance from the brake arms because they are threaded instead of the old style.

    Not to be argumentative - I just don't think that is correct either.
    Yeah, I've never had a problem getting the pad to hit the rim square and properly on either setting. I just noticed that it changes where the arms are, and it seems (this is just perception) that I get mushy braking if the arms are too close to each other.
    "Well, I guess you can cut the arts as much as you want... Sooner or later, these kids aren't going to have anything to read or write about." (Richard Dreyfus as Glenn Holland)

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