Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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The tube needs only to be airtight and the right size for the tire. If you take a tube and pump it up, it will expand until it explodes. However, inside the tire, the tube has not only the air pushing on it from the inside, but the tire and rim pushing on it from the outside! So it can withstand any pressure as long as the tire can support it.