Thread: How much air goes from the tire to the pump when you plug it on the valve?
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Old 04-19-21, 06:34 PM
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downtube42
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A presta pump that mechanically depresses the valve is an abomination.

But the answer is clearly 42psi for a high pressure tire, 4.2psi for a low pressure tire, and 0.42bar for the civilized world.
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