I have two bikes, my Madone with 650 x 23 tires and my Quick with 26 x 1.7 (not the standard Quick tires). The Madone inflation numbers are 90 to 125 psi. The Quick numbers are 40 to 65 psi. I weigh 115 (yes, I was an Athena).
First, the Quick. I went for a 16 mile ride yesterday that was primarily crushed gravel MUP, with rolling hills, a few washouts and a fair amount of loose gravel. It also included about a mile of terrible dirt road because the gravel was so large and loose. The ride went well and was pretty comfortable. My tire pressures when I checked this morning were 37 pounds, slightly less than the minimum. I pumped it up to the 40 pound minimum. Does that sound about right? It seems like more pressure would bring my bike back to its usual harsh ride and lower pressure is much more comfortable.
Next, the Madone. This bike is pretty new for me. I find it comfortable in taking the normal flaws of the road. I am keeping the tire pressure at the minimum of 90. Should I try any higher? Or does this sound about right?
My only loosely related question is about the Quick. My LBS put larger tires on it to make it suitable for the ratty dirt roads I ride on in the summer. The stock tires are 26 x 1.3. The new ones are 1.7. I have a spare tube that has no markings on it, the bike shop threw it in for free when I originally bought the bike. Do you think it will work with the larger tire? I didn't think to ask if they used the same tubes when they changed the tires out.