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Old 05-25-13 | 07:19 PM
  #78  
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Mobile 155
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Joined: Sep 2011
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From: Dallas Fort Worth Metroplex

Bikes: 2013 Haro FL Comp 29er MTB.

I wonder how much we are guessing? http://www.health.harvard.edu/newswe...activities.htm There do seem to be people that actually measure these things.
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