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  1. #1
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    Welding a disc brake tab to my 99 Dakar

    I have a 99 Jamis Dakar that has no rear brake tab. I know its possible to weld a tab onto my bike but in all the pics I have seen (like the first one from mikeT's Magura Cult site) they have added a brace between the seat and chain stays.

    My bike has a pivot between the seat and chain stays (as you can see in the next pic), so my question is: Do I need to weld that brace in or can I go without?

    Thanks,
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    Last edited by jakey; 03-24-2004 at 10:35 AM.

  2. #2
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    if that Jamis is aluminum

    you can't weld it. Correct me if I'm wrong, but the pic of Mike's bike is a steel frame and it can be welded. Aluminum weakens during the process.

    Means:

    1) new bike
    2) Brake Therapy adapter at about $300 (therapy-components.com)
    3) new rear end from Jamis if it fits, with disc tabs

    Just my thoughts, Jim

  3. #3
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    Disc Brake Adapter

    You may be interested in our DM-UNI Universal Disc Brake Mount Adapter.

    www.discbrakeadapters.com

  4. #4
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    The 99 was steel

    Quote Originally Posted by JimC.
    you can't weld it. Correct me if I'm wrong, but the pic of Mike's bike is a steel frame and it can be welded. Aluminum weakens during the process.

    Means:

    1) new bike
    2) Brake Therapy adapter at about $300 (therapy-components.com)
    3) new rear end from Jamis if it fits, with disc tabs

    Just my thoughts, Jim
    Does that mean I can weld it?

  5. #5
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    I'm no expert

    IMHO I'd look hard at that other post with a bolt on adapter. Might be less problematic and stressful.bottom line: I don't know.

    Jim

  6. #6
    mmm, carbon
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    This is my effort on an aluminium rear end. I have no brace at all thanks to the awkwardly placed pivot and this has been fine for the past 18 months. I'd hesitate putting more than a 160mm rotor on it though, it does flex a bit.

    Bottomline: I think you can safely get away without the brace.

  7. #7
    Tear it all out! SuperModerator
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    If the seatstay (or chain stay depending on the design of your frame) is steel, a frame builder can add a mount fairly easily. You probably don't want to weld it, but braze it instead.

    Here in Vancouver the cost to add a mount to a steel HT is about $100 plus paint.

  8. #8
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    Quote Originally Posted by jakey
    I have a 99 Jamis Dakar that has no rear brake tab. I know its possible to weld a tab onto my bike but in all the pics I have seen (like the first one from mikeT's Magura Cult site) they have added a brace between the seat and chain stays.

    My bike has a pivot between the seat and chain stays (as you can see in the next pic), so my question is: Do I need to weld that brace in or can I go without?

    Thanks,
    You could tig weld a brace on there, but the seat stay joint probably won't hold up to the stress without a brace. You could probably fill in the space between the pivot and the seat stay with some sort of brace. It also depends what you plan to do with the bike, if it is just XC you may get away without one...maybe. Like Jim said you could check to see if there is a replacement swingarm that has disc tabs, or the A2Z is also a nice option, there is also the Hammerhead and Brake Therapy. Last resort is weld one with that frame IMHO, unless you decide to add a brace.
    Pat T.

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