How old is too old is an oft-asked question. While the
industry guidelines say six years in use or 10 years from build, your
experience can vary.
The life span you see from any tire can vary greatly
depending on how it is used. For example, counter to common belief, an
infrequently used tire actually lives a harder life than one that is exercised
on a regular basis. Since most people relate tire life to number of miles
driven, this can come as a surprise. However, rubber needs to be exercised to
remain in top condition. Sitting around for extended periods of time, then
being asked to go into full service can result in flatspotting (both temporary
and permanent), as well as cracking.
This is more likely to happen when the tires remain
mounted on a vehicle and sitting idle with the vehicle weight on them, as
opposed to stored off the vehicle. Once you go past either the six years in use
or 10 years from build time frame, it is recommended to have the tires
inspected by a professional to insure they are still safe to be used. It would
be best to have this inspection done at least once a year. More
information on what the industry says about tire aging is available here?
Keep in mind that the in-use time starts as soon as the tire is exposed to the
elements. For example, your under-the-truck-bed mounted spare is considered in
use. Do you have a spare sitting on the back of your Jeep? That's considered in
use, too.
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