Originally Posted by
Leisesturm
About the only thing I'll add is that after flat number #1 it is often the case that whatever caused it is not properly removed. It can really be frustrating! You need to get a very bright light AND run your fingers over the entire inside and outside of the tire and make sure no wires or small (really tiny) pieces of glass are not still embedded.
^^^This.^^^
I can't tell you how many club rides I've been on where someone got a flat, they did nothing more than a quick finger sweep while not even removing the tire and when they found nothing assumed a pinch flat. So they installed a new tube and a couple miles down the road, another flat. You really need to remove the tire, turn it inside out and both look and feel carefully for any objects. I rarely get flats - usually about once a year or less. When I do, I usually find a small strand of wire.