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<blockquote data-quote="timoyz" data-source="post: 218315" data-attributes="member: 10">Wow, looks like I switched out a 30 year old, brand new tire.[ATTACH=full]31520[/ATTACH]Prior to the year 2000 there was only 3 symbols used for identifying the week and year of a tire's fabrication. The regulations controlling this only stipulated that the last number would show the digit of the year so that each decade the number could be repeated, eg. 1980 and 1990 would both use a zero.At that time it was very rare for a tire to be in use for any period as long as 10 years and even if it were the type of tread design and other characteristics of the tire would make it pretty evident as to which decade a tire belonged.Wikipedia claims that during the 1990s that a small triangle followed the last number to indicate that it was manufacturered in that decade, however, this is not in the DOT regulations and I have never seen it in use. Read more: <a href="https://www.tire-information-world.com/tire-age-and-dot-code.html#ixzz54v9DHh2y" target="_blank">https://www.tire-information-world.com/tire-age-and-dot-code.html#ixzz54v9DHh2y</a><a href="https://www.tire-information-world.com/tire-age-and-dot-code.html" target="_blank">https://www.tire-information-world.com/tire-age-and-dot-code.html</a></blockquote>

[QUOTE="timoyz, post: 218315, member: 10"] Wow, looks like I switched out a 30 year old, brand new tire. [ATTACH=full]31520[/ATTACH] [I]Prior to the year 2000 there was only 3 symbols used for identifying the week and year of a tire's fabrication. The regulations controlling this only stipulated that the last number would show the digit of the year so that each decade the number could be repeated, eg. 1980 and 1990 would both use a zero. At that time it was very rare for a tire to be in use for any period as long as 10 years and even if it were the type of tread design and other characteristics of the tire would make it pretty evident as to which decade a tire belonged. Wikipedia claims that during the 1990s that a small triangle followed the last number to indicate that it was manufacturered in that decade, however, this is not in the DOT regulations and I have never seen it in use. Read more: [URL]https://www.tire-information-world.com/tire-age-and-dot-code.html#ixzz54v9DHh2y[/URL][/I] [URL]https://www.tire-information-world.com/tire-age-and-dot-code.html[/URL] [/QUOTE]

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