Various factors, such as maintenance, temperatures, driving speeds, vehicle
loading, and road conditions, influence when you need new tires.
One way to tell when it is time for new tires is to check the treadwear indicators,
which will appear when your tires have only 1/16 inch (1.6 mm) or less
of tread remaining.
You need a new tire if any of the following statements are true:
| • | You can see the indicators at three or more places around the tire. |
| • | You can see cord or fabric showing through the tire's rubber. |
| • | The tread or sidewall is cracked, cut or snagged deep enough to show cord
or fabric. |
| • | The tire has a bump, bulge or split. |
| • | The tire has a puncture, cut or other damage that cannot be repaired well
because of the size or location of the damage. |
The rubber in tires degrades over time, even if they are not being used. This
is also true for the spare tire, if your vehicle has one. Multiple conditions
affect how fast this aging takes place, including temperatures, loading conditions,
and inflation pressure maintenance. With proper care and maintenance tires will typically
wear out before they degrade due to age. If you are unsure about the need to replace
your tires as they get older, consult the tire manufacturer for more information.
