Will my Shimano Deore front derailleur M6025 2x10 work with Shimano Alivio 3x crankset?
I'm confused because my front derailleur is not 3x design.
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Yes, it will work, but not optimally.
According to the bible:
"Double" front derailers will work with triples, but if the middle ring is much smaller than the big ring, they will be balky shifting up from the small to the middle chainring.
I used to have a very cheap bike with a double front derailleur and triple crankset. The diminished front shifting performance was not noticeable because all of the components were so poor that every shift was poor anyway, even in the rear!
If you have a 3x shifter the 2x derailleur might work, but very likely not as well as a proper 3x one. The cage is likely not deep enough to reach between the largest and smallest rings.
You imply that the derailleur is installed on the bike, how did it get there? Is this a used bike you bought or did you have the derailleur replaced?
If you have an Alivio groupset - presumably a 3x8 setup - you can obviously switch the derailleur for a proper 3x one that is compatible with your shifter and crank.