Advertise on Bikeforums.net



User Tag List

Results 1 to 17 of 17
  1. #1
    Senior Member shipwreck's Avatar
    Join Date
    Mar 2009
    Posts
    776
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)

    Installing a crank that already has stripped removal threads.

    I bet its happened to a lot of us, at least once, spinning the removal tool thinking everything is hunky dorry and then seeing that it is in fact just shaving the threads.

    Well, it happened to me at least, some time ago, and I just used another crank to replace it after I go it off with a steering wheel remover. Now i am putting together a fastish utility bike and was thinking about using that crankset. Its ok exept for the threads.

    Do you just trash them? is there a trick to make them removable again for service?

  2. #2
    likes to ride an old bike
    Join Date
    Dec 2010
    Location
    Madison
    Posts
    673
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You might be able to heli-coil it; I don't know about the availability of that size and threading.

    Maybe just use a good quality cartridge bottom bracket that won't need service for a really long time? You'd have to remove it with a pickle fork again some day. But, you got it off that way once without damage. :-D

  3. #3
    Stop reading my posts! unworthy1's Avatar
    Join Date
    Sep 2004
    Posts
    8,050
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MrEss View Post
    You might be able to heli-coil it; I don't know about the availability of that size and threading.

    Maybe just use a good quality cartridge bottom bracket that won't need service for a really long time? You'd have to remove it with a pickle fork again some day. But, you got it off that way once without damage. :-D
    there is a repair kit that allows for oversize threads to be cut, then a bigger remover must be used...also pretty expensive so only for some crank of real value.
    There's a simple technique of just riding the bike with crank bolts removed in a safe flat place (empty parking lot) until you feel the cranks go loose and wobbly...works about 80% of the time, but the spindle hole will probably be toast afterward.

  4. #4
    Senior Member
    Join Date
    Oct 2010
    Posts
    1,009
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    What about using a small crank puller. They come in 2, 3 & 4 arm configurations. They are not expensive either. Just put something in front of the spindle bolt hole so you won't bung up the threads.

  5. #5
    Too many bikes bikemore's Avatar
    Join Date
    Apr 2006
    Location
    Boston MA
    Posts
    1,205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've trashed one or two. I am willing to go with a non-match arm in a lot of cases, so YMMV. On at least one of there were lots of dent marks on the back. If you can find a wide blade crow bar that might fit. Auto repair tools?

  6. #6
    DRF aka Thrifty Bill wrk101's Avatar
    Join Date
    Jan 2008
    Location
    The NC Mountains
    My Bikes
    Too many to list, all vintage
    Posts
    18,804
    Mentioned
    24 Post(s)
    Tagged
    1 Thread(s)
    You can buy a traditional puller (made for working on cars). I picked one up at a garage sale. I would not sell a bike with stripped crank threads, but I would probably use it on a utility bike as you describe.

  7. #7
    Cottered Crank Amesja's Avatar
    Join Date
    Aug 2010
    Location
    Chicago
    My Bikes
    1954 Raleigh Sports 1974 Raleigh Competition 1969 Raleigh Twenty 1964 Raleigh LTD-3
    Posts
    3,348
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Gear puller.

    Not as handy or slick as a threaded crank-pulling tool but it gets the job done.
    '74 Raleigh Carlton Competition w/ Ultegra | '97 Trek 720 Singletrack CX-er w/ 105 | '64 Raleigh LTD-3 modernized w/ all alloy components |'69 Raleigh Twenty | '54 Raleigh Sports

  8. #8
    Senior Member BigPolishJimmy's Avatar
    Join Date
    May 2008
    Location
    Southwest Michigan
    My Bikes
    Fuji Monterey, Schwinn Traveler, Fuji Special Road Racer, Gitane Interclub, Sun EZ-1, Schwinn Frontier, Puch Cavalier, Vista Cavalier, Armstrong, Raleigh Sports, Schwinn Stingray
    Posts
    1,557
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I was also going to suggest a gear puller but I have never used one. I would expect them to mark up the crans a bit and perhaps be a bit hard on the teeth. You might want to remove the chainrings prior to using the tool. If it were me, once the crank is trashed I would only consider using it on a beater bike where any extra marks are just added charm.

