The PumpTire is a revolutionary design by Benjamin Krempel that’s currently up for funding on Kickstarter.
The tire actually employs a mechanism that pumps your bike tires as you
pedal and move along, ensuring that you will never have a flat tire or
ever have to manually pump some air into your tires – if all goes well,
PumpTire is fitted with a valve and a special inner tube that work
hand-in-hand to determine if your tires are full or if they could still
use a pump or two of air. As you can see from the video clip, Krempel
already has a working prototype of the PumpTire, and just needs funds to
ramp up production.
PumpTire features a special valve which, like a conventional valve, can
attach to a bicycle pump for manual inflation but also takes in air as
the tire spins. The air is channeled into a small tube, or "lumen," that
runs around the outside of the tire, where it makes contact with the
ground. The weight of the bike squeezes the air out of the lumen and
into the inner tube. The specially designed valve automatically shuts
off and stops its air intake when the desired tire pressure is reached.
To make his two types of tires -- the City Cruiser for the casual, urban cyclist
and the City Pro High Performance Tire for professional riders --
Krempel needs a hefty cash injection. He's asking for $250,000 on
Kickstarter, and has raised $12,000 so far, with a month or so to go.
If his funding drive is successful, Krempel and his company
will sell the Cruiser wheel set for $64.95 (£50 with international
shipping) and the Pro kit for $129.90 (about £100 with postage to