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STi and MTB derailleur compatibility


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Good Day Guys, 


I have been running a 9 speed set of Shimano Flight Deck STi on my monster cross bike for some time. I have this paired to a SLX long cage 9 speed derailleur and 9 speed wide range cassette (11-40). This set up has been working fine. However, I do get quite a bit of chain drop especially on grassy tracks and corrugation roads ( I am running a narrow wide single front blade). 


So my question is, I have a spare clutched 10 speed XTR derailleur, would I be able to run this with the 9 speed STi, are the pull ratios compatible?



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As far as I know...no.


But 10 speed STI and 9 sp RD, yes. But you didn't ask that!


I seem to remember someone here suggesting that clutched 9 sp RD either aren't made or are as rare as the tooth of a female chicken...


Perhaps someone can confirm or otherwise?

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