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.
Ah ok, that makes sense.
@Brommers started
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Hmmm, Shimano mtb 10 speed is dynasis though so a different pull ratio to the 9 speed derailleur no?