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Old 11-09-2009, 06:52 PM   #1
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Rear tire went completely flat overnight, now holding air

I went to ride out this morning to meet the sisters up for lunch, and noticed my rear tire was flat. Took the truck instead. Just put 40 psi in it, went around the neighborhood for about 5 miles, checked the tire. Up to 41 psi. Seems about right. Didn't really get above 35. mph, so it wouldn't warm up that much. Freak occurrence, or is it time for a new tire? I've had it happen with automotive tires a few times too.
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Old 11-09-2009, 06:56 PM   #2
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Probably has a slow leak you are not catching... Check it in the AM again and see if it goes flat again or if pressure is less!!
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Old 11-09-2009, 07:00 PM   #3
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Weird....maybe the valve stem leaks intermitantly.
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Old 11-09-2009, 07:05 PM   #4
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just got stranded on a ride due to new front tire going flat, thanks valve stem...

most shops just "look" at the stem to see if it "looks" good...
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Old 11-09-2009, 07:06 PM   #5
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Probably has a slow leak you are not catching... Check it in the AM again and see if it goes flat again or if pressure is less!!
No, I just rode it yesterday evening. I make it a habit to check the pressure every other day. So I know it's not a slow leak. I'll check it in a bit.
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Old 11-09-2009, 07:11 PM   #6
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Quote:
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just got stranded on a ride due to new front tire going flat, thanks valve stem...

most shops just "look" at the stem to see if it "looks" good...
Every tire change should include a new valve stem.
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Old 11-09-2009, 07:15 PM   #7
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Quote:
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Every tire change should include a new valve stem.
yeah no , it SHOULD. but not all shops change them. i try and change mine myself, but sometimes its just easier when you have a set or two that need to be done, to let a shop do them.
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Old 11-09-2009, 07:20 PM   #8
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The valve cores can stick from time to time (dirt, water, etc getting trapped in the seals).

After you check it next time, make sure you check the seat of the valve (a little spit on your finger to ensure it's seal).

I also agree with Andy. New tire = new valve stem. EVERYtime.
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Old 11-10-2009, 10:37 AM   #9
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Well the tire didn't lose any air overnight. I rubbed soapy water all around the valve stem and moved it around, no leaking at all. Rubbed soapy water all around where the tire and wheel meet, no leaks. No nails or anything else wrong with the tire. Should I remove the valve core and get some soapy water in the threads? To make sure the valve stem is seating?
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Old 11-10-2009, 10:41 AM   #10
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maybe someone let the air out of your tire
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Old 11-10-2009, 10:45 AM   #11
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maybe someone let the air out of your tire
It sleeps in a locked garage. Only person with access is my dad. I highly doubt it was him.
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Old 11-10-2009, 11:04 AM   #12
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Old 11-10-2009, 11:07 AM   #13
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Old 11-10-2009, 11:35 AM   #14
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Could be weather change, cant see losing 40lbs of air over night though. How long was it sitting before you noticed/last rode it? It could have been low from your last ride (20lbs)and lost the air. I have had car and truck tires loose air over night when the temp changes (colder).
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Old 11-10-2009, 12:38 PM   #15
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Quote:
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Well the tire didn't lose any air overnight. I rubbed soapy water all around the valve stem and moved it around, no leaking at all. Rubbed soapy water all around where the tire and wheel meet, no leaks. No nails or anything else wrong with the tire. Should I remove the valve core and get some soapy water in the threads? To make sure the valve stem is seating?
No. Leave it alone. Only thing I'd recommend is: when you check the tire, check the seal. You'll be okay unless you check, add, or remove air.
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Old 11-10-2009, 12:47 PM   #16
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i dont see a tire deflating for no reason. that is weird. one time i had a flat, i refilled it, and stayed inflated overnight. i guess i parked on the hole of the slow leak, cause after i got out of work it was flat again.

as far as stem being changed everytime, i agree with that too...but you would be suprised how many people get bitchy and assume the shop is just finding another way to jack up the price by charging for stems.

really every shop should do it and include the stems in the price.
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Old 11-10-2009, 12:58 PM   #17
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Somebody had to let the air out... Maybe pops was giving you a hint to quit riding!!
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Old 11-10-2009, 01:17 PM   #18
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Somebody had to let the air out... Maybe pops was giving you a hint to quit riding!!
Haha I doubt that. He rode a BMW for years and rode a Fantic trials bike after he gave up street riding.
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Old 11-10-2009, 01:31 PM   #19
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Back when I rode my 500, I had a friend give me those caps that you can put on the valve stem that reads tire pressure. After a ride my front tire was completely flat. I had never had a problem wit that before, so I attributed it to the cap. I took it off, filled the tire, and sure enough never again had the problem.

Maybe you had a slow leak, but just didn't notice it til it got completely flat.
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Old 11-10-2009, 01:35 PM   #20
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Replace your tire.

It could be that the way it was sitting the other night, the tire was positioned in such a way that it 'opened' up the leak. When you are moving, it may not be sitting in that position long enough for it to (noticeably) leak out.

Even submerging the tire in a bucket of water may not reveal the leak...if the only time it leaks is when weight is put on the tire or it is positioned a certain way.
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