Weird stuff...
the same thing happened to me yesterday!

I finally had a nice ride on my new Sequoia Expert. Between foul weather and a 5 month old, it was difficult to get out and ride.

For father's day we got a chance to walk on the boardwalk. I rode for 12 miles. On the walk home, maybe 45 minutes after I stopped riding, we hear a loud rush of air. We hone in on the stem of the front tire just as the 100 psi was now down to about 0 psi.

Very odd I thought, since riding on the boardwalk put a bit of shake into the bike and would expect that such a problem would happen while riding, not nearly an hour later.

I filled the tubes to 100 psi before I left the house...walked with my wife and baby to the boardwalk...rode a bit and then walked home.

I figure that if the tube was stressed, it would have blown a tube while riding. Walking it home, I did not roll over any sharp objects. I was walking the bike, so no real pressure was against the tire.

When I inflated the tires before my ride, I noticed that the knurled nuts that keep the stem seated onto the rim were loose. I tightened them, but not very tight. I can only wonder if I should have left them loose, or was this just a coincidence. (I never left them loose on my previous bike).

When I got home, I tried to inflate the tube again...didn't seem to take more than 20 psi while pumping.

Bad stem?
Any ideas?

Father's Day = First real ride
Father's Day = First real repair!