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If you drive through thick mud alot, sure.
AFAIK, it's just a way to utilize tire flex to keep the treads clean to keep traction in bad situations. The only time I've heard of people doing it is with off-road tires.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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