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Hi chaps,
Replacing part of my drivetrain, 10sp double cranks on my 9sp setup. I know that's all fine, but if I switch to a 10sp double front mech will the front triple shifter still pull the right amount? Or do I need a triple mech and just adjust the screws?
Cheers
Ricks
I think you just need the correct derailleur for your cranks and rings (as you probably know the cage and hinges for the triple 22-32-44, 24-32-42 and double are different shapes to track the corresponding rings better).
Don't think there is any pull ratio difference between the 9 and 10 speed front shifters and you just need to decide if you want to use 1 and 2 or 2 and 3.
I'm not sure of the advantage of using a double-specific derailleur. I've certainly had no trouble running a triple (Shimano mech) with a double and bash setup by simply adjusting the limit screws. I guess if you're running a big gap between your two front rings (E.g. 22 and 40) then a differently-shaped cage might help a bit.
There's no problem mixing/matching 9 speed shifter with 10 speed derailleur though. Doesn't matter what the cranks are.
It will work. It just won't work as nicely.
What about a 9 speed double specific front mech (SLX) with SLX 10 speed shifters?
I've been using a 10 speed XT mech with 9 speed XTR shifters and 9 speed XT cranks, double and bash, 22/34. Works flawlessly - in fact it works better than the old 9 speed derailleur I had on before.
It's up to you whether that information is useful.
@cruzheckler
from memory the 665 style 9 speed SLX double FDs worked fine with XT and SLX 9 speed shifters so you should be fine if 10 speed front shifters work with 9 speed FDs. YGM re RD btw.