Have you ever see one fail like this?
#76
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Was thinking of buying a used Bianchi with carbon fork and stays. Didn’t really need it, I ride by surly crosscheck most of the time. This thread is decide I’m not interested in an older carbon bike. Just doesn’t seem worth the risk
#77
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Or Occam's rotor. Clearly what happened is an airborne severed leg from one of the other rider's unfortunate amputation from a disk break [sic] flew into the wheel.
This is by far the simplest and most parsimonious hypothesis that explains all of the facts.
This is by far the simplest and most parsimonious hypothesis that explains all of the facts.
#78
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#80
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A broken SPD-sole shoe once caused my foot to come down into the front wheel spokes on the right side of the wheel, the rotating wheel then jacked my foot upward, throwing me off of the bike onto my left side.
Oddly enough, I was able to continue the ride, apparently since I lost most of my speed as the wheel was jacking my leg upward.
Not a single spoke broke or pulled out.
This wheel, with eight spokes ripped from the rim, appears to indicate severe overload occurred. But if one fork leg failed first and the wheel then twisted sideways, then it seems to me the wheel failure would be entirely asymmetric left-to-right, with spokes on one side failing but not on the other side. Odd here that the spokes aren't bent, seems they would be bent if the wheel ingested a solid object.
I am wondering how heavily that the bike was loaded, and possibly how a further impact load might have been generated.
Possibly an outer-ply failure of the tire, leading to an abrupt bulge, might have suddenly stopped the wheel from turning(?)
Oddly enough, I was able to continue the ride, apparently since I lost most of my speed as the wheel was jacking my leg upward.
Not a single spoke broke or pulled out.
This wheel, with eight spokes ripped from the rim, appears to indicate severe overload occurred. But if one fork leg failed first and the wheel then twisted sideways, then it seems to me the wheel failure would be entirely asymmetric left-to-right, with spokes on one side failing but not on the other side. Odd here that the spokes aren't bent, seems they would be bent if the wheel ingested a solid object.
I am wondering how heavily that the bike was loaded, and possibly how a further impact load might have been generated.
Possibly an outer-ply failure of the tire, leading to an abrupt bulge, might have suddenly stopped the wheel from turning(?)
Last edited by dddd; 06-11-19 at 06:46 PM.
#82
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**** happens.
__________________
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Two wheels good. Four wheels bad.
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Two wheels good. Four wheels bad.
#83
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So an aluminum fork breaking has convinced you to not buy a crabon bike? Makes sense.
#84
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What in the absolute hell. There's been several posts like this, that is NOT a carbon fork.
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#86
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The aluminum fork failure was a reminder that carbon parts have a high failure rate? The aluminum fork failure reminded me to take the trash out later.
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#87
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Not Heavy
A broken SPD-sole shoe once caused my foot to come down into the front wheel spokes on the right side of the wheel, the rotating wheel then jacked my foot upward, throwing me off of the bike onto my left side.
Oddly enough, I was able to continue the ride, apparently since I lost most of my speed as the wheel was jacking my leg upward.
Not a single spoke broke or pulled out.
This wheel, with eight spokes ripped from the rim, appears to indicate severe overload occurred. But if one fork leg failed first and the wheel then twisted sideways, then it seems to me the wheel failure would be entirely asymmetric left-to-right, with spokes on one side failing but not on the other side. Odd here that the spokes aren't bent, seems they would be bent if the wheel ingested a solid object.
I am wondering how heavily that the bike was loaded, and possibly how a further impact load might have been generated.
Possibly an outer-ply failure of the tire, leading to an abrupt bulge, might have suddenly stopped the wheel from turning(?)
Oddly enough, I was able to continue the ride, apparently since I lost most of my speed as the wheel was jacking my leg upward.
Not a single spoke broke or pulled out.
This wheel, with eight spokes ripped from the rim, appears to indicate severe overload occurred. But if one fork leg failed first and the wheel then twisted sideways, then it seems to me the wheel failure would be entirely asymmetric left-to-right, with spokes on one side failing but not on the other side. Odd here that the spokes aren't bent, seems they would be bent if the wheel ingested a solid object.
I am wondering how heavily that the bike was loaded, and possibly how a further impact load might have been generated.
Possibly an outer-ply failure of the tire, leading to an abrupt bulge, might have suddenly stopped the wheel from turning(?)
#88
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#89
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Just look up cracked/broken carbon frame and yes, there are many like this actually with the forks looking just like that. Just because they slapped a Trek logo on there doesn't mean it won't fail, it just means you paid more for something made in china. That goes with every manufacture, specialized, canyon, you name it, it's Chinese carbon all around.
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#91
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#92
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Just look up cracked/broken carbon frame and yes, there are many like this actually with the forks looking just like that. Just because they slapped a Trek logo on there doesn't mean it won't fail, it just means you paid more for something made in china. That goes with every manufacture, specialized, canyon, you name it, it's Chinese carbon all around.
#93
Senior Member
A broken SPD-sole shoe once caused my foot to come down into the front wheel spokes on the right side of the wheel, the rotating wheel then jacked my foot upward, throwing me off of the bike onto my left side.
