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« on: May 15, 2017, 12:31:21 PM » |
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Bike on lift to check tire pressures and to do some cleaning.
Front wheel turned so the 90 degree metal valve is at about 2 o'clock.
Valve cover removed and pressure gauge applied.
As I remove the pressure gauge I hear the sound of air escaping the tire.
First thought is "It's the Dyna Beads getting stuck in the valve" as mentioned elsewhere on the forum.
So I remove the stem and carefully insert a thin piece of wire to dislodge any foreign objects.
Stem back in and tire aired up. Remove air pump and the valve is still hissing at me.
Whilst the tire is airing up I check the rear pressure at which point I find the pressure gauge has now broken. Grrrrrr. It wont hold the reading. The dial arrow slowly sinks back to 0.
Stem back out and off to Cycle Gear where I'm given 9 gratis. Pep Boys for anew gauge.
New stem back in. New pressure gauge works. 42 psi in tire.
All is good.
Was I close to catastrophically losing the air in the front tire???
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« Last Edit: May 15, 2017, 12:49:09 PM by Britman »
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hubcapsc
Member
Posts: 16799
upstate
South Carolina
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« Reply #1 on: May 15, 2017, 12:33:22 PM » |
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Do you have OEM plastic valve stems?
-Mike
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« Reply #2 on: May 15, 2017, 12:48:41 PM » |
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Do you have OEM plastic valve stems?
-Mike
Jake Wilson metal |
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Jess from VA
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« Reply #3 on: May 15, 2017, 01:51:57 PM » |
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If you had a metal stem in there that was somehow leaking, it seems it would only go down as fast as you were observing, and not traumatically, even under riding stress. Though it could have gone down reasonably quickly (X minutes), you probably would have felt it in time to slow down and get off and look.
Not like an OE stem, cracked at the rim, and blows off.
Also it depends on the riding. Curves are going to feel weird quickly. Straight and level, it could take until you started wobbling/wallowing at pretty low pressure.
And a car tire, having a few wobbling tendencies anyway from time to time, a guy could easily mistake some wobble from his car tire, when the front is actually getting low.
I try to check my tires every single time I ride. But if they were good yesterday, I might not check today.
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« Reply #4 on: May 15, 2017, 02:25:13 PM » |
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Front.
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Daniel Meyer
Member
Posts: 5493
Author. Adventurer. Electrician.
The State of confusion.
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« Reply #5 on: May 15, 2017, 03:06:20 PM » |
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Hissing from the port or elsewhere? If just from the port, I'd change the valve core for sure...elsewhere I'd change the entire thing...bad o-ring or loose or?
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CUAgain, Daniel Meyer  |
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« Reply #6 on: May 15, 2017, 03:18:38 PM » |
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Hissing from the port or elsewhere? If just from the port, I'd change the valve core for sure...elsewhere I'd change the entire thing...bad o-ring or loose or?
Only port . new stem fixed it. |
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Hook#3287
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« Reply #7 on: May 15, 2017, 04:14:15 PM » |
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I've had defective stems in brand new metal valves in the past.
I guess sometimes things just go bad, be glad you caught on the lift and not on the road checking your pressure.
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« Reply #8 on: May 15, 2017, 05:34:23 PM » |
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I've had defective stems in brand new metal valves in the past.
I guess sometimes things just go bad, be glad you caught on the lift and not on the road checking your pressure.
Yep. I've added the spares to my travelling tool kit. |
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Daniel Meyer
Member
Posts: 5493
Author. Adventurer. Electrician.
The State of confusion.
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« Reply #9 on: May 16, 2017, 08:02:34 AM » |
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I've had defective stems in brand new metal valves in the past.
I guess sometimes things just go bad, be glad you caught on the lift and not on the road checking your pressure.
Yep. I've added the spares to my travelling tool kit. Good idea....I've always carried valve stems and a core tool (and thus, you can pull the cores if you need 'em)...because the cores certainly do fail...and usually when you're checking/adding air... |
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CUAgain, Daniel Meyer |
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« Reply #10 on: May 16, 2017, 08:04:48 AM » |
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I've had defective stems in brand new metal valves in the past.
I guess sometimes things just go bad, be glad you caught on the lift and not on the road checking your pressure.
Yep. I've added the spares to my travelling tool kit. Good idea....I've always carried valve stems and a core tool (and thus, you can pull the cores if you need 'em)...because the cores certainly do fail...and usually when you're checking/adding air... Oh yeah,  it would help if I put the core tool in the zip loc with the stems  |
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Daniel Meyer
Member
Posts: 5493
Author. Adventurer. Electrician.
The State of confusion.
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« Reply #11 on: May 16, 2017, 11:57:11 AM » |
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I've had defective stems in brand new metal valves in the past.
I guess sometimes things just go bad, be glad you caught on the lift and not on the road checking your pressure.
Yep. I've added the spares to my travelling tool kit. Good idea....I've always carried valve stems and a core tool (and thus, you can pull the cores if you need 'em)...because the cores certainly do fail...and usually when you're checking/adding air... Oh yeah, it would help if I put the core tool in the zip loc with the stems LOL! Minor detail!  |
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CUAgain, Daniel Meyer |
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