Switched this summer to 32 at 80 psi from 25's at 100 psi. Barely noticed a
difference in speed or effort on a 24 mile roundtrip commute with 20 or so lights.
But the difference in ride is nite and day. Next time I will probably go to 35's.
Bike is between 40 and 45lbs.fully loaded and I'm 175.