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Federal regulations say that you should have your tire tread depth no less than 1/16 or 2/32 of an inch. If you are concerned Pennsylvania has different laws, either look up the vehicle laws online or contact your local Department of Public Safety or Department of Motorized Vehicles and ask for information on tread depth regulations.
Once you know the minimum for your tread depth, you can perform the "penny test". Using a United States penny, place the penny with Abraham's head in the tread. If part of the President's head is covered, then you have a legal amount of tread. If not, it is time to change your tire.

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Q: What tread depth will pass inspection in Pa?
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