Oddly enough, I was able to continue the ride, apparently since I lost most of my speed as the wheel was jacking my leg upward.
Not a single spoke broke or pulled out.
This wheel, with eight spokes ripped from the rim, appears to indicate severe overload occurred. But if one fork leg failed first and the wheel then twisted sideways, then it seems to me the wheel failure would be entirely asymmetric left-to-right, with spokes on one side failing but not on the other side. Odd here that the spokes aren't bent, seems they would be bent if the wheel ingested a solid object.
I am wondering how heavily that the bike was loaded, and possibly how a further impact load might have been generated.
Possibly an outer-ply failure of the tire, leading to an abrupt bulge, might have suddenly stopped the wheel from turning(?)
Oddly enough, I was able to continue the ride, apparently since I lost most of my speed as the wheel was jacking my leg upward.
Not a single spoke broke or pulled out.
This wheel, with eight spokes ripped from the rim, appears to indicate severe overload occurred. But if one fork leg failed first and the wheel then twisted sideways, then it seems to me the wheel failure would be entirely asymmetric left-to-right, with spokes on one side failing but not on the other side. Odd here that the spokes aren't bent, seems they would be bent if the wheel ingested a solid object.
I am wondering how heavily that the bike was loaded, and possibly how a further impact load might have been generated.
Possibly an outer-ply failure of the tire, leading to an abrupt bulge, might have suddenly stopped the wheel from turning(?)
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#94
Senior Member
that could have been caused by pretty much anything. considering its crabon. look up luescher teknik on youtube https://www.youtube.com/channel/UCY9...4lLOHpb_zbIedQ and you will see how subpar most carbon frames are. and its pretty much a gamble what you will get. He said in his latest vid that he had tested 80 forks this years and only 8 were constructed correctly and showed no signs of internal crappieness. thats 10%! you do the math here.
its just the same with the frames i'm afraid.
so that damage may have happened because of something external and it may also have happened because of shoddy internal contruction/design with voids/adhesive pooling/porosity/fabric wrinkles and similar. I think most of carbon frame fails are due to internal failures caused by shoddy workmanship. wrinkling/voids etc. it just takes more or less time to develop.
its just the same with the frames i'm afraid.
so that damage may have happened because of something external and it may also have happened because of shoddy internal contruction/design with voids/adhesive pooling/porosity/fabric wrinkles and similar. I think most of carbon frame fails are due to internal failures caused by shoddy workmanship. wrinkling/voids etc. it just takes more or less time to develop.
#95
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In terms of a frontal impact, I have a hard time imaging how that would shear the fork, shear a bunch of spokes at the nipples and still leave the wheel pretty dang round.
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#96
Senior Member
the fork would at the very least be bent the other way for a frontal impact to have happened. with bent metal in that direction to go with it. but now its the exact opposite. looks like a typical stray squirrel JRA accident to me at least. very very certain of that. feel free to prove me wrong. i'm all ears.
so no this is n0ot warranty. this is accident. maybe its insurance. good luck getting the manufacturerar paying for this. not gonna happen. i can tell you that. only thing missing is the squirrel in the wheel pretty much. and is that a manufacturing defect?
so no this is n0ot warranty. this is accident. maybe its insurance. good luck getting the manufacturerar paying for this. not gonna happen. i can tell you that. only thing missing is the squirrel in the wheel pretty much. and is that a manufacturing defect?
#97
Senior Member
At least one of the spokes looks bent. Regardless, if something get stuck in the spokes, the spinning wheel is going to move it outwards, towards the nipples (unless the object is large or gets wedged in a spoke crossing).
In terms of a frontal impact, I have a hard time imaging how that would shear the fork, shear a bunch of spokes at the nipples and still leave the wheel pretty dang round.
In terms of a frontal impact, I have a hard time imaging how that would shear the fork, shear a bunch of spokes at the nipples and still leave the wheel pretty dang round.
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Why is the fork and its material and failure even being discussed?
It is obviously the the symptom of the incident not the cause.
Whatever jammed in that wheel would of put the rider over the bars regardless of the fork material.
I have a friend who broke his back (fortunately healed ok) when a tyre iron got flicked off the road by another rider and went through his front wheel.
His fork was also smashed but that is irrelevant to the outcome.
It is obviously the the symptom of the incident not the cause.
Whatever jammed in that wheel would of put the rider over the bars regardless of the fork material.
I have a friend who broke his back (fortunately healed ok) when a tyre iron got flicked off the road by another rider and went through his front wheel.
His fork was also smashed but that is irrelevant to the outcome.
#99
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Gotta be 40 years ago, a good local bike shop told me that the (new at that time) deep section aluminum rims (I think Weinmann) were so rigid, a frontal impact would bend the (steel) fork before bending the rim. And that was at 27"/700c diameter. Go smaller diameter and the rim gets even stronger. For a time I had one of the original Dahon folders with about 16"(?) chromed steel rims, your teeth fillings would loosen before ever bending those rims.
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The OP is either trolling or, because of his emotional ties to the unfortunate rider, he's holding on to some illogical hope that it really was a JRA failure so that he can blame someone, anyone.