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Pneumatic Pressure Gage Presta?
We have access to an air line that we could tie into. I was wondering if
anyone knows of a pneumatic pressure gage with indicator for the presta valves? Similar to ones found in gas stations, but for presta valve use. Not sure if one even exist. If not I will use the presta adapter. -tom |
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Tom Nakashima wrote:
We have access to an air line that we could tie into. I was wondering if anyone knows of a pneumatic pressure gage with indicator for the presta valves? Similar to ones found in gas stations, but for presta valve use. Not sure if one even exist. If not I will use the presta adapter. See: http://harriscyclery.net/site/page.c...=49&SKU=PU9997 Sheldon "At Your Service" Brown +-----------------------------------------------------+ | We can complain because rose bushes have thorns, | | or rejoice because thorn bushes have roses. | | --Abraham Lincoln | +-----------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
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Tom Nakashima writes:
We have access to an air line that we could tie into. I was wondering if anyone knows of a pneumatic pressure gage with indicator for the Presta valves? Similar to ones found in gas stations, but for Presta valve use. Not sure if one even exist. If not I will use the Presta adapter. Since most Presta valve chucks have no valve depressor (opener) and Presta valves are inherently sticky due to their tapered valve. Measuring inflation pressure doesn't work well with a reservoir (continuous) pressure supply, the valve being either open or closed. With a piston hand pump, the valve opens abruptly when line pressure exceeds stiction of the valve and allows all air from the pump stroke to enter the tube up to the level of equilibrium. So the reading after each pump stroke is correct. You'll have to balance your options. My floor pump performs that task ideally although a reservoir supply that is largely at a higher pressure than desired (as at gas stations) will not do that. When you release the trigger, you may have no idea what pressure is in the tire and then again you may, depending on the length of hose between the control trigger and Presta Valve. Jobst Brandt |
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Tom Nakashima wrote:
We have access to an air line that we could tie into. I was wondering if anyone knows of a pneumatic pressure gage with indicator for the Presta valves? Similar to ones found in gas stations, but for Presta valve use. Not sure if one even exist. If not I will use the Presta adapter. I already gave a link to one of those. Jobst replied: Since most Presta valve chucks have no valve depressor (opener) and Presta valves are inherently sticky due to their tapered valve. Measuring inflation pressure doesn't work well with a reservoir (continuous) pressure supply, the valve being either open or closed. With a piston hand pump, the valve opens abruptly when line pressure exceeds stiction of the valve and allows all air from the pump stroke to enter the tube up to the level of equilibrium. So the reading after each pump stroke is correct. Sorry, Jobst, you're a bit out of date on this. Modern floor pumps have high tech air chucks that do hold the Presta pin down. These newer units also automatically work for both types of valve. I use a Topeak pump of this description, works fine (though the ergonomics of the lock lever could be improved. Even got a digital pressure readout. The Problem Solvers air chuck/gauge also appears to have one of the newfangled automatic connections. Sheldon "PSI" Brown +------------------------------------+ | A good plan today is better than | | a perfect plan tomorrow. | | --David Mamet | | (Wag the Dog, Bulworth) | +------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com |
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"Sheldon Brown" wrote in message ... Tom Nakashima wrote: We have access to an air line that we could tie into. I was wondering if anyone knows of a pneumatic pressure gage with indicator for the presta valves? Similar to ones found in gas stations, but for presta valve use. Not sure if one even exist. If not I will use the presta adapter. See: http://harriscyclery.net/site/page.c...=49&SKU=PU9997 Sheldon "At Your Service" Brown +-----------------------------------------------------+ | We can complain because rose bushes have thorns, | | or rejoice because thorn bushes have roses. | | --Abraham Lincoln | +-----------------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com That's it Sheldon. In fact the air line on our mating end (quick disconnect) will match the male fitting on the Air-Bob tire inflator you show. We have quite a few riders here, now I need to take up a collection. thanks, -tom |
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Tom Nakashima wrote:
We have access to an air line that we could tie into. I was wondering if anyone knows of a pneumatic pressure gage with indicator for the presta valves? Similar to ones found in gas stations, but for presta valve use. Not sure if one even exist. If not I will use the presta adapter. -tom Be careful not to blow the tyre off the rim if you use an airline. People do it every year when they get distracted and put 250psi into their mountain bike tyres. Makes you jump! |
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