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Can you fit an expander to a 9 speed set up?

Alan PAlan P Posts: 127
edited November 2014 in MTB workshop & tech
A pal of mine has a 2010 Scott Genius with a 3 x 9 speed set up (QR9 axle) with an 11/34 cassette and wants to go for a 1x9 or even better, 1x10 set up (preferably a 32 at the front). However, does anybody know if he can fit an expander ring (40T) to a 9 speed cassette, either keeping it 9 speed (so dropping a cog somewhere) or adding to make it 10 speed?

Cheers
Ibis Mojo HDR (2014)
Canyon Grand Canyon AL29 (2013)

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