cracked non driveside chainstay repair-
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  1. #1
    Heads up Flyboy!!
    Reputation: mountaingoatepics's Avatar
    Join Date
    Jan 2004

    cracked non driveside chainstay repair

    Hey fellas,

    I've got a True Temper steel frame with Paragon sliders that has a small crack at the weld where the slider meets the bottom of the chainstay. I was hoping the crack could be filled with some Silver and then add a brake brace to repair it. What do you guys think?

    sanded to be sure, the horizontal line is the crack

    <a href="" title="chainstay crack by Goat in a Turtle Shell, on Flickr"><img src="" width="640" height="479" alt="chainstay crack"></a>

    a picture of the sliders new for reference

    <a href="" title="Paragon Sliders by Goat in a Turtle Shell, on Flickr"><img src="" width="640" height="480" alt="Paragon Sliders"></a>

  2. #2
    mtbr member
    Join Date
    Sep 2005

    Silver and a brace will only gain you a bit more time.

    The definitive fix will be to cut the stay back .625" and clean off the dropout. Fire up the lathe and machine a plug with a chamfered end to fit the id of the stay, extending in about .500 and then slot the dropout end min of 12mm for the dropout interface. Scallop or finish the dropout end to your liking. Weld/braze it up for a much stronger connection than the original fabrication.

    The first build I ever used Mark's sliders on was a Rohloff/disc build for myself many many years ago. The forward stress on the stays from the cumulative energy of both the disc and the hub torsion caused a similar failure after about 3 years. This fix will last the lifetime of the frame.


    As requested by the MTBR gods, I am the voice of Groovy Cycleworks, check it out...

  3. #3
    mtbr member
    Join Date
    Jan 2008
    Has the frame been abused by someone whilst locked up??

    I have never seen any welding crack in such a strange way. The weak point which goes first is always along the edge of a weld rather than clean across both weld and tube.

    I would be very sceptical of possible vandalism!

  4. #4
    mtbr member
    Reputation: coconinocycles's Avatar
    Join Date
    Sep 2006
    I'd bet it's only filled with silver to that point. - Steve Garro, Coconino Cycles.
    steve garro el jefe/el solo. coconino cycles

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