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Old 08-12-2007, 07:16 AM   #1
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Question Help - Right Rear Flats on-road

Have had 2 right rears go flat on-road in 11 days.
Is the torn valve stem cause or effect?

Running 31 psi in the 33/12.5R15 BFG T/A KO's on 15x10? steel wheels that were on the Jeep and almost new when I bought it a few weeks ago.

For more details...
http://www.jeepforum.com/forum/showthread.php?t=448907

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Old 08-12-2007, 07:54 AM   #2
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Any construction or roofing going on in the area? Could also be a bead leak. Or even a leaking/cracked rim since you have steel wheels.

Hard to say without seeing it in a dunk tank.
If you want you could get a kiddy pool from wally world put about a full bottle of dawn dish soap and fill full enough to submerge the tire. Slow leaks are a pain but after the water settles you should see a stream. Might have to look carefully as I have seen some leak one bubble at a time. If it is a large leak you will soon be covered in suds.

Make sure the tire is at the max pressure listed on the sidewall.

Oh yeah and valve stems are randomly torn on the road but most of the time they are torn on install. Ask for a bolt in steel stem. Most tire shops have them in stock.

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Old 08-12-2007, 09:15 AM   #3
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No construction in the area traveled between checking pressure friday afternoon and getting flat saturday afternoon.
Sidewall gives max load at 35 psi and says "never inflate beyond 40 psi"
So the 31 psi I was running seemed reasonable.

After the first flat, tire was still in good shape and I found the torn stem before I took it to the shop. Then the shop said they couldn't find any other problems, and mounted it on the spare carrier.

2nd flat was a different wheel & tire. I just checked it and see no evidence of a puncture. I guess something could have gone thru the sidewall near the treadline...hard to tell since tire is destroyed from having to ride on the flat a while.

2 right rears, 2 different wheels/tires, seems too much of a coincidence for me. At first I thought I may have let the pressure get too low causing the first one. So I was keeping a close eye on pressure after that.

My engineering personality wants to understand why.
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Old 08-12-2007, 09:25 AM   #4
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Pressure maxed out was to check the tire under water. 31-35 is where I run My 33's. Does anyone around there have a problem with you like a discruntled neighbor. Sounds a bit strange to me. I know we have a real problem in this area with thorns that get about 3 inches long and fall of the plants and pierce tires but that would be noticed in a shop I would think. Might just be road damage to the rubber stems. I went to the steel and brass stems a long time again because I kept ripping them off on the trail. Might be worth the extra couple of bucks.
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Old 08-12-2007, 09:49 AM   #5
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Thanks...I'll take it back to the shop where they were purchased by previous owner and see what they'll say/do.
Happened too late Saturday afternoon to get it to the shop.

I wonder if there is a way to tell when they were manufactured...concerned they may have just been purchased, but may have been sitting in someone's warehouse for coupla years.
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Old 08-12-2007, 09:51 AM   #6
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Quote:
Originally Posted by exmxr73 View Post

I wonder if there is a way to tell when they were manufactured...concerned they may have just been purchased, but may have been sitting in someone's warehouse for coupla years.
That I have no clue. There might be a date stamp on the inside of the rim but not sure.
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Old 08-14-2007, 07:34 AM   #7
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BFG site showed me how to tell the manufacture date:
last 4 digits of the "DOT" number on the sidewall are as follows:
mine say 2503 indicating they were manufactured the 25th week of 2003.
I put a question in to BFG about accepable "shelf life" and am waiting for a response.

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