  9. #9
    Senior Member robbied196's Avatar
    Join Date
    Dec 2010
    Location
    Englandshire UK
    My Bikes
    Harry Hall, Vitus 979, Viscount Aerospace, Dawes Galaxy
    Posts
    213
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You're not alone, I did the very same thing last weekend, in a rush and thought 5 or 6 turns in with the crank tool would be ok, I wind away and out it pops wrapped in aluminium

  10. #10
    Senior Member
    Join Date
    Oct 2010
    Posts
    1,009
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The riding the bike until the cranks wobble loose sounds like a good backup plan.

  11. #11
    Beach-Bound Collin2424's Avatar
    Join Date
    Oct 2009
    Location
    Bay Area, California
    Posts
    650
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hmmm, I've got a Suntour Sprint crank with a stripped NDS removal thread. Maybe I'll use it on something after all? I was about to toss it.

    -Collin-

  12. #12
    Senior Member shipwreck's Avatar
    Join Date
    Mar 2009
    Posts
    776
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Thanks for all the replies. sounds like I wont be to off the mark using the crank on a beater/utility bike. it will have a cheap cartridge bb, and I will just use it till it dies. Then worry about that when it comes. I have used the gear puller lots of times.

    As a strong believer in brute strength and ignorance there are no real worrys about getting it off. I just wondered about options and what others do.

  13. #13
    Senior Member Capecodder's Avatar
    Join Date
    Jul 2010
    Location
    Somewhere Between The Beginning And The End
    Posts
    1,991
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Drill chuck removal wedges work great.... http://www.jacobschuck.com/drill-chuck-install.asp
    Amy, I'll always remember you...... I miss you so much, for you filled my days with so much joy.

  14. #14
    Stop reading my posts! unworthy1's Avatar
    Join Date
    Sep 2004
    Posts
    8,050
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Capecodder View Post
    Drill chuck removal wedges work great.... http://www.jacobschuck.com/drill-chuck-install.asp
    Hah, I wondered what those things were for...now I know, and it all makes sense. Thanks for solving one of life's little mysteries.

  15. #15
    Senior Member
    Join Date
    Aug 2009
    Location
    Madison, WI
    Posts
    2,335
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Especially with a cheap cartridge BB, if all else fails you can just use a hack saw on the spindle to get it off when the BB wears out.

  16. #16
    Muscle bike design spec robtown's Avatar
    Join Date
    Oct 2004
    Location
    Sterling VA
    My Bikes
    98 Giant CFR-TEAM, 00 Lemond, 08 Kestrel Evoke, 96 Colnago Master Olympic, 01 Colnago Ovalmaster, Raleigh Gran Sport, 03 Fuji World, 86 Paramount, 90 Miyata CF, 09 Ritchey Breakaway CX, Bianchi Trofeo, 12 HyperLite
    Posts
    3,645
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks guys! My extractor wouldn't thread into the non-drive side of a Peugeot's crank this morning and the threads stripped out. The first time this happened I had left the washer in the crank - this time I checked.
    I'll let you know how the gear puller works.
    Korval is Ships
    See my Hyperlite 411 it's the photo model on OutRiderUSA web page

  17. #17
    Cottered Crank Amesja's Avatar
    Join Date
    Aug 2010
    Location
    Chicago
    My Bikes
    1954 Raleigh Sports 1974 Raleigh Competition 1969 Raleigh Twenty 1964 Raleigh LTD-3
    Posts
    3,348
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Another fumble is not screwing the center-pin back in the extractor before threading it into the crank This gives a "false bottom" that lets one believe they have threaded it in enough but it will strip out.

    The other day I almost forgot to unscrew the bolt in a crank before threading in the extractor. THAT wouldn't have worked so well!
    '74 Raleigh Carlton Competition w/ Ultegra | '97 Trek 720 Singletrack CX-er w/ 105 | '64 Raleigh LTD-3 modernized w/ all alloy components |'69 Raleigh Twenty | '54 Raleigh Sports

Posting Permissions

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