Had my first 700x38 Nimbus Armadillo flat (in 1300 miles) Sunday. It was a heavy galvanized roofing staple that had been bent in a way that left one sharp point going straight up. It hit one of the grooves in the tire. My last three flats have all been on the Old Redwood Highway somewhere between Petaluma and Healdsburg. Pity that route is the flattest, straightest route when I have to get certain places.