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Tractor Talk Discussion Board

Re: OT: Do tires get too old?


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Posted by jdemaris on November 08, 2010 at 13:49:28 from (67.142.130.37):

In Reply to: OT: Do tires get too old? posted by soder33 on November 08, 2010 at 12:39:12:

Yes, but there is no sure way of knowing - unless you see dry-rot cracks. Some tires easily last 20 years and some others don't last over 5 years. All depends on the rubber-mix. Sunlight and ozone makes them go bad faster, but so does a bad mix of rubber.

Date code is stamped on only one side of the tire. Some states have been considering making tires illegal for highway use after 10 years old.

Tires made since year 2000 have a four-digit date-code on one-side, only. So, a code like "DOT U2LL LMLR 5107" means it was made the 51st week of year 2007 (or year 1907 I guess). Having two digits for the year mades it pretty certain.

Tires made 1999 and back, only show the last digit of the year they were made. So, "DOT EJ8J DFM 408" means made in the 40th week, and the year could be 2008, 1998, 1988, etc.

My 83 plow-truck has cheap no-name tires on it that I bought used around 1985 - and they are still fine. They are too old to have accurate date-codes, so I have no idea when they were actually made.

To the converse, I've got two sets (4 each) of Wranglers that aren't even 10 years old and they got so dry-rotted, I had to stop using them. Four that are 235/75-15" and four that are 235/85-16".


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