one time I was about 2 miles from home on my 17 mile commute & I heard the front tire start leaking air. eyeballed a cozy grassy spot next to a church to swap the tube. as I approached the grassy spot, the leaking air sound stopped. the tire was pretty soft but I wasn't riding the rim. wound up taking out the tube which had plenty of air in it. no sign of debris or tube damage. put a new tube in, rode home & trashed the old tube. God works in mysterious ways ...