The pumps go up to a maximum of 120 p.s.i., however it does take more than twice as long to achieve 120 p.s.i. as the pump slows down once it hits around 80 p.s.i.

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As illustrated in the graphic above, a regulator in the tire senses when tire-inflation pressure drops below a pre-set point and opens to allow air flow into the pumping tube. As the tire rolls ...

At today's prices, that translates to about 12 cents per gallon at the pump. Properly inflated tires also result in lower emissions, longer tire life, enhanced safety and improved vehicle performance.

I should note that while the pump is rated to inflate to 160 PSI, I didn't inflate anything beyond 80 PSI in my tests. When we got my five-year-old son a new bike, the tires were quite flat.

Inflate the tire of the bike. Remove the lid from the Bicycle wheel, lifts the valve and puts the pump on it. pumps the wheel, removes the pump and closes the lid. Royalty-free licenses let you pay ...