I've had several instances where I've pulled a nail out of my tire with no leakage afterwards. Always with fairly new tires though. The one time it caused a puncture I was glad it did. The flat made me look closely at the tire, which was worn to the cords on the inside edge. That nail probably saved me from a blowout on the freeway or something. Those were also the fastest wearing tire I've owned (ContiSport 2 with around 8,000 miles on it), although I'm sure the excessive camber wasn't helping.
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