Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Senior Member ecp8's Avatar
    Join Date
    Jan 2007
    Location
    brighton
    Posts
    123
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    New life for stripped crankset

    I'm building a fixed gear polo bike on the cheap and have been pulling parts from my parts box to put on a sturdy lugged omega frame I found. I have a truvativ fixed gear crankset with one stripped pedal thread, Is there hope for salvaging this crankset? Does locktight work? Or is there a liner that can be used? This is not going to be a commuter or real road bike - just a knock about polo bike.

  2. #2
    sch
    sch is offline
    Senior Member
    Join Date
    May 2003
    Location
    Birmingham. AL
    Posts
    2,586
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    In theory inserts could be placed to repair the thread. Locktite, short
    of the industrial strength stuff needing an oxy torch to remove is unlikely to work.
    JB Weld is similar and worth a try but really, surplus old cranks are a 'dime a dozen'
    if you check LBS where cast offs stack up and should be available cheaper than
    a 1/2 donkey solution, especially if the L crank is involved. If you gamble on JB
    or heavy duty locktite, adding a couple of allen set screws on either side by
    drilling and tapping the 9:00 and 3:00 positions or at least the 6:00 position to
    help lock the shaft in place. I doubt any of the epoxy variants are strong enough
    for this duty though.

  3. #3
    Wrench User
    Join Date
    Nov 2007
    Posts
    126
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by sch View Post
    If you gamble on JB
    or heavy duty locktite, adding a couple of allen set screws on either side by
    drilling and tapping the 9:00 and 3:00 positions or at least the 6:00 position to
    help lock the shaft in place. I doubt any of the epoxy variants are strong enough
    for this duty though.
    If you're just cruising - no standing climbs - this has been proven effective if done right. I just did the 6:00, but maybe 9, 6, and 3 would be good to add some stability in all directions.

  4. #4
    Senior Member
    Join Date
    Aug 2007
    Posts
    473
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    left or right crank?

    left cranks are a dime a dozen, just replace with another left crank of the same length. cheap.

  5. #5
    sch
    sch is offline
    Senior Member
    Join Date
    May 2003
    Location
    Birmingham. AL
    Posts
    2,586
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    My set screw/JB weld offering was tongue in cheek, I don't really advise
    doing this. Surplus cranks are not hard to find and there is no great virtue in
    fixie cranks unless you are a clyde or 400watt type. It was offered in a
    spirit of Make magazine.

  6. #6
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
    Location
    Dallas
    My Bikes
    03 Raleigh Professional (steel)
    Posts
    6,887
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Your LBS can repair the stripped crank at small cost ($10?).
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  7. #7
    surly old man jgedwa's Avatar
    Join Date
    Sep 2006
    Location
    Carlisle, PA
    My Bikes
    IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
    Posts
    3,268
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Not even the strongest locktight will hold in this application for long. I would doubt that JBWeld would either, since it is just epoxy which has low shear strength.

    LBS can put a heliocoil in for not much money. Or find another random arm and put it on there.
    Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
    --------------------------
    SB forever

  8. #8
    Team Beer Cynikal's Avatar
    Join Date
    Apr 2004
    Location
    Sacramento CA
    My Bikes
    Too Many
    Posts
    5,747
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    retap it to the BMX standard.

  9. #9
    Senior Member ecp8's Avatar
    Join Date
    Jan 2007
    Location
    brighton
    Posts
    123
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the advice. I'll check the LBS for retapping. It looks like there's a market for orphan crank arms out there.

Posting Permissions

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