What this scammer does is offer to send you a certified check drawn on a U.S. bank that is being sent from someone in the U.S. who owes him money. The check is supposed to be for a few hundred or thousands of dollars more than the bike is worth. Then, he wants you to wire him the difference in Nigeria and to send the bicycle to an address in the U.S. where a "friend" will ship it to him later. I've gotten three or four of these responses to my ads on Rec.bicycles.marketplace, all from different yahoo email addresses. Lou Deeter, Orlando FL