Originally Posted by AndrewP
Even if you put a new tube in, you need to find the leak so you know where to look for the piece of glass or wire that caused the flat. Otherwise you will be fixing the flat in your new tube before you have gone 500 yds.
I was at a LBS last weekend and a guy asks the salesman what tire he recomendes cause he has changed his tube 3 times and it keeps going flat. Before the salesman can reply a fellow customer reaches over and pulls a goat-head out of the tire and asks, "If you changed the tube, why did you leave the thorn in?" It's hard to belive how many people forget the simple things.