STi and MTB derailleur compatibility

[philbg]

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?

 

Thanks.  

[Fat Boab]

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?

[Emile]

It will not work. Maybe a Chain Tamer would help?

 

...

 

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?

 

Thanks.  

[philbg]

Thanks for the replies, I suspected as much. 

 

That Chain Tamer looks good for this purpose. 

[Emile]

I hope it helps.

 

Thanks for the replies, I suspected as much. 

 

That Chain Tamer looks good for this purpose. 

[Grease_Monkey]

This should sort you out...

 

https://www.wolftoothcomponents.com/products/tanpan