Originally Posted by
bobwysiwyg
I've seen the term "snake bite" punctures. What causes them? I've only had one flat, a nail, through and through from one sidewall to the other. Looked like a nail from a nail gun.
Running too low of pressure, a harsh bump causes the tire to collapse, and somehow the pressure through the rim, the tire, both walls of the tube, and the tire again, is still enough to cause a small double-hole in the tube. I suppose it would vary on tire size, but for road tires, it makes a distinctive pair of holes about 3/8" apart, with no obvious hole in the tire or bad spot in the rim.
A rider probably remembers hitting something.