When To Buy New Tires -

For a stricter safety margin, use a quarter. If Washington's head is fully visible, your tread is below 4/32", and you should plan for a replacement soon.

Most modern tires have built-in "wear bars" in the grooves. When the tread is flush with these bars, the tire is at the 2/32" limit. 2. Monitor the Age of Your Tires when to buy new tires

Tires degrade over time due to environmental exposure, regardless of how much tread is left. How to Buy Tires: A Step-by-Step Guide - US News Cars For a stricter safety margin, use a quarter