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My buddy has a 9 spd cassette, 11-34, medium cage der, and is wanting to add an expander ring. Is it possible to add a 40t e.therteen, one up, hope t-rex or the like?
 

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The joy of ski is Yours
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Short answer - Yes. Long answer - No.

These are marketed as 10-speed cassette items, so the spacer will be too-shallow. I don't see why some fractional BB washers shouldn't be able to patch that up.
 
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