FRESNO, Calif. -- A Southern California man taking part in what is considered one of America's most grueling bicycle rides has been killed after he lost control of his bicycle and hit a tree.Authorities say Nicola Grossi, of La Mesa, was riding downhill on a road near Shaver Lake in Fresno County when he lost control of his bicycle on a curve, went off an embankment and hit the tree around 10:30 a.m.