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NASCAR's tires have no treads so more rubber meets the road. Grip is extremely important for a car that weighs 3,400 pounds, has 770 horsepower and turns going 180 mph, so every available inch of rubber has to be touching the track. Tires had tread until the late 1960s, when it was discovered that slick tires offered greater adhesion. (Don't go putting treadless tires on your Dodge Spirit: Slick tires work only on dry surfaces; if it rains, you ain't moving.)
While the ...