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Thread: cracked frame

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    cracked frame

    I have a great old bianchi lugged steel road bike from the 1980's, but there has been a disturbing development. It seems to have developed a hairline fracture in the bottom bracket lug, about an inch and a half horizontally (i.e. from the left crank towards the right crank, right on the bottom). What is the prognosis for my italian beauty? I know that it's unsafe to ride a cracked frame, but do you guys think I'm in imminent danger? I have a co-worker that does some welding, and I'm thinking of seeing if he'll repair it, but he knows nothing about bikes. Would he be able to accomplish this? Any guidelines I would give him? How much would I expect to pay a bike shop for the job, and is this the right solution?

    Thanks

    Josh

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    Addicted to Tinkering NuTz4BiKeZ's Avatar
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    Hey Josh

    I'm no expert but if it was my bike I'd talk to someone that was knowledgable about welding.
    Because the makeup of the tube (ie the carbon content of the steel) used can affect the strength and durability of the weld it's important to have it done properly.
    A friend would bail you out of jail... A good friend sits there beside you and says "Damn that was fun"

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    Carfree Retro Grouch hayneda's Avatar
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    If it's a lugged frame it's brazed not welded. Welding in not compatable with all steels since it can significantly lower the stength. Your best bet is to have a framebuilder replace the BB shell. It's a simple enough job and you can get a nice new paint job as well.

    Dave
    Bikes are either fixed or broken

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    Forum Admin lotek's Avatar
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    Josh,

    Yes it is repairable, but I would have it sent
    to a reputable frame maker to do so
    (I know of a few that do this kind of thing).
    Agree that welding is NOT a good idea,
    a framebuilder will remove the tube (its the
    seatube and not the BB right?), and replace
    it, repaint etc.
    If its the bottom bracket shell I'm not sure.
    I can ask around on that one.

    Marty
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    Senior Member diamondback's Avatar
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    is this economically advisable, no matter how much money is put into a 1980's steel bike its value doesn't change.

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    Lagomorph Demonicus stumpjumper's Avatar
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    is this economically advisable, no matter how much money is put into a 1980's steel bike its value doesn't change.
    I'm assuming you ride your bike because you realy like it, not due to its value but he does have a point. On the other hand, the cost of the repair should still be less than going out and buying a comparable frame.

    If she's your baby, then I say send her off to a framemaker for the repair.
    Lord Bowler: Uh oh. You hit the sheriff
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    Lagomorph Demonicus stumpjumper's Avatar
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    By the way, I just noticed your full username and wanted to say...

    SOYLENTJOSH IS MADE OF PEOPLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Lord Bowler: Uh oh. You hit the sheriff
    Brisco County Jr.: Yeah, but I did not hit the deputy.

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    It actually is the bottom bracket shell and not the seat tube. Does anyone know what price range this kind of repair is in?

    Thanks!
    Josh

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    The Flying Scot chewa's Avatar
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    Originally posted by stumpjumper
    By the way, I just noticed your full username and wanted to say...

    SOYLENTJOSH IS MADE OF PEOPLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Only in the film.
    plus je vois les hommes, plus j'admire les chiens

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    Forum Admin lotek's Avatar
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    Josh,

    A cracked bottom bracket shell is a bit more
    complicated, have to remove seat, and downtubes and
    chainstays. I'm guessing it can be done.
    (I've started a query with some framebuilders)
    Can you post pictures?
    I'm guessing it wouldn't be cheap.
    What model Bianchi? Superleggera?
    if anything less than Campione I'd say probably not
    worth it.
    I'll let you know what I hear from framebuilders.
    thanks,
    Marty
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    The Flying Scot chewa's Avatar
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    I think I've seen on the Mercian site a price quoted for replacement of a BB shell
    plus je vois les hommes, plus j'admire les chiens

    1985 Custom built 531c Audax/fast tourer.
    1964 Flying Scot Continental
    1995 Cinelli Supercorsa
    1980s Holdsworth Mistral fixed
    2005 Dahon Speed 6 (folder)
    (YES I LIKE STEEL)
    2008 Viking Saratoga tandem
    2008 Micmo Sirocco Hybrid (aluminium!)
    2012 BTwin Rockrider 8.1

  12. #12
    Forum Admin lotek's Avatar
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    I got a few responses
    if I may quote

    Oh, it can be done... It's just "can you stand the tariff?"
    Dale Brown
    cycles de ORO, Inc.

    "it's do-able but would cost more than the cost of the frame."
    Richard Sachs
    (yah that Richard Sachs).


    Marty
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  13. #13
    The Flying Scot chewa's Avatar
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    Mercian quote £60 for a replacement BB shell and bridge ($100)

    http://www.btinternet.com/~merciancy...es/repairs.htm
    plus je vois les hommes, plus j'admire les chiens

    1985 Custom built 531c Audax/fast tourer.
    1964 Flying Scot Continental
    1995 Cinelli Supercorsa
    1980s Holdsworth Mistral fixed
    2005 Dahon Speed 6 (folder)
    (YES I LIKE STEEL)
    2008 Viking Saratoga tandem
    2008 Micmo Sirocco Hybrid (aluminium!)
    2012 BTwin Rockrider 8.1

  14. #14
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    Bob Jackson do it for

    New Bottom Bracket Shell(Pressed) £68.75
    New Bottom Bracket Shell(Cast) £93.00

    http://www.bobjacksoncycles.co.uk/repairs.htm
    but you have to repaint the bike as well.

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    Ugh...maybe I should investigate a new frame. Too bad. I'll start looking on ebay, but does anyone know a good deal on cheap frames?

    Thanks!
    Josh

  16. #16
    auger
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    j b weld yoour hairline crack its not worth anymore effort than that really if the crack is in the lug ride it till ya cant ride it no more lol

  17. #17
    Forum Admin lotek's Avatar
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    Josh,

    Well its interesting, I've gotten a few responses from
    other framebuilders who say that the BB shell can
    be Welded, so it might be worthwhile to have a builder
    look at the frame.
    One thing is certain is that everyone said not to do
    it yourself unless you really know what you're doing.

    There are some nice frames out there,
    check RBR, Rec.bicycles and of course e-buy.

    Marty
    Sono pił lento di quel che sembra.
    Odio la gente, tutti.

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