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Is my Fissure dangerous??

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Is my Fissure dangerous??

Old 05-06-17, 10:26 AM
  #26  
Wallstreet
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Originally Posted by Bike Life View Post
Don't know if this was mentioned but I thought most FRAMES had a life time warranty
Bianchi don't. 5 years on aluminium.
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Old 05-06-17, 10:30 AM
  #27  
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Originally Posted by WizardOfBoz View Post
I read this after my long post. Your approach is good, but as an engineer I would humbly suggest that a machinist might be of more help/

You don't want to "lay" a collar with high-temperature forming: you want to machine one and shrink fit it. This is because to form something, you'd first have to machine the forming dies anyway. Male AND female. Machining the collar directly cuts the machining in half, and eliminates the forming step.

You could use aluminum, but you'd want the collar at least as thick as the original flange. I think steel would be less bulky and about the same weight (maybe less).

Many approaches shown in the Australian link you posted involved welding. You can weld your frame, but you'd then have to post-weld heat treat the whole frame which would require a new paint job. And that Bianchi pale green is sweet.

Whatever you do, if that crack has propagated to the head tube, get someone who knows what they're doing drill a hole to eliminate the stress concentrator (that is, the end of of the crack).

Good luck!
Wow what a brilliant reply, he has access to a leith. You make precise points & provide amazing ideas. I will show my friend this thread. He's one of my best friends & I respect his ideas. You really give great detail. Any photos of your bike before & after?
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Old 05-07-17, 05:52 PM
  #28  
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If going steel, stainless would be the go no need to paint, but use a retaining compound to try and isolate the SS from the aluminium. A slightly thicker aluminium collar might cause less electrolysis.
Ream and face the headtube afterwards. Looking at where the crack is, it could be caused by the interference between the headset and tube being too small, it stretched the head tube causing a stress crack.
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Old 05-07-17, 06:11 PM
  #29  
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Originally Posted by Bike Life View Post
Don't know if this was mentioned but I thought most FRAMES had a life time warranty
One would think for the price of these bikes that would be the case...I hate to be this way but even the cheap box store bikes have and do implement a lifetime warranty or at least 10 years on the frame.

I would take it back to where it was purchased and go from there. Its a very nice bike. to cob job the thing wouldnt be just imo...
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Old 05-07-17, 07:43 PM
  #30  
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I wouldn't chance it!
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Old 05-08-17, 10:16 AM
  #31  
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Originally Posted by Trevtassie View Post
If going steel, stainless would be the go no need to paint, but use a retaining compound to try and isolate the SS from the aluminium. A slightly thicker aluminium collar might cause less electrolysis.
Ream and face the headtube afterwards. Looking at where the crack is, it could be caused by the interference between the headset and tube being too small, it stretched the head tube causing a stress crack.
Strange indeed on how.
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Old 05-15-17, 03:39 AM
  #32  
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Originally Posted by TheLastOfUs View Post
I wouldn't chance it!
Many actually do fix it successfully. There are a lot of U.K. Or USA ships that rectify these problems.
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