I'm all of a sudden having a plague of flats. The day before yesterday I got a flat caused by small piece of wire that stuck through my tire. It was about the diameter of a piece of wire from a wire brush. I removed the tire, found the wire and pulled it out of the tire and replaced the tube. Now two days later I got another flat. This time I ran over a sticker in the grass (bur). It was stuck to my tire and when I pulled it off the tire pssssssssssss. What's the best way to stop getting these flats? Should I buy heavy duty tires? Tubes? Are there such a thing as tube liners?