Ralph, I got just over 9,000 miles out of my first set of PR2s -- the set I had at CFR last year. This weekend I'm changing out my second set (takeoffs at about 3,200 miles (from just before the CFR trip set) that I put on again after that CFR set wore out). Not sure as I sit here, but I think I'm going to have about 7,000 on this set (though the front may have another 1,000 left in it). No idea why the difference in tire life for identical tires out of the same batches. Too much two up? Too much right hand? Different road surfaces? More heat cycles in this set than for the CFR set that had almost 5,000 miles of its 9,000 mile life put on during two weeks of touring?