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Old 09-28-2015, 07:11 PM   #1
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One tire always 10psi low

I have 8 tires on my rig. Seven of them hold their air just fine. One of them always drops from 80psi (my desired fill) to 70 over the course of a week or so. It never drops below 70, after many months of experimenting.

Do I just have a really slow, partial leak?
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Old 09-28-2015, 07:15 PM   #2
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Sounds like it. Perhaps you should take it to a tire guy and have them check out the tire or the valve.
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Old 09-28-2015, 07:45 PM   #3
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If it's an aluminum rim you could have a small crack in it.. One of our friends has that happen this summer.. took a while to find it.
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Old 09-28-2015, 08:38 PM   #4
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Do you have valve extenders? If so, check those first for a leak.
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Old 09-28-2015, 09:50 PM   #5
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Thanks, all. No valve extender on this outside tire. I'll take it in for a look-see.
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Old 09-28-2015, 09:57 PM   #6
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A rusty bead on the wheel (rim) will do that. The seal of the rubber tire against the bead is poor enough to leak until the pressure drops to the point where the seal will hold. Sometimes just dismounting and remounting the tire will fix it.

Could also be a crack in the valve or a poor seal where the valve mates to the wheel. I'd put a new valve in while the tire is dismounted.
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Old 09-30-2015, 10:33 PM   #7
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Could be a nail in the tire!
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Old 09-30-2015, 10:48 PM   #8
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Valve stem insert leaking, extender if so equipped leaking, nail or similar in the tire. Else take it and have it checked.
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