3

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.

4 Answers 4

2

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.

3

The rear shift ratio (pull ratio) of Shimano 7,8 and 9 speed derailleur is same 1.7:1

So the specs say it should work.

Please update us with how it works in practice.

1
  • Hi, welcome to bicycles. This seems more like a comment on one of the other posts than a complete answer on its own. Please only post full answers; you might want to take the tour.
    – DavidW
    Aug 20, 2023 at 19:44
2

My Kona from the factory came with a 9 speed Alivio rear derailleur and 8 speed shifter and cassette, so that indicates that you should be compatible.

-2

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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