For frestyle that's probably good, if not higher, but for street, trials muni you probably would want to lower it providing you don't get pinch flats.
I weigh 150 and I keep my 24X2" at 30 lbs. I tried 25, but I felt the rim hitting on bumps when riding fast, not standing. No problems riding off curbs even at 25 lbs. Can't hop yet so I can't comment there.
If you are getting pinch flats a heavy duty tube makes you able to run a lower pressure a bit.
Air pressure at sea level is 15 PSI, does this mean people who are riding with 10-15 PSI in their tires have a lower pressure in their tires than the air outside?
Such a scenario would suggest that they have created a vacuum in the tire and if they take the valve cap off the inner tube will suck in air.
Unless of course they are riding at high altitude.
