Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 49
  1. #1
    Member
    Join Date
    Dec 2008
    Location
    New York
    Posts
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    AL Head Tube Cracked!

    While cleaning my bike the other day I discovered this...


    FWIW, the frame is a 7005 aluminum, circa 1995 Crestone Peak Hard-tail with an AMP fork. Crestone Peak existed for about 10 minutes, not that I'd expect much manufacturer support on a 15 year-old bike.

    Suggestions?
    Brad

  2. #2
    Senior Member brockd15's Avatar
    Join Date
    Dec 2008
    Location
    Frisco, TX
    Posts
    1,131
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    I think you've got a great excuse to start frame shopping.

  3. #3
    Senior Member
    Join Date
    Apr 2006
    Posts
    2,213
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    A good aluminum heli arc welder could fix it but i will cost more than the bike is worth. Roger

  4. #4
    AEO
    AEO is offline
    Senior Member AEO's Avatar
    Join Date
    Jun 2007
    Location
    A Coffin Called Earth. or Toronto, ON
    My Bikes
    Bianchi, Miyata, Dahon, Rossin
    Posts
    12,255
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    yep, toast.
    time for a new ride. Be picky and buy a bike that doesn't have the same issues, if any, your cracked one has.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  5. #5
    Can'tre Member 3alarmer's Avatar
    Join Date
    Nov 2010
    Location
    ,location, location...
    My Bikes
    old ones
    Posts
    9,866
    Mentioned
    185 Post(s)
    Tagged
    4 Thread(s)

    An Excuse for a New Bicycle

    Quote Originally Posted by brockd15 View Post
    I think you've got a great excuse to start frame shopping.
    Good thing you noticed this before Christmas.
    You now have something to tell people when
    they ask what you need. Hint: it is not a
    heliarc welder.

    Mike Larmer
    Quote Originally Posted by CKey_Cal View Post
    Lawlessness is illegal.

  6. #6
    Senior Member skilsaw's Avatar
    Join Date
    Jul 2010
    Location
    Victoria, Canada
    My Bikes
    Cannondale t1, Koga-Miyata World Traveller
    Posts
    1,546
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If Santa brings you coal, instead of a new bike,
    I think you could continue to ride that bike for some time.
    I don't think it will lead to a catastrophic failure where
    you shoot forward off the bike to kiss the earth.

    But, if you are like me, any excuse is a good excuse to buy a new bike.
    The one who has the most bikes wins.

  7. #7
    Senior Member longbeachgary's Avatar
    Join Date
    Sep 2008
    Location
    Beautiful Long Beach California
    My Bikes
    Eddy Merckx MXL; 2012 CAAD10; 2013 CAAD10 - The Silver and Black; Cannondale CAAD10 DI2 - The Black Dahlia; 2013 Cannondale CAAD10 DI2, The Black Mambo
    Posts
    3,273
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My daughter's 6 year old Specialized Allez developed a crack like that and Specialized replaced it free of charge. Lots of frames have a lifetime warranty to the original owner.

  8. #8
    AEO
    AEO is offline
    Senior Member AEO's Avatar
    Join Date
    Jun 2007
    Location
    A Coffin Called Earth. or Toronto, ON
    My Bikes
    Bianchi, Miyata, Dahon, Rossin
    Posts
    12,255
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by skilsaw View Post
    If Santa brings you coal, instead of a new bike,
    I think you could continue to ride that bike for some time.
    I don't think it will lead to a catastrophic failure where
    you shoot forward off the bike to kiss the earth.

    But, if you are like me, any excuse is a good excuse to buy a new bike.
    nah, that'll split right down the middle and shatter into a million pieces on the first bump it hits.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  9. #9
    Senior Member Flying Merkel's Avatar
    Join Date
    Mar 2008
    Location
    Costa Mesa CA
    Posts
    2,574
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My Specialized Rockhopper developed the identical crack. They gave me a replacement frame 12 years after original purchase. Yer frame is copulated. Re-place

  10. #10
    Guest
    Join Date
    Jul 2008
    Location
    Grid Reference, SK
    My Bikes
    I never learned to ride a bike. It is my deepest shame.
    Posts
    3,769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    New frame. It might last for a long time before the crack spreads, or the crack might suddenly wrap around to the weld and the cause the headtube to fall off and send you underneath a bus. 15 years is a reasonable life span for a lightweight frame.

