A man rides a bicycle past trees devoid of leaves on a winter day in Beijing December 3, 2007. China's capital, where four million bicycles are stolen every year, is clamping down on bike thieves and trying to end the 'vicious cycle' of the second-hand market months before it hosts the Olympics, state media reported on Monday. China is home to a world-record 470 million bicycles, but theft is widespread with 4,000 people being caught stealing bikes this year in Beijing. Picture taken through a window. REUTERS/David Gray (CHINA)