AKRON, OH—The Goodyear rubber company unveiled a brand new, perfectly round tire Monday, one that it says will replace all its earlier models of oval-shaped tires. "Market research showed that consumers prefer fuel economy and driver control over the comical, boingy-boingy motion of a car on oval tires," said Goodyear representative Arthur Campau. Consumers are cautioned to store the new tires flat against the floor, as they can roll away when standing upright.