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PostPosted: Sat May 28, 2011 1:13 am 
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Joined: Sun Oct 31, 2010 10:54 pm
Posts: 454
Location: London
Hey all, Im pretty sure the answer is here! This is my first zipp wheelset so i am new to the brand, theres a sound coming from the rear hub, very difficult to explain so i put it on youtube. Its the whistling sound in the background and can't be heard while riding. I know the video shows it being spun fast but it also happens when its much slower.

Thanks for the help!!

http://www.youtube.com/watch?v=m0lzoM0aYY0


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PostPosted: Sat May 28, 2011 1:44 am 
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Joined: Fri Mar 18, 2005 4:12 pm
Posts: 2503
Location: eh?
Sounds like harmonic resonance likely related to specific spoke tension and alignment. Of course when you are on the bike the wheel is loaded and the acoustic properties are altered. There is nothing wrong with your wheel (other than it is not a tubular).

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PostPosted: Sat May 28, 2011 3:23 am 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1980
Location: NoVA/DC
i believe ive heard it with every 188 rear hub since they came out. dont know the exact cause, but ive never heard it while riding. my guess would be spoke harmonics caused by the frequency of the pawls/ratchet. as mr.gib said, loading the wheel would alter the frequency of the spokes.
it's normal.


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PostPosted: Sat May 28, 2011 4:27 am 
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Formerly known as PezTech
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Joined: Tue Sep 26, 2006 12:37 am
Posts: 5746
Location: Phoenix Arizona
normal

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PostPosted: Sat May 28, 2011 7:09 am 
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Joined: Tue Dec 07, 2010 7:33 am
Posts: 174
Location: Canada
Sounds like a wheel spinning to me. Nothing unusual.

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PostPosted: Sat May 28, 2011 11:47 am 
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Joined: Sun Oct 31, 2010 10:54 pm
Posts: 454
Location: London
thanks a lot fellas, i'll sleep better now!

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PostPosted: Sat Sep 03, 2011 2:27 pm 
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Joined: Fri Aug 26, 2011 9:49 am
Posts: 12
my 202s make the same sound. the first time i heard it i thought it was my cellphone...


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