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Old 03-11-18, 08:44 AM
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I know you won’t be able to use 12t pulleys on 7800 and 7900 derailleurs. Not enough room for the larger wheel and chain to fit and clear the tabs on the der cage.

Not sure about the 9000.

Last edited by Davet; 03-11-18 at 08:48 AM.
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