  11. #11
    Senior Member Chombi's Avatar
    Join Date
    Jul 2009
    My Bikes
    1986 Alan Record Carbonio, 1985 Vitus Plus Carbone 7, 1984 Peugeot PSV, 1972 Line Seeker, 1986(est.) Medici Aerodynamic (Project), 1985(est.) Peugeot PY10FC (Project)
    Posts
    9,551
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DPDISXR4Ti View Post
    While cleaning my bike the other day I discovered this...


    FWIW, the frame is a 7005 aluminum, circa 1995 Crestone Peak Hard-tail with an AMP fork. Crestone Peak existed for about 10 minutes, not that I'd expect much manufacturer support on a 15 year-old bike.

    Suggestions?
    That's a goner....The way it looks, that crack goes well into the tube to the interior wall of the head tube for sure. You'll have to do full penetration welding and filling to get that close to it's original stregnth, and that will require a lot of prepr work and grinding/filing down to original shapes/profiles so you can re-install a headset = more than the bike is worth, most likely. I guess that's the end of your long relationship with Crestone Peak........unless you find a used one to replace this one...Make sure you check the head tube on it very carefully if you do so....

    Chombi

  12. #12
    Member
    Join Date
    Dec 2008
    Location
    New York
    Posts
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rhenning View Post
    A good aluminum heli arc welder could fix it but i will cost more than the bike is worth. Roger
    Why are you thinking that Roger? I forget what the frame cost - couple hundred, and it's otherwise still in perfect shape.
    Brad

  13. #13
    Guest
    Join Date
    Jul 2008
    Location
    Grid Reference, SK
    My Bikes
    I never learned to ride a bike. It is my deepest shame.
    Posts
    3,769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Not what the frame cost but what it would cost to replace it... a similar era good quality aluminum frame would be cheap used, and a modern basic frame (likely similar quality) can cost very little as well... Maybe $300 for a non-branded or lesser known brand or $300 for one with a brand name on it.

  14. #14
    Senior Member
    Join Date
    May 2008
    Location
    SoCal
    Posts
    1,247
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    doesnt nashbar have generic frames for about $100

  15. #15
    Member
    Join Date
    Dec 2008
    Location
    New York
    Posts
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by merlin55 View Post
    doesnt nashbar have generic frames for about $100
    Probably, but I'm not looking to downgrade - this frame is somewhat unique. I'm thinking a reinforcement plate over the repair would help in ensure that a catastrophic failure wouldn't (most likely) happen.
    Brad

  16. #16
    Senior Member
    Join Date
    Apr 2009
    Location
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    Posts
    22,435
    Mentioned
    67 Post(s)
    Tagged
    1 Thread(s)
    If you want to keep this going as a "B" bike you can do a down 'n dirty ugly repair with a $1.50 hose clamp. Knock out the upper cup, run some acetone into the crack to clean it, then apply a hose clamp to tighten it closed.

    Unfortunately the super glue won't be strong enough so you'll have to leave the clamp on permanantly (I didn't say it would be pretty). If you want to do a nicer job, replace the clamp with a machined SS collar with a slight interference fit and a wall thickness of about 0.060" to 0.080". Consider making 2 of the collars, and add one to the bottom to shore that end up.

    Also after it's clamped and glued, and the glue has set have someone ream the headtube to spec. It's likely the ID is at the low end of the range and excess interference in the cups fit contributed to the failure (that and age).
    FB
    Chain-L site

    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  17. #17
    Senior Member
    Join Date
    Feb 2009
    Posts
    4,146
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Aluminum has a finite number of flexes before it cracks. If you have had it for 15 years I would say you have gotten your money's worth. Even if you have it welded it will crack somewhere else.
    Get a new one.

