If you are a bicycling enthusiast, you may have had an experience with flat tires. Using a hand pump to fix your tire can be frustrating. Often times bikes lose pressure through sidewalls, which requires routine hand pumping. A San Francisco start-up called PumpTire has created a way for the tires to inflate themselves again.
The PumpTire has an inner tube, the tire, and a uni-directional air valve that gets screwed into the stem of the inner tube. Once the pump is activated, the PumpTire uses the tire’s rolling motion to draw air in from the atmosphere through the one-way valve and into a lumen that is on the outer part of the tire. When the tire rolls, the lumen is contracted flat, which forces air into the main tube. Once the weight of the tire is remove, the lumen re-inflates. The PumpTire then shuts the valve automatically when the desired pressure is reached.
The PumpTire will be available in two different forms:
1.) The City Pro – 700c x 28mm tire with a max 100 psi
2.) The City Cruiser – a 26″ x 1.5″ tire with a max 65 psi.
PumpTire is currently seeking funding through Kickstarter. They have about 40 days to raise $250,000 and they have raised $4,531 as of the time that I wrote this article.
PumpTire was founded by Benjamin Krempel and the company was a semi-finalist for the MIT $100K Business Plan Competition.
[Donate to PumpTire on Kickstarter]