190 lb rider, 27 lbs bike + gear, 700x38 Compass Barlow Pass extralight tires, on H+Son Todestrieb rims (about 26mm internal width). For most riding, I run 42 psi rear, 34 psi front. I definitely shoot for the 15% tire drop. On narrower rims (19 mm internal width), these same tires needed to be 5+ psi higher to be stable in hard turns.
On another bike running 700x32 Panaracer Paselas on 18mm internal width rims, pressure is 65 psi rear and 55 psi front.
Last edited by ajp; 10-03-16 at 07:35 PM.
Reason: Added detail