Way too many flats. I average one a year, which is about one every 3500 miles. Half of those are pinch flats because I don't always check my tire pressure as often as I should, and sometimes the county throws down very rough gravel on the roads including some nearly fist-sized rocks, and I might hit one of those at night. I really can't remember the last time I had an actual puncture. I think it was about 3 years ago, a sliver of wire IIRC. It was a slow enough leak that I made it the last 2 miles home after noticing it.