Originally Posted by
cinegabe
Anyone have some input that doesn't sound like a cop out?
To get a realistic comparison between pumps, you need to fully deflate a tire (or take it down to a fixed pressure), pump it to X psi using Pump A counting how many full strokes it takes, deflate the tire back to the starting point, pump it back to X psi using pump B counting how many full strokes it takes and compare the number of strokes each pump took.
That's the way I've typically seen pumps compared. Number of full strokes to fill an certain sized tire to X psi.
Aside from the various atmospheric differences, the number of strokes to get a tire from 110 psi to 120 psi will be far more than the same pump getting the same tire from 10 psi to 20 psi. Try that with YOUR pump on YOUR tire and see if you still think the earlier posts are "cop outs".