i've been under the impression that the quality of the track you're riding on will also mandate what pressure you ought to ride around at. Kissena, for instance, is fairly bumpy, and while the tires i have are rated for 160, i'd really like to compare my time on a 1000m at 160 and again at 140 and see if my impression holds true.
however, this assumes that i ride consistently. ...that's not really the case
