Originally Posted by
StanSeven
Generally 25s have less rolling resistance than 23s. But it varies by manufacturer and how they design and build the casing. So the same. General rule doesn't apply across the board. Also there's the aero benefit of narrower tires to consider. If I were you I would stick at 23s and 100 lbs
Agree...based on your light weight you should stick with what you are doing. You could probably drop it to 95PSI in front and keep 100PSI in back. The folks who should go to 25 are heavier and/or ride on really crappy roads.
p.s. extra BF credit if you are running GP4000s tires.