Originally Posted by rjberner
Am struggling to keep my Ultegra front derailleur aligned and adjusted. Always liked the old XTR front on my off-road and wondered if it can be used on a 53 tooth cog on a roadie. The lit says no, but has anyone done it anyway?
Two problems:
1) The current XTR F/D is designed for a max big ring of 44-46 teeth, so the radius of the cage will not be optimum.
2) The more important issue is that a mountain F/D has a different actuation ratio than a road F/D. IOW, the cage will move a different amount per length of cable pull. This is not a big issue with friction shifting, but with index front shifting it is the kiss od death
