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  #1  
Old 01-25-2005, 01:24 PM
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LA525iT LA525iT is offline
swinging a big stick
Location: Marina del Rey, CA
 
Join Date: Oct 2003
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Mein Auto: 03 525iT & 06 Z4 3.0si
How does screw not puncture tire?

So I hear this clickety-click driving around the other day and figure it's just a stone in the treads. Park car with wheels turned and notice big fat screw stuck in the front tire between the treads.

Go down to the local Shell station to get it pulled out and plug the hole. Nice guy pulls out the screw and does the "bubble test" thing to test for air leak. Nothing.

I thank him and go home in disbelief. Two days later, tire still at full pressure. How does a low profile tire (235/45/17) take a big screw right on the middle of its treads not spring a leak when removed???????
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  #2  
Old 01-25-2005, 01:25 PM
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Kaz Kaz is offline
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Short screw? Went in at an angle?
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  #3  
Old 01-25-2005, 01:33 PM
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LA525iT LA525iT is offline
swinging a big stick
Location: Marina del Rey, CA
 
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Quote:
Originally Posted by Kaz
Short screw? Went in at an angle?
Bout 1/4-1/2" screw went straight into the face of the tire at 90 degree angle between the treads.
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  #4  
Old 01-25-2005, 01:37 PM
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James James is offline
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Quote:
Originally Posted by LA525iT
Bout 1/4-1/2" screw went straight into the face of the tire at 90 degree angle between the treads.
I think there is a lot of stuff between the rubber and the air. Seems to be more then 1/2" there...which is more then I would have expected. Perhaps this bladder (I know, it's not really a bladder...) is flexible as well so the screw would puncture the rubber but just push in this other stuff without going through it?

http://www.puresportscar.com/specs/A...nstruction.jpg

James.

Last edited by James; 01-25-2005 at 01:40 PM.
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  #5  
Old 01-25-2005, 01:49 PM
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Kaz Kaz is offline
King of Rear Clunks
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Quote:
Originally Posted by LA525iT
Bout 1/4-1/2" screw went straight into the face of the tire at 90 degree angle between the treads.
Well, a new tire generally has 5/16" of tread, and I'd guess the carcass is another 3/16" thick or so, so even on a worn tire, 1/4" isn't going to go all the way through. And the innermost layer of the carcass probably has a bit of elasticity in it.
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  #6  
Old 01-25-2005, 05:37 PM
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ObD ObD is offline
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Just lucky and the screw hit one of the steel belts.
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  #7  
Old 01-25-2005, 06:31 PM
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RSPDiver RSPDiver is offline
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Location: SC
 
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I hate you! I just had to replace a rear Pilot Sport because a screw went in and went into the air chamber by about 1/16 inch!

Seriously though, good for you!
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  #8  
Old 01-25-2005, 10:02 PM
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TeamM3 TeamM3 is offline
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are you sure the tire guy didn't hypnotize you and then say over and over "the tire will appear full of air, the tire will appear full of air, ..."

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  #9  
Old 01-26-2005, 07:08 AM
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In summary, because your are a lucky, lucky, bastard....
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  #10  
Old 01-26-2005, 08:16 PM
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woohoo woohoo is offline
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Location: SF Bay Area
 
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Yeah I got a nail in my Pilot Sports a while ago. It only had a few thousand miles on it too!
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  #11  
Old 01-26-2005, 10:04 PM
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swchang swchang is offline
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Location: Baltimore/DC area
 
Join Date: Oct 2003
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Mein Auto: BMW, M-B, Honda
Quote:
Originally Posted by woohoo
Yeah I got a nail in my Pilot Sports a while ago. It only had a few thousand miles on it too!
That's nothing. I hit a pothole less than one month after I got my car. Blew out the sidewall on a less than 1000 mile old tire.
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