How much air goes from the tire to the pump when you plug it on the valve?
04-22-21, 08:07 AM
#76
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True, until you make your first pump that does release the valve, so that you can have a pressure reading in the first place.
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04-22-21, 10:54 AM
#77
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One solution for presta valves is to loosen the top nut, tap the nut to break the seal, then screw on a Schrader adapter and use a Schrader pump head. No air will be lost. Apparently, some mini-pumps also have this problem, where air is lost while removing the head.
04-22-21, 11:05 AM
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04-22-21, 11:08 AM
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04-22-21, 11:09 AM
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Ever try to open the fridge door super quick to see if the light really goes off when you close it?
04-22-21, 11:11 AM
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04-22-21, 11:34 AM
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04-22-21, 11:43 AM
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04-22-21, 11:51 AM
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Lose air into the pump? Why would that matter? Aren't you going to pump it up anyway? And it can't be because you need an accurate pre-pump reading if the valve doesn't open.
04-22-21, 11:55 AM
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Solution to what? Why would anyone go through all that? Just put the chuck on and inflate the stupid tire. Take the chuck off quickly and go ride. No problem.
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04-22-21, 11:56 AM
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04-22-21, 03:10 PM
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04-22-21, 05:24 PM
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Also, pump is not an air pressure checking device. When I take my pump from its place, you can be damn sure the tire needs some air added to it and the gauge is used as an indicator when to stop adding. I repeat, it is not to be used just to check, when you don't intend to pump air. For that, use those small gauges made for the purpose, ie. not part of a pump.
It seems people consider air pump such a simple device that it is beneath them to devote some thinking as to how it operates, or in the case of some chinese knock off pumps, how they should be operated correctly.
Last edited by vane171; 04-22-21 at 05:31 PM.
04-22-21, 06:28 PM
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I recently sheared the stem off the tube in my front tire while removing the pump. So in that case the answer was around 75 pounds. dave
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04-23-21, 10:07 AM
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04-23-21, 02:50 PM
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04-26-21, 04:18 PM
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