I'm switching to a shorter stem for winter, and will also be swapping bars. Since weight isn't really a concern, (although stiffness probably is) what size should I be looking at? My bike currently has a 26.0 bar/stem combo, and no flex. Is going up to 31.8 going to gain me much, if anything? And what size is most popular, used, in case I want to swap either (but not both) out again?