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Old 09-22-22, 07:31 AM
  #19  
Paul Barnard
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Join Date: May 2007
Location: Louisissippi Coast
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Bikes: Lynskey GR300, Lynskey Backroad, Litespeed T6, Lynskey MT29, Burley Duet

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Head tube length is most often the easiest reference point. Generally, the greater the distance between the top tube and down tube intersection at the head tube, the larger the bike. With road bikes, the thing that is consistent from bike to bike is wheel size. The size of the frame relative to wheel size is also an indicator. Over time, you just develop an eye for it.
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