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Summary: Got a flat bike tire? Learn how to check a bicycle tire tube for punctures by adding air in the tube to see where the leak is, in this free bicycle repair video.
Parker Ramspott has owned and operated a bicycle store in Amherst, Mass., for more than 20 years. This experience, combined with his skill as a mechanic, makes him able to repair and...read more
"In terms of finding a puncture on a tube, if you've located either the nail or glass on the tire you can then find the corresponding spot on the tube because the new that the valve lined up with the label at that point. Or, you can just add enough air in the tube until you found where the leak is. In terms of patching or replacing you would hope that the hole is not located near any of the seams because if you do want to patch a hole near one of these seams you have to use the sandpaper that's in the kit to flatten it completely. There's other kinds of punctures called the pinch flat and that is from riding with too low of pressure, hitting something, and putting two holes next to each other in the tube. I usually don't recommend patching this because it really requires a large patch and a lot of sanding in order to get an effective repair."
eHow Article: How to Check a Bicycle Tube for Puncture