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Can I install a 10 speed cassette on a 9 speed hub?

April 26, 2017cassette Hub install speed

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Can I install a 10 speed cassette on a 9 speed hub?

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In most cases you can use a 10 speed cassette on a 9 speed hub except in the following combinations: – CS-7800/6600 gear combinations 11/21, 11/23, 12/21, 12/23 cannot be used on WH-6500 and WH- 7700 wheels. – CS-7800 gear combination 11/21 cannot be used on WH-R540 wheels. – WH-R535 wheels cannot accept any CS-7800/6600 NOTE: When installing the CS-7800/6600 on a 9 speed freehub, you must use the supplied 1mm spacer (part# Y1Z807000) behind the cassette. To space the gear properly in the frame.