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I know this has been asked before but wanted to make sure in case things have changed over the years. I have a brand new Deore M592 Shadow 9 Speed rear derailleur and wanted to know if I can replace my old tourney 7 speed rear derailleur with this without having to change my freewheel and chain. I am planning on converting it completely to 9 speed eventually but not right now.

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Below 10-speed, specs have very stable and haven't changed over the years (above 10-speed, specs are also stable, but there have been some bifurcation between road and MTB, and between brands). The change has be done in one operation and cannot be done progressively.

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No, it's not compatible and it won't work..

Besides the 9 speed Deore have a narrower cage, the biggest culprit is, pull ratios are different.

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