Gary,
I am afraid it is the other way around, first the week than the year of
manufacture, see:
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=11
Cheers,
Kees Oudesluijs
NL
Editorgary@aol.com wrote:
> As noted earlier, the life of your tires starts when they're manufactured,
> not when they were sold to you, or when they were installed on your car,
> since their life has more to do with the aging of the compounds in the tires
> than with the actual use of them.
>
> On the sidewall of new tires, you'll find a four-digit code molded into a
> rectangle. The first two digits are the last two digits of the year in the
> 21st century in which it was manufactured, and the last two will be the week
> of manufacture. e.g. 0449 was manufactured in the 49th week of 2004.
>
> If the code you find has only three digits, it works the same way, except
> that it will be the year of the decade and the week of manufacture in the
> last century. e.g. 429 would have been manufactured in the 29th week of 1994,
> or maybe the 29th week of 1984! (When this system was put into place they
> assumed no one would ever use a tire for more than ten years, not counting on
> concours packrats who somehow could manage to produce a set of unused
> Roadspeeds manufactured when their Healey was new).
>
> So, if it doesn't have four digits, it doesn't belong on a car outside a
> museum, and if the code indicates anything from 00 to 05, it's time to check
> it carefully and consider changing it.
>
> Best
> Gary
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