Because we make the circumference of the rubber greater than that of the rim, the rubber compresses and squeezes the gap out of the tire. This technique also keeps the rubber tire from opening up when the bike is ridden. Thanks for the inquiry. Wheelmen bulletin No. 4, written by Bob McNair, is a good intro as to how to properly install new tires and an understanding of how it all works. It is available on the Wheelmen web site under reference materials.beginner question here, how do you joint both ends together?
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