What kind of pressures are you guys running for urban street riding/trials/skatepark stuff? I just got some street tires (Specialized Nimbus EX) . I wanted the Hookworms but they were more than 3 times the price at the lbs. They are 1.5 inches wide and I've been running about 50 psi in them. I'm starting to get more into street/urban stuff and I've been riding the skatepark a bit as well so I'm worried if I run a lower pressure I'll pop the tube. They feel really hard though over all the bumps though...do I just have to endure the bumps or can I lower the pressures?