First, what is the EU size of your normal size 14s? Best to take an average of the EU size, NOT US size, of 2-3 pairs of your normal casual, athletic, or hiking (NOT moto) footwear.
Sizing is slightly generous, and definitely wide. Additionally, I am a little conservative with the conversion, Forma Italy says a 49 is a 14.5 (it is not, they are incorrect). Unless you are closer to a size 50 / 15, the 14s should work. FWIW they are one of the larger boot fits I have seen.
These will be my first pair of true MC boots. Don't have any personal EU sized footwear (moto or non) to compare with. Looking at these and the Gaerne Balance Oiled (which is also available in EU49 - at a premium price I might add). My true US shoe size is 14.5 (on occasion I've gotten 15's). Of the two, which is more likely to be a better fit. Understand both to be wide that is good for me.