Originally Posted by
cyccommute
It really shouldn’t be an issue. You are really only asking the derailer to move the chain on a slightly larger chainring. There are lots of comfort bikes out there using MTB derailers on 48 tooth chainrings.
I am shifting a 42/32/22 crankset with an Alivio FD-M410, and it worked fine when had I put on a 46 tooth chainring; I removed it only because I preferred the lower gearing.