#1
|
|||
|
|||
Tire Pressure Gage
I have a pressure gage on my tire pump but have been wondering about whether a separate pressure gage might not be helpful. 700C 28 or 32, presta valve, tires, at ~90 - 100 psi, and I've pumped them up approximately every one to two weeks mainly based on the "Squeeze Test". I've noticed that connecting the tire pump to the tire and pumping that the air pressure in the pump and hose rise until they overcome the tire valve and for an instant the approximate tire pressure is registered and sometimes if I had known the tire pressure I wouldn't have used the pump. Thus the thought that a gage might be useful. On the other hand, it does take a finite amount of air to operate the gage so each time one checks the pressure it reduced the tire pressure by some figure. So the question is whether using the gage with 28 - 32mm tires is going to cause a significant pressure loss over, say 4 or 5 checks and will it, in fact, result in fewer pump-ups... not that pumping up tires is really that onerous a task :-) -- Cheers, John B. |
Ads |
#2
|
|||
|
|||
Tire Pressure Gage
On 4/24/2014 11:31 PM, John B. wrote:
I have a pressure gage on my tire pump but have been wondering about whether a separate pressure gage might not be helpful. 700C 28 or 32, presta valve, tires, at ~90 - 100 psi, and I've pumped them up approximately every one to two weeks mainly based on the "Squeeze Test". I've noticed that connecting the tire pump to the tire and pumping that the air pressure in the pump and hose rise until they overcome the tire valve and for an instant the approximate tire pressure is registered and sometimes if I had known the tire pressure I wouldn't have used the pump. Thus the thought that a gage might be useful. If you tap the presta valve before pumping to break the air seal doesn't this get rid of this problem? Or am I missing something? On the other hand, it does take a finite amount of air to operate the gage so each time one checks the pressure it reduced the tire pressure by some figure. So the question is whether using the gage with 28 - 32mm tires is going to cause a significant pressure loss over, say 4 or 5 checks and will it, in fact, result in fewer pump-ups... not that pumping up tires is really that onerous a task :-) |
#3
|
|||
|
|||
Tire Pressure Gage
On Fri, 25 Apr 2014 08:06:48 -0400, Duane
wrote: On 4/24/2014 11:31 PM, John B. wrote: I have a pressure gage on my tire pump but have been wondering about whether a separate pressure gage might not be helpful. 700C 28 or 32, presta valve, tires, at ~90 - 100 psi, and I've pumped them up approximately every one to two weeks mainly based on the "Squeeze Test". I've noticed that connecting the tire pump to the tire and pumping that the air pressure in the pump and hose rise until they overcome the tire valve and for an instant the approximate tire pressure is registered and sometimes if I had known the tire pressure I wouldn't have used the pump. Thus the thought that a gage might be useful. If you tap the presta valve before pumping to break the air seal doesn't this get rid of this problem? Or am I missing something? I was trying to point out that sometimes when I used the pump I didn't need to. But yes, poking the valve stem enough to "un stick" it makes it easier . On the other hand, it does take a finite amount of air to operate the gage so each time one checks the pressure it reduced the tire pressure by some figure. So the question is whether using the gage with 28 - 32mm tires is going to cause a significant pressure loss over, say 4 or 5 checks and will it, in fact, result in fewer pump-ups... not that pumping up tires is really that onerous a task :-) -- Cheers, John B. |
#4
|
|||
|
|||
Tire Pressure Gage
- John B. / Fri, 25 Apr 2014 05:31:36 +0200
Better idea: get an adapter for car-type valves and check the pressure at the gas-station. Many manometers sold for bikes have toy quality - even expensive ones tend to show phantasy values. With the French type valves you use (which are good), presure can only be checked by filling to a higher level. These valves are made for high-pressure slim racing tires which have to refilled quite often anyways, so ther is no test-mode intended by design. jk -- no sig |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
CO2 valves with pressure gage? | John | Techniques | 1 | March 8th 05 06:30 PM |
FS: Accu-Gage Bicycle Air Pressure Gauges... New | Ground Zero | Marketplace | 0 | March 3rd 05 04:36 AM |
FS: Accu-Gage Bicycle Air Pressure Gauges... New | Ground Zero | Marketplace | 0 | February 4th 05 05:12 AM |
Pneumatic Pressure Gage Presta? | Tom Nakashima | Techniques | 5 | February 3rd 05 05:58 PM |
FS: Accu-Gage Bicycle Air Pressure Gauges... New | Ground Zero | Marketplace | 1 | December 28th 04 04:08 AM |