Various factors, such as maintenance, temperatures, driving speeds, vehicle loading, and road conditions, influence when you need new tires.
Replace your tires when the tread depth is down to 1/8 of an inch (3.2 mm) for the front tires, or 1/16 of an inch (1.6 mm) for a rear tire. Also, you need a new tire if:
| • | 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.
If your vehicle has four-wheel drive, the axle differentials, propshafts, and transfer case may be damaged if tires of different sizes, brands or tread types are installed on the front and rear axles. That damage would not be covered under your warranty.
