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Old 09-28-2015, 06:11 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?

2015 Newmar Death Star 4313
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Old 09-28-2015, 06:15 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.

Tom Wilds
Blythewood SC
2016 Newmar Bay Star Sport 3004
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Old 09-28-2015, 06:45 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.
2004 Holiday Rambler DST
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Old 09-28-2015, 07:38 PM   #4
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Do you have valve extenders? If so, check those first for a leak.
2002 Damon Intruder 375 Workhorse
2012 Honda Fit Sport Toad
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Old 09-28-2015, 08:50 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, 08:57 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.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 09-30-2015, 09:33 PM   #7
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Could be a nail in the tire!
Dennis & Marcie & Hook The Jack Russell, 2001 HR Imperial 38wds 350 Cummins, 07 Chevy Trailblazer/Blue Ox/Ready Brake, 04 Dodge 3500 Cummins,
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Old 09-30-2015, 09:48 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.

Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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