Old 03-25-10 | 02:03 PM
  #2  
DaveSSS
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Joined: Sep 2008
Posts: 7,296
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From: Loveland, CO

Bikes: Cervelo Rouvida x 2

NO chance of using the IS headset with a zero-stack frame. The zero stack frame will not have the 41mm head tube ID or a 45 degree seat for the IS bearing.

http://www.parktool.com/repair/readhowto.asp?id=68
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