OK, so maybe the thread title is a little dramatic. Just amusing myself mid-week.
My friend and I went on a ride this morning, and on the way back his back tire lost all of its air. We both heard it -- snap, hiss... flat. (Almost that quickly, too)
Of course the first thought was a nail or other debris, but examination revealed that the side of the valve stem (Schrader) was cut. My first guess is that the stem was rubbing against the hole in the rim, but we did ride for several miles before that. Maybe it just took that long to rub through.
Does this sound plausible? I didn't have time to do a thorough examination of the rim itself, since we were already running late. But I'm just wondering if it's common.
We've been riding almost every week, so I'm kind of surprised it didn't happen sooner if this is actually the cause. My friend hasn't done anything like removing the tire or tube from the bike, but he did pump up the tire with a small hand pump before the ride this morning (so perhaps he wasn't careful enough and cut the stem against the edge of the hole in the rim).
If my friend was the one to cut the stem accidentally, would there be any prevention to this thing aside from just thwapping him upside the head and telling him to be more careful? Maybe convincing him to switch to Presta?
Also, aside from carrying a spare tube (which I'm seriously considering anyway), is there any way to repair this long enough to get home?