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Rear derailleur

  • By Caley Fretz
  • Published Apr. 17, 2012
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The bigger motors on Ultregra Di2 lend to a bulkier, more bulbous look. Photo: Caley Fretz

The bigger motors on Ultregra Di2 lend to a bulkier, more bulbous look. Photo: Caley Fretz

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