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Intro:
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Carefully pull the inner tube out from under the tire. You should be able to push a Schraeder valve through the hole in the wheel rim to remove the tube, but you'll have to unscrew a small metal retaining collar if you have a Presta valve setup. Try not to bend the valve when you pull out the tube. If you plan to replace the damaged tube with a new tube, skip to Step 5. If you're going to patch the tube, you'll have to find the hole. Repairing a tube is cheaper than replacing it, but sometimes the damage is too severe. In these cases, or if the problem turns out to be a previous patch that has failed, your best bet is to replace the tube. After removing the tube, use the pump to inflate it. Examine the full tube carefully--you might get lucky and spot the problem. But if the puncture isn't obvious, hold the tube close to your ear and slowly rotate it as you listen for the hiss of air escaping. If you're at home, you can submerge part of the tube in a shallow pan of water and rotate it slowly (you'll be able to find the puncture by watching for air bubbles). If you still can't find a puncture, check the valve's condition. If it's cracked or severely worn, you'll have to replace the tube.
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Find the hole
