I was just wondering what pressure any of you autoxers ran in your rear tires. I know the fronts have to be heavily inflated or else they will roll, but what about the rears? I just got back from an scca auto x in san francisco, where I ran 40psi in my rear and it just felt like my tires were coming loose far too easily. I want to run a lower pressure, but I am afraid they will roll. Any advice would be helpful. Thank you.