 Hi, this is Brad Keselowski, driver of NASCAR's number 22 discount tire car. At the track, I have an entire pit crew to ensure my tires are properly maintained. But at home, I do it myself. And it only costs a penny. Here's how to check tires for proper tread. Take a penny, place it in the tire tread to head first. And if you see all of Lincoln's head, it's time to replace that tire. So be tire smart. Take a few minutes every month to properly maintain your tires. A message from the Rubber Manufacturers Association.