Phat chopper The Nehmesis' chunky back tire is the largest ever on a motorcycle. By JOHN GITTELSOHN The Orange County Register Harley-Davidson has ruled the world of choppers seemingly forever. But a bike customized from a Star Cruiser by Yamaha Motor Corp., which has its U.S. headquarters in Cypress, broke the lock. The Nehmesis, built by Sam Nehme, a Florida motorcycle customizer, was the first non-American bike to take the top prize in the American class at the 2006 Biketoberfest Rats Hole in Daytona Beach, Fla. "It was huge," said Nehme, whose chopper will join hundreds of the newest, fastest...