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This is actually the opposite of the truth. A schrader valve requires the pin to be pushed mechanically (it's normally held closed by a small spring). Therefore the valve is open the entire time that the pump is attached. The reason that the schrader takes longer to pump from 100 to 110 is because you are losing air between strokes of the pump whereas the presta valve is only open when the pressure in the pump exceeds the pressure in the tire, so you are not losing air between strokes.
– Yes I use MUMPS
Commented Mar 21, 2013 at 15:35

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