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I assume you are going to put the donuts on your car? I all for abusing the safety margins of tire design but I think you may attract some unwanted attention from the police. Also I would do some wet road stopping tests.
I have found that trailer tires have no where near the winter traction of even crappy all season tires and maybe donuts are the same?
I am interested in seeing the difference in rolling resistence though, I would assume donuts are better but by how much?
Ian
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