how do you guys do it? thin tires + road bike (no suspension). all the bumps and cracks and the occasional pothole in the ground. surely you guys can't maneuver around everyone of them. so how do you put up with it? even if you get off the seat slightly for every bump, you ass will be free but the frame will still take the vibrations and you will feel part of it. would a mountain bike with some sort of suspension and slick tires be a better commuting bike instead of a road bike (which was designed to ride on smooth ground). or do you guys all commute on bike trails with road bikes so it is not a problem? or does your butt you enjoy the bumps?