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Discussion Starter · #1 ·
Sounds silly, but I'd like to go from a 12/25 9 speed cassette to a 12/27. Do I have to worry about a 7700 series rear derailleur being able to give me that last gear, or will I have that terrible "rudda rudda" noise coming from the top pulley. Am I not mistaken in thinking there is a different rear derailleur that can accommodate that 27 cog?

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