Originally Posted by
Squeezebox
My 35 mm tires have stiff sidewalls. They are around 80 or 90 PSI for around town use, that feels good for now. When I go to do the Katy I wonder if I'll lower the pressure in these or go to the 29x2.0 the bicycle came with. I'm thinking it depends on if the trail is wet or dry.
What does "feels good" mean to you? Unless you weigh 300 pounds, this is too high. You will be much more comfortable with lower pressures. For Cyclocross racing, I run 33mm clinchers at about 25psi front, 28psi rear and have only pinch flatted once in four full seasons. Go way lower for off road unless you ride like a brick and never unweight for bumps.