ST. LOUIS – Just when we were questioning the value of the American penny, we were reminded about its alternative value of a measuring stick. The old tire tread penny trick!. Before we review the particulars, it’s important to note that for your safety, you should always consult tire professionals about tire safety, including tire wear. However, if you aren’t too sure if you’re tires are lacking in treadwear, Abe Lincoln can be of assistance.