You are reading a single comment by @edscoble and its replies.
Click here to read the full conversation.
-
it's just Shimano trying to get you to buy a new mech if you do swap.
The fact the chainring is 2.5mm outboard mean a new derailleur is necessary if the existing one doesn't work that well, especially since the front derailleur will pivot far more extreme than it usually do on a normal chainset thus losing a bit of mechanical advantage.
edscoble
Dogs
I'm going to assume that on most frames that isn't going to be an issue, it's just Shimano trying to get you to buy a new mech if you do swap. The the action of the front mech is pretty coarse compared to the rear, and can operate perfectly with less accuracy.