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They're still legal on anything, just not cost effective on cars. If done properly and kept inflated they can last almost as long as a new tire.
That video is silly. One scene shows legitimate retreading then the next shows cutting sipes in an old tire.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
-- Benjamin Franklin
lib·er·ty
/ˈlibərdē/
noun
1.
the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views
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