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Old 08-08-2015, 02:54 PM   #1
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Tire Build Code

Somewhere I read a post that deciphered the codes to determine when a tire was built. I recently purchased a 2009 25' Int. that has has GYM tires and I don't know how old they are. I did a search and can't find the post. Any help appreciated.

Thanks!
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Old 08-08-2015, 03:00 PM   #2
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The manufacture date of tires are on the sidewall usually in an oval outline. The date consists of the week and year. for instance 3911 would mean that the tire was manufactures in the 39th week of 2011.

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Old 08-08-2015, 03:06 PM   #3
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Here ya go ... one of many out there.

http://www.tirerack.com/tires/tirete....jsp?techid=11

One of the tires I recently replaced on my 75 Overlander could possibly have been original.
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Old 08-08-2015, 03:40 PM   #4
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How to find where tires are made:

Look on the tire. Look at the molded in DOT code. The first two letters/numbers are the country of origin and the plant which made them.

Go to All the D.O.T. Tire Plant Codes to find the information based on the code.

This was published in Trailer Life.
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Old 08-08-2015, 09:12 PM   #5
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Thanks! I'll check the age of the tires tomorrow now that I know how to determine when they were made.
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Old 08-09-2015, 06:26 AM   #6
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Barry's Tire Tech
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Old 08-09-2015, 10:05 AM   #7
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The build date for all four tires is 1312 which means they are about 39 months old. They are GYM tires. Tread and sidewalls look good.

What do you think? I will be taking it from PA to FL this winter and back again in March. Is it time to replace or can I go till next spring?
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Old 08-09-2015, 08:07 PM   #8
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Tire Build Code

You are fine a 5-6 years is the normal recommended replacement cycle.Any longer and you are gambling.Tires dry rot from the inside out normally there are no visible signs(I deal in vintage exotic cars Lamborghini,Ferrari etc).


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Old 08-10-2015, 11:57 AM   #9
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If the trailer has been in covered storage you should be ok. If it has been outside since new I would change the tires just to be safe and buy a tire monitoring system either way. My GYMs were cracking on the outside after 2 years stored outside with tire covers. The Florida sun is brutal on tires when in direct sunlight. Our newest AS is stored in the garage and we will change tires based on tread depth or 5 years whichever comes first. Have a safe and fun trip.
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