Frankie Muniz is back to business.
The “Malcolm in the Middle” alum returned to Instagram with an unexpected video about tire safety Saturday — just one day after revealing he had hit “rock bottom” following a “nightmare” six weeks.
In the clip, the 40-year-old actor demonstrated the “old penny test” by sticking a coin into the tread of a tire to determine whether it needs to be replaced.
“The old penny test still works. Insert a penny into the tread with Lincoln’s head facing down,” he captioned the video.
“If you can see the top of his head, your tread is at (or below) 2/32″ — that’s the legal minimum and a safety problem in rain.”
The actor-tur…
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