Old 07-12-19, 07:03 PM
  #6  
Eggman84
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Bikes: 2014 Bruce Gordon Rock&Road, 1995 Santana Visa Tandem, 1990 Trek 520, 2012 Surly LHT

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You probably can use a Shimano FD-CX70 FD. It is rated for 16 tooth difference but but your proposed 42-24 is only 18 tooth.
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