Thread: Ultegra 6503 Triple to Double
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Old 06-26-12 | 04:09 PM
  #5  
Al1943
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Joined: Feb 2005
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From: Oklahoma

Bikes: Trek 5500, Colnago C-50

The middle ring of a 6503 is a 42, significantly higher than the more common 39 used as the middle ring on most Shimano triples or the inner ring on most standard doubles.
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