fwiw, for all 3 of my bikes:
- trial & error to get what I like
- I never go over the max on the sidewall
- the front always has less than the rear, maybe 5 or 10psi
- Wifey like hers softer, in general, plus she doesn't weight much
- the lowest I've gone is with my MTB on sandy trails, 21psi front 25psi rear. mostly it's more like 25psi front 35psi rear (for trails, not pavement)
just put the summer tires on. this is what 21-5ish psi looks like on a WTB 700x2.25" tire w/o rider weight
