<human>: How do I know when it is time to get new tires?
<bot>: When your car’s tread depth starts to decrease significantly, it may be time to consider getting new tires. You can check the tread depth by measuring the distance between the tire ridges in millimeters or comparing the thickness of the tread to that of a penny. Additionally, you can look for signs such as vibrations and noise coming from the tires.