Kenda Parker DT tires are really stiff, even with the heavy bike and my 280# on it, 6 psi provides a nice contact patch and gobs of traction. So far it's been the best compromise in the sand and rocks in the desert. I don't ride terribly fast, lots of loose rocky single track stuff at 10-20mph. Front end feel good to me, even higher speed sliding the rear around turns. I landed on 6ish PSI by trial and error, running less didn't provide any perceived benefit. I'll often run 10psi if I'm likely to end up on any pavement or long stretches of 50+ MPH dirt roads.