Thread: Shimano SIS 9 speed compatibility
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Old 08-15-22, 02:51 PM
  #12  
alcjphil
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You have a set of 7900 downtube shifters. You have a 10 speed compatible rear derailleur. Ditch the 9 speed cassette. Buy a 10 speed chain(which you will need anyway even with 9 speed) and cassette. Assemble. All will be good
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