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  1. #1
    xtrajack xtrajack's Avatar
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    Disc tabs on vintage fork?

    Hello, all,
    I don't know if this is the right place to ask this, is it possible to have disc tabs added to a vintage fork?

    Backstory:
    I have a nice steel framed vintage bike, that I would like to be a donor for an Xtracycle build.
    The existing fork doesn't have disc tabs. I have become a real big disc brake fan. The existing fork is 1" threaded, so buying a replacement fork with disc tabs doesn't seem to be an option.

    Thank you for your response.
    2008 Kona Fire Mountain/Xtracycle
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    I void warranties.
    Cycling well IS Cycling Advocacy
    Originally Posted by Steely Dan: if you're riding a bike and not having fun, then you're doing it wrong.

  2. #2
    Senior Member bobbycorno's Avatar
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    I'm no expert, but from what I've heard the fork is probably not strong/rigid enough for the stresses of a disk brake. I'd ask a professional framebuilder.

    SP
    Bend, OR

  3. #3
    It's true, man.
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    Disk forks are built to withstand the different braking forces that disks provide.

    Welding disk tabs on a non-disk fork results in failure where the fork leg folds backward at the top of the disk tab. I experienced this recently.
    Last edited by truman; 07-06-10 at 03:23 PM.

  4. #4
    xtrajack xtrajack's Avatar
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    Quote Originally Posted by truman View Post
    Disk forks are built to withstand the different braking forces that disks provide.

    Welding disk tabs on a non-disk fork results in failure where the fork leg folds backward at the top of the disk tab. I experienced this recently.
    I was afraid that it would turn out to be something like that, but, Hope springs eternal.

    I guess that I would have to find a frame builder and see if I could have a custom made fork. Probably would be cost prohibitive.
    Last edited by xtrajack; 07-06-10 at 03:33 PM.
    2008 Kona Fire Mountain/Xtracycle
    [SIGPIC][/SIGPIC]
    I void warranties.
    Cycling well IS Cycling Advocacy
    Originally Posted by Steely Dan: if you're riding a bike and not having fun, then you're doing it wrong.

  5. #5
    Senior Member
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    Quote Originally Posted by xtrajack View Post
    I was afraid that it would turn out to be something like that, but, Hope springs eternal.

    I guess that I would have to find a frame builder and see if I could have a custom made fork. Probably would be cost prohibitive.
    http://www.ebikestop.com/dimension_c...ses-FK1268.php

    +

    a new 1 inch threadless headset will probably be far cheaper than custom if the other fork dimensions/geometry work
    Last edited by erik c; 07-06-10 at 03:47 PM.

  6. #6
    Randomhead
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    I'm told this part will keep the fork blade from un-raking. You bend the long part around the rake of the blade

    I always hate to see the words "nice steel vintage bike" along with plans of radical modifications. I guess it depends on what kind of bike it really is.

  7. #7
    coprolite fietsbob's Avatar
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    Consider a Drum brake front hub instead, More progressive, all weather braking, and no modifications needed.
    just a band that wraps around the fork-blade 6 inches up, for the reaction strut.

  8. #8
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    I'd still be afraid the crown would fail with even the pragon part.

  9. #9
    coprolite fietsbob's Avatar
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    Getting away from discs, I've been Using a Tange sloping crown fork, 80's era
    on the Stumpjumper rescue frame project winter bike,
    Riding it for Many Years, No problems , My drum Brake hubs have been trouble free for 20 years.. shoes don't wear out ..

    taking a page from history , you could have a bracing strut added from the dropout to the top of the fork steerer, that what Motorcycles did , back in the day.
    Last edited by fietsbob; 07-07-10 at 03:45 PM.

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