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  1. #1
    Oh boy
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    Gnarly FGG Action

    did anyone else see this jacked-up frame?

    http://www.fixedgeargallery.com/2005/mar/Cb.htm


    Steel is Real!

  2. #2
    Wher'd u Get That Jacket? flythebike's Avatar
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    Aluminum breaks. It has a finite fatigue life. It gets weaker and weaker throughout its life the more fatigue cycles it goes through and then it breaks. So you have to overbuild it to begin with to compensate for it getting weaker later on. That is the tradeoff for its light weight and reatively affordable nature.

    If you want a frame that won't fail catastrophically, you'd better go with steel, titanium, or carbon.
    WeBlog: http://flythebike.blogspot.com
    "Then know, that I have little wealth to lose. A man I am, crossed with adversity; My riches are these poor habiliments, Of which if you should here disfurnish me, You take the sum and substance that I have." Shakespeare: The Two Gentlemen of Verona
    Calfee Dragonfly Record, Calfee Luna Fixie T/A, Level, Campy Cervelo P3SL Campy, Lemond Poprad Campy, Fisher X-Calibur

  3. #3
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    I think the problem was beacuse, as the owner wrote, that it broke in the exact spot where a bolt was. The frame material being aluminum probably didn't help either....

  4. #4
    Cornucopia of Awesomeness baxtefer's Avatar
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    yeah holes through your downtube can't help with stuctural integrity....

  5. #5
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    Quote Originally Posted by baxtefer
    yeah holes through your aluminum downtube can't help with stuctural integrity....
    I edited it so its better now...

  6. #6
    The Alternative Dressing
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    Quote Originally Posted by flythebike
    If you want a frame that won't fail catastrophically, you'd better go with ............ carbon.
    You're an idiot. More to the point, you're an idiot whose knowledge about frame materials would fit in a thimble.

    But you're probably super cool on your fixie.

  7. #7
    Wher'd u Get That Jacket? flythebike's Avatar
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    Yes, a hole in your ALUMINUM frame would definitely reduce the fatigue stregth of the frame and increase the likelyhood of such a catastrophic failure. He is lucky he wasn't injured or killed.
    WeBlog: http://flythebike.blogspot.com
    "Then know, that I have little wealth to lose. A man I am, crossed with adversity; My riches are these poor habiliments, Of which if you should here disfurnish me, You take the sum and substance that I have." Shakespeare: The Two Gentlemen of Verona
    Calfee Dragonfly Record, Calfee Luna Fixie T/A, Level, Campy Cervelo P3SL Campy, Lemond Poprad Campy, Fisher X-Calibur

  8. #8
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    i agree al. has a finite fatigue life, and in theory in can break catastophically. Empriically, my al. frame has been ridden daily for over 16 years. On road and off. Gathousands of miles annually. No failures and I have full confidence in the frame. Likewise, must of us dont sweat the 'finite fatigue life' of our handlebars, which take a beating.

    now, if i had throughbolted the downtube and the seattube, I may not have such confidence.

  9. #9
    Wher'd u Get That Jacket? flythebike's Avatar
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    Certainly a well constructed aluminum frame could last a lifetime. Or longer.
    WeBlog: http://flythebike.blogspot.com
    "Then know, that I have little wealth to lose. A man I am, crossed with adversity; My riches are these poor habiliments, Of which if you should here disfurnish me, You take the sum and substance that I have." Shakespeare: The Two Gentlemen of Verona
    Calfee Dragonfly Record, Calfee Luna Fixie T/A, Level, Campy Cervelo P3SL Campy, Lemond Poprad Campy, Fisher X-Calibur

  10. #10
    d_D
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    Quote Originally Posted by stevo
    i agree al. has a finite fatigue life, and in theory in can break catastophically. Empriically, my al. frame has been ridden daily for over 16 years. On road and off. Gathousands of miles annually. No failures and I have full confidence in the frame. Likewise, must of us dont sweat the 'finite fatigue life' of our handlebars, which take a beating.
    That is a problem with pretty much all frames not just alu.
    Steel frames can fatigue and break suddenly. Build a steel frame so it won't and it will be too heavy.

  11. #11
    Oh boy
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    but I think the point is that aluminum's progressive metal fatigure malleability is a lot less than steel. Steel (And other metals) can be bent back and forth a lot before they progressively get weak enough to snap. Aluminum has a lot less elasticity before breakage. Thats the point.

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