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Amazon.com : SHIMANO Dura-Ace 7800, Ultegra CS-6600, 10-Speed Cog Spacer (2.35mm) : Bike Cassettes And Freewheels : Sports & Outdoors
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Amazon.com : AEcreative 10pcs Bike Bicycle 7 8 9 10 11 Speed Cassette freehub Spacer 1mm 1.5mm 2mm 2.5mm 3mm Bottom Bracket Washer BB : Sports & Outdoors
![Replacing friend's cassette. Found spacer. Is a 10 speed cassette. Don't know if it is 11 speed hub. Do I keep or throw? : r/bikewrench Replacing friend's cassette. Found spacer. Is a 10 speed cassette. Don't know if it is 11 speed hub. Do I keep or throw? : r/bikewrench](https://i.redd.it/9sj3p1q1iex71.jpg)
Replacing friend's cassette. Found spacer. Is a 10 speed cassette. Don't know if it is 11 speed hub. Do I keep or throw? : r/bikewrench
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