  18. #18
    Guest
    Join Date
    Jul 2008
    Location
    Grid Reference, SK
    My Bikes
    I never learned to ride a bike. It is my deepest shame.
    Posts
    3,769
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by DPDISXR4Ti View Post
    Probably, but I'm not looking to downgrade - this frame is somewhat unique. I'm thinking a reinforcement plate over the repair would help in ensure that a catastrophic failure wouldn't (most likely) happen.
    Unlikely it would be a 'downgrade.' The $100 Taiwanese frame today is as good or better than the mid-quality aluminum from 15 years ago. For $100 you will likely get a butted, shaped tubing aluminum frame that has been heat treated and possibly powder coated. Lighter and stronger that what you have, probably. Aluminum from yesteryear had a bit of a reputation for cracking but not so much any more. I'm not saying your repair plan won't work, just that you get a lot ofr your $100 these days. And I am not generally of the mind that 'newer' = 'better' but in this case it likely does.

  19. #19
    Member
    Join Date
    Dec 2008
    Location
    New York
    Posts
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the feedback. I'd actually been thinking about using structural adhesive along with some AL sheeting and a hose clamp. I've recently built a car with that stuff, so why not a bike?
    Brad

  20. #20
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,145
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    Apparently you don't want to hear that the frame should be replaced so go ahead with whatever repair you deem suitable and safe. If it were mine, it would be gone immediately. I can't believe that frame has any particular and superior features that can't be replicated in a newer, probably better made, frame at reasonable cost.

  21. #21
    Senior Member
    Join Date
    Jan 2010
    Location
    Jacksonville, FL
    Posts
    50
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    durafix

    if you want to try to save the frame, this might work in combo with drilling a hole to stop the crack.

    http://durafix.com/

  22. #22
    Old fart JohnDThompson's Avatar
    Join Date
    Nov 2004
    Location
    Appleton WI
    My Bikes
    Several, mostly not name brands.
    Posts
    13,108
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rhenning View Post
    A good aluminum heli arc welder could fix it but i will cost more than the bike is worth. Roger
    IIRC, 7nnn series aluminum needs to be heat treated after welding.

  23. #23
    Member
    Join Date
    Dec 2008
    Location
    New York
    Posts
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by JohnDThompson View Post
    IIRC, 7nnn series aluminum needs to be heat treated after welding.
    Well, that would kill off any lingering thoughts on welding.

    I started disassembling the head-set tonight - thought it best to start a new thread on my issue there, as it's more of a generic repair question - here's the direct link to it...
    http://www.bikeforums.net/showthread...3#post11876993
    Brad

  24. #24
    AEO
    AEO is offline
    Senior Member AEO's Avatar
    Join Date
    Jun 2007
    Location
    A Coffin Called Earth. or Toronto, ON
    My Bikes
    Bianchi, Miyata, Dahon, Rossin
    Posts
    12,255
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    on an airplane, you'd drill a hole at the end of the crack to stop it from propagating and then glue on a doubler plate, while holding it in place with rivets.
    not that you'd be able to translate that directly to bikes, but the idea isn't so different.
    Food for thought: if you aren't dead by 2050, you and your entire family will be within a few years from starvation. Now that is a cruel gift to leave for your offspring. ;)
    http://sanfrancisco.ibtimes.com/arti...ger-photos.htm

  25. #25
    Member
    Join Date
    Dec 2008
    Location
    New York
    Posts
    39
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AEO View Post
    on an airplane, you'd drill a hole at the end of the crack to stop it from propagating and then glue on a doubler plate, while holding it in place with rivets.
    not that you'd be able to translate that directly to bikes, but the idea isn't so different.
    I think it translates pretty well for this. It's more or less the approach I'm considering - structural adhesive with mechanical fasteners as secondary.
    Brad

Page 1 of 2 12 LastLast

Posting Permissions

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