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Old 06-20-21, 06:32 PM
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Alcanbrad's Avatar
Join Date: Apr 2015
Location: New Jersey
Posts: 407

Bikes: '14 CoMo Carrera, '11 CoMo Primera co-pilot, '98 Santana Visa, a Plethora of road bikes, A commuter/Gravel beast (and 1 MTB)

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From the interwebs:

Shimano Cassette Spacers
  • For use on 11-Speed freehub body with 9 or 10-Speed cassette
  • Using 10-Speed cassette on 11-Speed freehub body requires both 1.85mm (FW8991) and 1.0mm (FW4671) spacer
  • Using 9-Speed cassette on 11-Speed freehub body only requires 1.85mm (FW8991) spacer
I believe most 10 speed cassettes come with a 1mm spacer. I don't know if this is still the case, I have many of these in my bits and bobs bin that I don't really pay attention to whether I get another one or not.
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