Lateral with Tom Scott cover image

27: Extra-green cat trees

Lateral with Tom Scott

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The American System for Tire Depth

Tire tread is measured using a millimeter depth gauge. The number 8642 isn't an indication marker that we would have ever seen, he says. Tread has a minimum depth and it starts at 8 30 seconds of an inch but as it wears away, you wear down to the six-inch level.

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