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Location: Rochester, NY
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Riding a tire under inflated will often result in the tire trying to shift rotationally around the wheel. The tube, however, is trapped in place by that pesky valve. So the tire shifts around dragging the tube with it and the tube bunches up on one side of the valve and is stretched out on the other side. Very often the valve becomes canted in the rim as it' base is being pulled one way and pushed from the other way. Andy
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AndrewRStewart