Originally Posted by
unterhausen
this may happen with car tires, but I don't think it's likely with most bike tires. And furthermore, if you catch a nail, you'll hear it smacking the ground, and probably the frame.
Depends on the size of the nail. It's happened to me with small nail (about 1" long not much of a head). I didn't notice any problem until I got my bike the next morning. The head was flush with the rubber.
Same thing with a carpenters staple. The head broke off. I noticed the tire needed air every morning but not too much. So on the weekend I checked. The two staple ends were sticking thru the tire and tube. You couldn't even see where it was from the outside.