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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-15-05, 08:13 PM   #1
EJ123
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tire question

So generally if I have a flat tire, is it most likely the inner tube has a hole or the tire tire thing? Im takin my bike in tomorrow to have them switch it cause i have an xtra tube, and don't want to bring it home and have it flat again in 2 days again lol...
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Old 09-15-05, 08:22 PM   #2
John E
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1) Yes, you have a hole in the inner tube itself.
2) You may still have a sharp object (thorn, nail, rock, glass shard, whatever) embedded in the tire casing. If you do not clean this out, your new tube will go flat, as well.
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Old 09-16-05, 05:07 AM   #3
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John E is right, but another cause of flats is the pinch flat or snake bite, which you can read about here: http://www.sheldonbrown.com/brandt/snakebites.html.

If you can't locate the puncture in the tube by eye or feeling for air when it's inflated, submerge the tube in water and look for air bubbles. One hole: see John's answer, then look for the object in the tire that caused the puncture, including checking the rim for anything that might have been the source. Two holes: pinch flat, so inflate your tires properly and try to avoid potholes or such. If the air is coming from the valve, you probably caused the problem while inflating the tube, so be gentler and more careful when inflating and when disengaging the pump head from the tire.
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