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Old 10-21-13, 01:59 PM
  #10  
techsensei
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I believe the only material difference between the Tiagra and 105 front derailleurs is the inner link of the parallelogram; it is stamped steel on the Tiagra, and cast aluminum on the 105. The cast links on the 105 should...at least in theory...make it stronger/stiffer.
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