Old 09-23-10, 03:35 PM
  #3  
Al1943
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Join Date: Feb 2005
Location: Oklahoma
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Bikes: Trek 5500, Colnago C-50

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It's designed to give you the correct chainline for a double crankset, 43.5 mm. The design of the crankset should put the pedals equal-distant from the bike's centerline.
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