Thread: Shimano Compatibility question! Please help!
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Old 06-02-18 | 07:48 AM
  #10  
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Kimmo
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Bikes: https://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=152015&p=1404231

The 8s RD will work on 7s if you have 7s shifters.

If you have 8s shifters, you should probably run 7/8ths of a cassette.
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