Originally Posted by
Beerslinger
I was looking at pumps today at my LBS. I need a pump that will fill my tires to 110 psi. They had a pump that was rated to 80 psi max that the worker told me would be just fine to inflate up to 110.
How can a pump that's rated to 80 max psi inflate a tire up to 110? Wouldn't the back pressure blow the seals on the pump, or is there some kind of physics lesson I'm missing here?
That pegs my BS-o-meter into the red zone. I doubt very much it will reliably go to 110psi and suspect he's just trying to make a sale and move on to the next customer with the least amount of effort. Generally speaking, manufacturers don't go to the expense of building a pump capable of delivering 110psi and then limit ttheir market and profit margin by selling it as 80psi max. that just doesn't make any business sense at all.
BTW, the best pump in the universe is the Topeak Road Morph.