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Brake Question

Started by duckaxe · · Last activity · 11 posts · 349 views

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rec.sport.unicycling
Published
9 February 2008
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16 February 2008
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duckaxe
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  1. Hi Guys,

    This question may have been posed before, but if it has, I can't seem
    to find it.

    I have a Nimbus II 26" MUni with a double-wide rim and 3" tire. I want
    to put a brake on it, but I have no idea what hardware I need. I've
    done tons of searches, looked at bunches of pictures, looked at the
    hardware on unicycle.com and I just can't seem to figure it out.

    I would prefer not to have to braze on the posts, as I don't have
    access to welding equipment.

    Also, is it possible to use a bicycle v-brake/cantilever-brake with a
    double-wide rim?

    If someone could tell me what the most inexpensive and/or easiest way
    to do this would be, I sure would appreciate it.

    Thanks a lot in advance.

    Wes

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  2. if you don't want to weld then you'll need a new frame, very few
    manafactureres do 26" anymore, i think KOXX (and possibly Qu-Ax) are
    your only options.

    yes you can use V-brakes, althought there are issues with clearing the
    cross cable on very large tyres, need to get a set-up with long arms.
    Cantilevers are just [censored], never seen them used on a uni.

    --
    kington99

    Dave

    - what a thoroughly post-modern subversion of the cycling genre -
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  3. What you would want is something like 'this'
    (http://www.unicycle.com/shopping/shopexd.asp?id=566) but I am not sure
    if you can fit a 3" tire in there or if the break itself would be able
    to clear the top of the tire.

    --
    saskatchewanian

    phlegm said:

    The best way to overcome a mental block is to do a mental rolling hop
    over it. :p


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  4. I'd say try to find someone who welds. Ask around, maybe a friend of a
    friend.

    I asked my LBS about the V-brakes and they didn't think it would clear
    a 3" tire, and refused to speculate at what the widest tire would be.
    They basically said I'd have to get the parts and try it at my expense.

    I put a 2.4" tire on my MTB and although it was close to the cables, I
    think I probably could have fit a 2.5". Keep in mind the Nimbus' wider
    rim would make the tire effectively not as tall as on most MTB rims,
    and I'm pretty sure there are longer V-brake levers than what were on
    my Specialized.

    --
    skilewis74

    Ride everywhere and never just ride anywhere. If you can ride where you
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    time do it along the way.
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    'Trials Building'
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  5. After a bit more thought I now really don't think that you can use
    regular V-breaks with a 3" tire. The tire almost rubs the crossover
    cable on my bike with a 2.6 on the back. If you could find a set of
    breaks with a really long arm and a long pull lever you could pull it
    off but with the expense it would probably make more sense to just go
    with a Magura setup.

    I think there are long arm V breaks on the Xtracycle website but they
    were really expensive if I remember right.

    --
    saskatchewanian

    phlegm said:

    The best way to overcome a mental block is to do a mental rolling hop
    over it. :p


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  6. Thanks a lot for the input, guys. It looks like I'll probably have to
    go with trying to find someone to braze the mounts on and attach a
    Magura brake set. I really love my 26", so swapping the frame isn't an
    option.

    Thanks again.

    --
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    Free mounting made easy:


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  7. Anybody know what is the widest tire for V-brakes, and what lever arm
    length would I need?

    (I think I've maxed out my options for welding w/o spending $70 +
    hardware)

    --
    skilewis74

    Ride everywhere and never just ride anywhere. If you can ride where you
    are going within a hour, do it, and if you can do a trick 50-75% of the
    time do it along the way.
    Bob Burnquist on how to improve significantly.
    'Trials Building'
    (http://www.unicyclist.com/forums/showthread.php?t=64235)
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  8. duckaxe said:

    Thanks a lot for the input, guys. It looks like I'll probably have to
    go with trying to find someone to braze the mounts on and attach a
    Magura brake set. I really love my 26", so swapping the frame isn't an
    option.

    Thanks again.

    You *can* put v-brakes on a 26x3, as long as the mounts are set quite
    high up. However, it still requires brazing, and v-brakes don't cost
    much different to maguras. For an out and out muni maguras probably
    make sense, I like v-brakes for touring as spares are easy to get &
    light to carry, but munis it's less important, and maguras are nice and
    easy to set up.

    Setting up the magura braze on mounts for welding is easy. First you
    work out where they will go, and file off the chrome under where the
    tabs will go. Then you need to clamp them on using hose clamps (I used
    hose clamps with blocks of wood on the outside on the frame), make sure
    they're in the right place (there are specifications for where to put
    them on the magura website). Make really really sure they're in the
    right place and the hose clamps are tight enough so the mounts can't
    move around. Also make sure the clamps are nowhere near the tabs on the
    magura mounts. Then take them to any place that can weld (any local
    metal shop / engineering company - we have four or five in our yellow
    pages in a small town, there probably is one near you), and ask them to
    weld them on. At mine, it cost me £4 to get it done. The welding on
    itself only takes about 5 minutes (plus 5 minutes to let it cool), the
    reason bike shops charge a fair amount is because the setup takes time,
    if you do the setup there's not much work left.

    Mine, I got it welded, just because the first person I went to did
    welding and not brazing, I don't think it makes masses of difference as
    long as the person welding has some skill, the only hassle is that if
    you get the setup wrong, welding is permanent and can't be undone,
    whereas I think brazing can be. But you're only risking a £20 nimbus II
    frame anyway.

    If you don't want any hassle and have lots of money, unicycle.com would
    almost certainly be able to get you a nimbus II frame with magura braze
    ons, I know the UK one has got a few done, I didn't do it that way
    because it was cheaper and quicker to do my existing frame.

    Joe

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  9. Thanks a bunch for the advice Joe.

    One of my teammates (I'm a downhill MTB racer) is a mountain bike
    manufacturer. He owns Aztech Bike Frames. He agreed to braze it on
    for me for some beer. And one of the guys I ride MTB with gave me an
    HS33 that he removed when he got his disc brakes. So it cost me the
    mount kit and some beer to acquire a brakeset and get it professionally
    welded... sweet. 😎

    I'll post it up in the "Post your uni's" section when he gets it done.

    Wes

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  10. skilewis74 said:

    Anybody know what is the widest tire for V-brakes, and what lever arm
    length would I need?

    (I think I've maxed out my options for welding w/o spending $70 +
    hardware)

    I don't know what kind of uni you have, but after seeing how well the
    Maguras grip and how they mount, I have to agree with the other guys on
    here about not mounting v-brakes to a MUni.

    Like I said in the above post, I'll take some detailed pics of the
    finished product and post 'em up.

    --
    duckaxe

    Free mounting made easy:


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  11. joemarshall said:

    welding is permanent and can't be undone

    I have a file, a grinder and a hacksaw that all disagree with you :p

    --
    maestro8

    Those are my principles. If you don't like those, I have others. --
    Groucho Marx

    The only way to comprehend what mathematicians mean by Infinity is to
    contemplate the extent of human stupidity. -- François-Marie Arouet de
    Voltaire
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