Self-Inflating bike tires promise a future free of hand pumps

The PumpTire consists of an inner tube, the tire itself, and a special uni-directional air valve that screws into the stem of the inner tube. When the pump is active, it uses the tire’s rolling motion to draw in air from the atmosphere, through the one-way valve and into a lumen that runs along the outer edge of the tire. As the tire rolls, it squishes the lumen flat, forcing air into the main tube and when the weight of the tire is removed, the lumen re-inflates before it’s rolled over again. The system automatically shuts the valve when the desired pressure is reached. The doesn’t require any special modifications or rims…

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