Tire facts you can check yourself

Free tools that read the numbers on your tire's sidewall and tell you what they mean.

• How old is my tire, and is it recalled?

  Type the last four digits after DOT. Get the week and year it was made, its age, and the federal recalls that name your tire.

• Tire size calculator

  Diameter, sidewall height and revolutions per mile for any size, and how a new size changes your speedometer.