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Old 09-14-11 | 08:40 AM
  #4  
homebrewk
yoked
 
Joined: Jan 2011
Posts: 3,594
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From: S
It may be because they want to have the bike in a more aggressive position (smaller wheel = frame sloped more forward)

See here: (this guy has a 700c rear w/a 650 front)

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