Quote:
Originally Posted by Idle
An actual test under actual driving conditions....
Subject: 123 240d.
Age of spare which had never been on the ground: 21 years.
Condition of spare tire: Brand new. It looked fantastic.
Speed of test: 70 mph. (Yeah, I lived a few blocks from an interstate.)
Miles before it blew out: Six.
This was on a Sunday morning, out in the country when traffic was almost nothing. I pulled over, put on the tire I had switched out, and learned that no matter how great a tire might look age make fools of them all.
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Being that series of car was made from 76 to 85, tire technology has vastly improved since then. A 20 year old tire today is 1997 and will be worlds better than the example car.
Also, you don't know if the example tire was, in the past , bolted to the car and driven low on air. This will cause internal damage that is visible only when removed from the wheel.