In Brief

PumpTire uses the rhythmic compression of the rotating wheel to maintain pressure

Despite the impressive array of innovative bikes we’ve covered recently, many economically minded people are cruising around on 20-year-old bikes that suit them just fine. If your bike is that old and has its original tires, chances are that one or both of them continually lose small amounts of air. This process is known as diffusion.

But next time you finally decide to replace your tubes, you might not have to worry about overfilling them as a precaution anymore because an enterprising Swiss developer named Benjamin Krempel has developed a bike tube called PumpTire that uses the rhythmic compression of your tires to refill them to a set pressure, and keep them there.

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