Tread depth is a vertical measurement from the top of the tire’s rubber to the bottom of its deepest grooves. In America, tread depth is measured in 32nds of an inch, with new tires typically coming with 10/32” or 11/32” tread depths. A new tire features deep grooves that channel water through the tire's tread to provide traction in even the wettest driving conditions. The more worn the tires, the worse they will perform on wet roads. The U.S. Department of Transportation recommends replacing tires when they reach 2/32” of tread depth, with anything below that being considered legally worn out and extremely dangerous. A quick and easy way to check your tread is to use the penny test. Simply place a penny into the tread groove with Lincoln’s head upside down. The tires are completely worn out and need to be replaced immediately if you can see the top of Lincoln's head . To ensure your tires are safe and free of any regular or abnormal wear, be sure to occasionally conduct inspections of your tires. Or better yet, have one of Brickell Honda’s trained professionals do it for you.