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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.
Use a tread depth gauge, or if you donât happen to have one of those laying around, try the âpenny test.â Insert a penny into the tire tread grooves with Lincolnâs head facing down. If you can see the top of Lincolnâs head, your tires are at 2/32nds of an inch or less of remaining tread. You need new tires immediately!