While at the dealership yesterday, I figured I'd start price shopping for new tires (not that I'm ready to buy right now). So, I asked the Parts guy for a price on BFG AT 285/75R16's. He asked me for the speed rating. I've never been asked that before. When I have bought tires from other places, they've never asked me for it. So, what's the speed rating on the tires for the Xterra? And does anyone have a chart of the various levels of speed ratings? I'm not familiar with them.