On the point of the wheelsize. I am mostly on my KS16X now, but I still return to my old 16S sometimes. Specifically when I know that I need to have just a little help in commuting short distance, or need to hide the wheel somewhere under the table. Totally different wheels, but both are fine to ride. Of course,if I had to pick 1, then no question - 16X is the one for all my needs, city commuting, weekend ride, fun of going off the roads...