Is a Self-Inflating Tire Worth The Extra Cost?
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Images credit PumpTire Benjamin Krempel has invented the PumpTire , that keeps a bike tire inflated at the proper pressure. Gizmag explains how it works: Air is drawn from the atmosphere through the one-way valve, which protrudes from the rim like a regular valve stem. Instead of going directly into the inner tube, however, the air goes into one end of a lumen, which is a small tube running along the center of the tire [on the outside]. As the tire rolls against the ground, the lumen is compressed, forcing air out of its other end and into a second valve - this one on the inner tube. The resulting absence of air in the lumen creates a vacuum effect, drawing more air in through the first valve. ... Read the full story on TreeHugger