• A 10 speed Shimano shifter (other than Tiagra R4700) works perfectly with a 9 speed MTB rear derailleur and a 10 speed cassette.

    Hmmm, Shimano mtb 10 speed is dynasis though so a different pull ratio to the 9 speed derailleur no?

  • Yes, sorry, should have clarified - that's a 10 speed road shifter with a 9 speed derailleur.

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