Originally Posted by
BarracksSi
Does your 16" Trek have the same reach from the saddle to the bars, though? Get a measuring tape and find out. I recently checked the reach of all of my bikes just for kicks, and was surprised to find that they were all virtually identical.
Interesting note is that according to Trek's geometry of the FX bikes, there is only about .2" difference (shorter) between the 17.5" FX and the 15" frame FX.
EDIT: That was for the 7.3 FX. For the 7.2 FX which is what the OP has, the 15" is .4" shorter - that might help a lot. Easier to swap stems though, maybe?