I have been riding the dez, as Bobzilla says, for about 16 years now without a flat. The dez here shall mean Southern Nevada and Southern Arizona. Before that I rode in the Northwest, Seattle and east of the mountains like Uller, and prior to that in and around St. Louis, MO. I like Pirelli MT-21's (I know I am in the minority here) and Michelin Ultra Heavy Duty Tubes. Takes a lot of tape weights to balance the tires but I do it. Qualifiers: I don't slam into sharp rocks and cacti at 80 mph, I don't power through whoops at 100 mph, I don't ride up or down rocky creek beds with an angle of 70 degrees, I don't run my tires down to bald, I don't intentionally do g-outs, just by accident now and then. I know riders who rode like this for some time and they are now cripples. Bad knees, bad shoulders, bad wrists, bad ankles, broken stuff everywhere. Just what you need in your old age! In other words I am now a conservative and to many of you perhaps a boring rider. At 65 I take care of my body and the bike. I still manage to have a damn good time riding the dez exploring old gold and silver mines. I run off-road pressures of 16 psi (not exceedingly low but effective). I have to go back over 16 years to a time when I had rimlocks. So this is what works for me and my riding style, i.e. my lessons learned.