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The claims. Tyre Grip creates a "better grip on snow, ice, and slush" by providing "an adhesive surface that grips the roads." You spray it on tires, and it's supposed to work for up to 50 miles per application. We bought a can for $24.95 (later we saw a newer, blue can for $19.95). A second product, AutoSock, is a cloth and mesh cover you slip over a tire and wheel. It "clings to snow and ice, increasing vehicle traction," and is designed to be used at speeds of 30 mph or less. We paid $99 plus shipping for a pair of AutoSocks. They come in different sizes, to fit most cars.
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The checks. We sprayed Tyre Grip on the tire tread of a Honda Accord's front drive wheels, then did acceleration and braking tests on a snowy road in Vermont. ...