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Go Back   REVscene Automotive Forum > Technical Discussion > Suspension, Brakes , Wheels & Tires Tech

Suspension components, brakes, Wheels and Tires. All things related to how your car handles...

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Old 04-02-2012, 08:21 PM   #1
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What's the deal with date stamps on tires?

is it really true that they somewhat 'expire' 6 years after the date stamp?

i.e. the date stamp on one of my tires is that means, the tire was manufactured during the 15th week of 2008.

however..when someone buys a used car with original tires, those tires can be super old...

how paranoid are you? is it just a marketing gimmick? or does a tire truly
start to disentegrate after the 6 years?
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Old 04-02-2012, 10:10 PM   #2
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There are factors other than age and tread depth.

If the rubber is old and hard, the outer layer will be cracking and provide terrible traction. I've seen 2 year old tires that are hard and cracked that I wouldn't feel comfortable driving on.

My gf's sister asked me to sell her winter tires a few years ago and they still had 11/32nds of tread left. When I felt the rubber, they were hard a rocks. I checked the date code and they were made pre-2000. I couldn't sell them in good conscience.

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Old 04-03-2012, 07:12 AM   #3
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Most manufacturers recommend changing tires after 7 years (due to rubber losing its elasticity). If I recall, the government says a tire "must" be replaced after 10 years, no mater the condition/wear.
Some manufacturers offers "unlimited warranties" on their tires (Pirelli's P4 has an Unlimited year/135 000km warranty), but I have no idea what happens if you have such tire and they start cracking.
Long story short, a quality tire can last more than 6 years, but the rubber lose its elasticity and it's not recommended to keep em more than 7 years.
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Old 04-04-2012, 04:44 PM   #4
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Why take a chance when the tires get old?

Aged Tires: A Driving Hazard? | Video - ABC News
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