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Cycling > Technical aspects > Impending rim f...
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Impending rim failure (spoke pull-through)??

by "Paul M. Hobson" <fobson@[EMAIL PROTECTED] > May 10, 2008 at 09:39 AM

http://www.flickr.com/photos/p_myron_h/2480606432/sizes/l/

You'll see a silver Velocity Aerohead rim.  According to the builder, 
the rim was stress relieved (JB's method) and tensioned to 100 - 110 
kgf.  On both sides of each spoke hole, the aluminum appears to be under 
significant stress by the discoloration (lighter color).

Capturing this with a photograph was tough as the lighting has to be 
just right to notice it even with the wheel in front of you.  In the 
photo, you can only see it at the left and middle holes, but this is 
happening at all 32 holes.


Is this normal?  Scary?  Immediately dangerous?  To me, it seems to 
indicate that there's a bit too much tension in the spokes.  But I'm 
definitely among the uninitiated when it comes to wheel building -- all 
of my rims up to this point have been anodized black,  which might be 
hiding this from me.

FWIW, the wheel has taken a good bit of abuse already and still quite
true.

Thanks,
\\paul
-- 
Paul M. Hobson
..:change the f to ph to reply:.




 6 Posts in Topic:
Impending rim failure (spoke pull-through)??
"Paul M. Hobson"  2008-05-10 09:39:52 
Re: Impending rim failure (spoke pull-through)??
jim beam <spamvortex@[  2008-05-10 07:29:32 
Re: Impending rim failure (spoke pull-through)??
"almost_fast@[EMAIL   2008-05-10 13:54:10 
Re: Impending rim failure (spoke pull-through)??
"Qui si parla Campag  2008-05-11 05:31:07 
Re: Impending rim failure (spoke pull-through)??
Werehatrack <rault00@[  2008-05-11 10:12:58 
Re: Impending rim failure (spoke pull-through)??
"Paul M. Hobson"  2008-05-12 09:45:02 

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tan12V112 Sat Jul 5 5:37:02 CDT 2008.