You can check your tire tread depth using a simple penny test or by looking for built-in wear bars on the tire itself.
The penny test involves inserting a penny into the tire's deepest groove with Lincoln's head facing inward. If you can see the top of Lincoln's head, your tread is likely below the recommended minimum depth of 2/32 of an inch. Alternatively, most tires have small raised bars in the grooves; if the tread is level with these wear bars, it's time for new tires.
Tire condition is just one factor in vehicle safety; regular professional inspections are recommended.
What should I look for in a tire deal?
Ensure the deal includes all costs, such as mounting, balancing, and disposal fees. Compare the total price, not just the advertised tire price, and check the tire's manufacturing date to ensure it's not too old.