Cracked chain stay-
Results 1 to 7 of 7
  1. #1
    mtbr member
    Join Date
    Sep 2018

    Cracked chain stay

    So I've been asked to repair a frame for a friend.
    This isn't a should it be repaired question... it's getting repaired.
    My question is how. The frame is a 4130 single speed and the crack seems to have started from the tire clearance dimpling in the non drive chain stay. I have access to oxy accetelene or tig. Easiest option I think it to drill the ends of the crack and tig it. Option two is to make a bow tie /dog bone shaped gusset and braze that over the top of the crack. I feel option two is probably the best way for a longer lived repair. But I thought I'd open myself up to some general burning at the stake via Internet forum. thanks Pete.

  2. #2
    mtbr member
    Join Date
    Dec 2012
    Replace the tube?

  3. #3
    mbtr member
    Reputation: scottzg's Avatar
    Join Date
    Sep 2006
    Quote Originally Posted by Peter Jefcoate View Post
    But I thought I'd open myself up to some general burning at the stake via Internet forum.
    You've come to the right place!

    But ya, like brider said, replace the chainstay. The repair options you propose never seem to work as a long term solution.

    Who dimples a NDS chainstay?
    "Things that are complex are not useful, Things that are useful are simple."
    Mikhail Kalashnikov

  4. #4
    Location: 10 ft from Hell Moderator
    Reputation: life behind bars's Avatar
    Join Date
    May 2014
    Replace. Generally speaking, if you can't find a suitable replacement, replace them both.
    I ncredibly
    M yopic
    B ackstabbing
    A ssholes

  5. #5
    mtbr member
    Join Date
    Dec 2006
    Iíve no idea whatís best! You got any pictures?

  6. #6
    mtbr member
    Join Date
    Jul 2010
    Like others have said, replacing the CS would be the best solution. I don't think you need to drill the ends of the crack. Just tig weld a little beyond where it's visible. Chances of that lasting long term are low, but you could just braze a gusset over the top of the tig weld and that might fairly well. Careful how your gusset is shaped though, because it's going to cause stress risers.

    Have fun!
    Myth Cycles handbuilt bike frames
    Durango, CO

  7. #7
    mtbr member
    Join Date
    Dec 2013
    Option #1 Tig weld it and overlap it with suitable metal.
    Option #2 Braze same method

    Do you Tig weld better then you braze, because brazing is a friggin art form.

Similar Threads

  1. Transition Bandit cracked chain stay, common??
    By outtacontrol in forum 29er Bikes
    Replies: 11
    Last Post: 09-22-2016, 11:37 PM
  2. Chain stay cracked on '11 Epic Comp 29er
    By IndyDave in forum Specialized
    Replies: 21
    Last Post: 09-05-2016, 10:06 PM
  3. Chain Stay Protector or No Chain Stay Protector?
    By 6guitars in forum General Discussion
    Replies: 76
    Last Post: 02-23-2013, 03:13 PM
  4. Cracked Chain Stay on Vertex 990 RSL
    By joncgould in forum Rocky Mountain
    Replies: 1
    Last Post: 08-29-2012, 05:20 AM
  5. Bummer, cracked my Id chain stay
    By vibiker in forum Ellsworth
    Replies: 19
    Last Post: 05-17-2005, 08:18 AM

Members who have read this thread: 2

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts




© Copyright 2020 VerticalScope Inc. All rights reserved.