The tread on the passenger front tire is worn on the outside. What

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Do I need new tires if the center tread passes the penny test, but the outside and inside treads do not? - Quora

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What's In a Tire U.S. Tire Manufacturers Association

If my car's tires are worn way down on the outside but the rest of the tread is still okay, do they need to be replaced immediately? - Quora

The Real Dangers of Driving with Worn Tires - RNR Tire Express