Soft Demand Goodyear Tire & Rubber Co. tumbled 8.3 percent to $14.01. The largest U.S. tiremaker said it’s experiencing softness in global demand. Sales of replacement tires in North America, where Goodyear got 44 percent of its revenue in 2010, fell about 3 percent in last year’s final quarter, Chief Financial Officer Darren Wells said at an investor conference today in Detroit.