 Shares of Goodyear Tire Rubber Co. GT, -1.18 jumped 4.9 toward a two-month high in premarket trading Friday, after the tire maker reported second-quarter profit and sales that rose above expectations. The upbeat results were a welcome relief to investors, as the stock tumbled 9.5 the day first-quarter results were reported, and 27.4 after fourth quarter results, which was the biggest one-day selloff since October 1987. 