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Use a tread depth indicator or gauge. You can use a special tread depth indicator or gauge tool to measure your tire's tread. If you don't already own one, the gauge is cheap to purchase from an auto parts dealer and it's easy to use. You may be able to find a downloadable tread depth gauge by searching online.
Regularly inspect the tire tread depth to ensure that adequate tread. remains. Tires have small wear bars molded into the tread grooves. When the tread is worn down to the level of the wear bars (indicating. 1/32 inches of tread remaining), the wear bars become exposed and. the tire should be replaced. Some manufacturers recommend replac-. ing the tire when there are 2/32 or 3/32 inches of tread remaining.