• That doesn't have friction mode, which IMHO a very important choice, especially if your derailleur hanger is bent a bit and the gear go out of sync.

    (To answer your question, they work, but not with 10spd MTB derailleur, 9 speed MTB one is recommended).

  • Still work.

    8/9/10 have same cable pull*, I ran an 8 speed derailleur once because my 10 speed one broke.

    *new MTB 10spd have different pull, new Tiagra 4700 too).

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