- 1). Look for visible tread bars on your tires. Once tires become worn down to at least 1/16 inch, rubber tread bars appear in a straight line across the tire tread. Visible tread bars indicate the need to replace tires.
- 2). Inspect the tires for visible damage. Look for holes, cracks or nails embedded in the tire. Remove any objects stuck in the tire and check for leaks. Listen for a hissing sound. Pour soapy water over the tire and look for bubbles caused by escaping air.
- 3). Insert a Lincoln penny in between the tire tread, headfirst. If you're able to see the top of Lincoln's head, you probably need to replace the tires.
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