I had my first flat tire on my teggy yesterday! It was actually caused by a piece of glass, which usually doesnt puncture tires, but I guess it just worked its way through until it punctured. I took it to my friends shop and they couldn't patch it either, it was too close to the wall, so I had to buy an econo-tire to get me by until I get my whole new wheels/tires setup... Flats are no fun!